Semiconductor integrated circuit device and high frequency power amplifier module
View Patent ↗In a SPDT switch, a resistor for leak path is connected between a terminal for antenna and a reference potential. The resistor for leak path allows charge capacitances accumulated in electrostatic capacitor elements provided as DC cut capacitors connected to transmission signal terminals and reception signal terminals to be discharged and allows rapid lowering of a potential at the terminal for antenna. In the SPDT switch, a switching characteristic is improved and a delay in the rising edge of a low-power slot which comes after a high-power slot is reduced.
1. A semiconductor integrated circuit device used in mobile communication equipment, said semiconductor integrated circuit device comprising:
a first terminal coupled to an antenna;
a second terminal coupled to a signal processing circuit;
a switching transistor disposed between said first and second terminals to switch a connection between said first and second terminals;
a third terminal coupled to a control circuit for generating a control signal for said switching transistor;
a voltage booster circuit which latches a transmission signal outputted via said switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said switching transistor; and
a resistor for a leak path connected between said first terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first to third terminals.
2. A semiconductor integrated circuit device according to claim 1 , wherein a resistance value of said resistor for a leak path is not less than 100 KΩ.
3. A semiconductor integrated circuit device used in mobile communication equipment, said semiconductor integrated circuit device comprising:
a first terminal coupled to an antenna;
a first transmission terminal coupled to a first transmission circuit;
a second transmission terminal coupled to a second transmission circuit;
a reception terminal coupled to a reception circuit;
a first switching transistor disposed between said first terminal and said first transmission terminal to switch a connection between said first terminal and said first transmission terminal;
a second switching transistor disposed between said first terminal and said second transmission terminal to switch a connection between said first terminal and said second transmission terminal;
a third switching transistor disposed between said first terminal and said reception terminal to switch a connection between said first terminal and said reception terminal;
a third terminal coupled to a control circuit for generating a control signal for each of said first and second switching transistors;
a voltage booster circuit which latches a transmission signal outputted via said first or second switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said first or second switching transistor; and
a resistor for a leak path connected between said second transmission terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first and third terminals, said first and second transmission terminals, and said reception terminal.
4. A semiconductor integrated circuit device according to claim 3 ,
wherein a GSM transmission signal inputted to said first transmission circuit is inputted to said first transmission terminal, and
wherein a POS transmission signal inputted to said second transmission circuit is inputted to said second transmission terminal.
5. A semiconductor integrated circuit device used in mobile communication equipment, said semiconductor integrated circuit device comprising:
a first terminal coupled to an antenna;
a transmission terminal coupled to a transmission circuit;
a plurality of reception terminals each coupled to a reception circuit;
a transmission switching transistor disposed between said first terminal and said transmission terminal to switch a connection between said first terminal and said transmission terminal;
a reception switching transistor disposed between said first terminal and each of said plurality of reception terminals to switch a connection between said first terminal and each of said plurality of reception terminals;
a third terminal coupled to a control circuit for generating a control signal for said transmission switching transistor;
a voltage booster circuit which latches a transmission signal outputted via said transmission switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said transmission switching transistor; and
a resistor for a leak path connected between any one of said plurality of reception terminals and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first terminal, said transmission terminal, and said reception terminal.
6. A semiconductor integrated circuit device used in mobile communication equipment, said semiconductor integrated circuit device comprising:
a first terminal coupled to an antenna;
a first transmission terminal coupled to a first transmission circuit;
a second transmission terminal coupled to a second transmission circuit;
a reception terminal coupled to a reception circuit;
a first switching transistor disposed between said first terminal and said first transmission terminal to switch a connection between said first terminal and said first transmission terminal;
a second switching transistor disposed between said first terminal and said second transmission terminal to switch a connection between said first terminal and said second transmission terminal;
a third switching transistor disposed between said first terminal and said reception terminal to switch a connection between said first terminal and said reception terminal;
a third terminal coupled to a control circuit for generating a control signal for each of said first and second switching transistors;
a voltage booster circuit which latches a transmission signal outputted via said first or second switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said first or second switching transistor; and
a resistor for a leak path connected between said first transmission terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first and third terminals, said first and second transmission terminals, and said reception terminal.
7. A semiconductor integrated circuit device according to claim 6 ,
wherein a GSM transmission signal inputted to said first transmission circuit is inputted to said first transmission terminal, and
wherein a PCS transmission signal inputted to said second transmission circuit is inputted to said second transmission terminal.
8. A semiconductor integrated circuit device used in mobile communication equipment, said semiconductor integrated circuit device comprising:
a first terminal coupled to an antenna;
a transmission terminal coupled to a transmission circuit;
a plurality of reception terminals each coupled to a reception circuit;
a transmission switching transistor disposed between said first terminal and said transmission terminal to switch a connection between said first terminal and said transmission terminal;
a first reception switching transistor connected to said first terminal to switch a connection of said first terminal;
a second reception switching transistor connected between said first reception switching transistor and each of said plurality of reception terminals to switch a connection of each of said plurality of reception terminals;
a third terminal coupled to a control circuit for generating a control signal for said transmission switching transistor;
a voltage booster circuit which latches a transmission signal outputted via said transmission switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said transmission switching transistor; and
a resistor for a leak path connected between a reference potential and a connecting portion between said first reception switching transistor and any of said plurality of second reception switching transistors to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first terminal, said transmission terminal, and said plurality of reception terminals.
9. A high frequency power amplifier module comprising:
an antenna connection switching circuit; and
a high frequency power amplifier which receives a transmission signal from a transmission circuit, amplifies the transmission signal, and supplies the amplified transmission signal to said antenna connection switching circuit,
wherein said antenna connection switching circuit comprises:
a first terminal coupled to an antenna;
a transmission terminal coupled to the high frequency power amplifier;
a reception terminal coupled to a reception circuit;
a switching transistor disposed between said first terminal and said transmission terminal to switch a connection between said first terminal and said transmission terminal;
a third terminal coupled to a control circuit for generating a control signal for said switching transistor;
a voltage booster circuit which latches the transmission signal outputted via said switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said first switching transistor; and
a resistor for a leak path connected between said first terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first to third terminals.
10. A high frequency power amplifier module according to claim 9 , wherein a resistance value of said resistor for a leak path is not less than 100 KΩ.
11. A high frequency power amplifier module comprising:
an antenna connection switching circuit; and
high frequency power amplifiers which receive respective transmission signals from first and second transmission circuits, amplify the transmission signals, and supply the amplified transmission signals to said antenna connection switching circuit,
wherein said antenna connection switching circuit comprises:
a first terminal coupled to an antenna;
first and second transmission terminals coupled to said high frequency power amplifiers;
a reception terminal coupled to a reception circuit;
a first switching transistor disposed between said first terminal and said first transmission terminal to switch a connection between said first terminal and said first transmission terminal;
a second switching transistor disposed between said first terminal and said second transmission terminal to switch a connection between said first terminal and said second transmission terminal;
a third switching transistor disposed between said first terminal and said reception terminal to switch a connection between said first terminal and said reception terminal;
a third terminal coupled to a control circuit for generating a control signal for each of said first and second switching transistors;
a voltage booster circuit which latches the transmission signal outputted via said first or second switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said first or second switching transistor; and
a resistor for a leak path connected between said second transmission terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first and third terminals, said first and second transmission terminals, and said reception terminal.
12. A high frequency power amplifier module according to claim 11 ,
wherein the high frequency power amplifier connected to said first transmission terminal outputs a GSM transmission signal, and
wherein the high frequency power amplifier connected to said second transmission terminal outputs a PCS transmission signal.
13. A high frequency power amplifier module comprising:
an antenna connection switching circuit; and
a high frequency power amplifier which receives a transmission signal from each of first and second transmission circuits, amplifies the transmission signal, and supplies the amplified transmission signal to said antenna connection switching circuit,
wherein said antenna connection switching circuit comprises:
a first terminal coupled to an antenna;
a transmission terminal coupled to said high frequency power amplifier;
a plurality of reception terminals each coupled to a reception circuit;
a transmission switching transistor disposed between said first terminal and said transmission terminal to switch a connection between said first terminal and said transmission terminal;
a reception switching transistor disposed between said first terminal and each of said plurality of reception terminals to switch a connection between said first terminal and each of said reception terminals;
a third terminal coupled to a control circuit for generating a control signal for said transmission switching transistor;
a voltage booster circuit which latches the transmission signal outputted via said transmission switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said transmission switching transistor; and
a resistor for a leak path connected between any one of said plurality of reception terminals and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first terminal, said transmission terminal, and said reception terminal.
14. A high frequency power amplifier module comprising:
an antenna connection switching circuit; and
high frequency power amplifiers which receive respective transmission signals from first and second transmission circuits, amplify the transmission signals, and supply the amplified transmission signals to said antenna connection switching circuit,
wherein said antenna connection switching circuit comprises:
a first terminal coupled to an antenna;
first and second transmission terminals coupled to said high frequency power amplifiers;
a reception terminal coupled to a reception circuit;
a first switching transistor disposed between said first terminal and said first transmission terminal to switch a connection between said first terminal and said first transmission terminal;
a second switching transistor disposed between said first terminal and said second transmission terminal to switch a connection between said first terminal and said second transmission terminal;
a third switching transistor disposed between said first terminal and said reception terminal to switch a connection between said first terminal and said reception terminal;
a third terminal coupled to a control circuit for generating a control signal for each of said first and second switching transistors;
a voltage booster circuit which latches the transmission signal outputted via said first or second switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said first or second switching transistor; and
a resistor for a leak path connected between said first transmission terminal and a reference potential to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected individually to said first and third terminals, said first and second transmission terminals, and said reception terminal.
15. A high frequency power amplifier module according to claim 14 ,
wherein the high frequency power amplifier connected to said first transmission terminal outputs a GSM transmission signal, and
wherein the high frequency power amplifier connected to said second transmission terminal outputs a PCS transmission signal.
16. A high frequency power amplifier module comprising:
an antenna connection switching circuit; and
a high frequency power amplifier which receives a transmission signal from each of first and second transmission circuits, amplifies the transmission signal, and supplies the amplified transmission signal to said antenna connection switching circuit,
wherein said antenna connection switching circuit comprises:
a first terminal coupled to an antenna;
a transmission terminal coupled to said high frequency power amplifier;
a plurality of reception terminals each coupled to a reception circuit;
a transmission switching transistor disposed between said first terminal and said transmission terminal to switch a connection between said first terminal and said transmission terminal;
a first reception switching transistor connected to said first terminal to switch a connection of said first terminal;
a plurality of second reception switching transistors connected between said first reception switching transistor and each of said plurality of respective reception terminals to switch a connection of each of said plurality of reception terminals;
a third terminal coupled to a control circuit for generating a control signal for said transmission switching transistor;
a voltage booster circuit which latches the transmission signal outputted via said transmission switching transistor when the control signal is inputted via said third terminal, generates a boosted voltage higher than a voltage level of the control signal, and applies the boosted voltage to a control terminal of said transmission switching transistor; and
a resistor for a leak path connected between a reference potential and a connecting portion between said first reception switching transistor and any of said plurality of second reception switching transistors to discharge charge capacitances accumulated in electrostatic capacitor elements as DC cut capacitors connected to said first terminal, said transmission terminal, and said plurality of reception terminals.