Crystal oscillator circuit
The output part of a power circuit with a temperature characteristic 31 is connected to the power voltage of a CMOS inverter-type oscillator circuit 4 including a crystal vibrator. The power circuit with a temperature characteristic 31 includes an amplifier 2 , a diode 20 and a resistor 11 . The output end V 2 of the amplifier 2 is connected to the anode of the diode 20 . The cathode of the diode 20 is connected to the negative input end V 3 of the amplifier 2 and one end of the resistor 11 , and the other end of the resistor 11 is grounded. To the positive input end V 1 of the amplifier 2 is connected a voltage source 1 with small VCC variations.
1 . A crystal oscillator circuit, comprising:
a CMOS inverter-type oscillator circuit including a crystal vibrator; and
a power circuit for supplying to said CMOS inverter-type oscillator circuit an output voltage having a temperature characteristic compensating for the temperature characteristic of the threshold voltage of said CMOS inverter-type oscillator circuit.
2 . The crystal oscillator circuit according to claim 1 , wherein said power circuit includes a voltage source for supplying a reference voltage to said power circuit.
3 . The crystal oscillator circuit according to claim 2 , wherein said voltage source includes a band gap regulator.
4 . The crystal oscillator circuit according to claim 1 , further comprising:
a regulator circuit for regulating the output voltage of said power circuit.
5 . The crystal oscillator circuit according to claim 2 ,
wherein said power circuit includes:
an amplifier for receiving said reference voltage at the positive input end and supplying an output voltage to said CMOS inverter-type oscillator circuit;
a first diode whose anode is connected to the output end of said amplifier and whose cathode is connected to the negative input end of said amplifier; and
a first resistor connected between the negative input end of said amplifier and a ground.
6 . The crystal oscillator circuit according to claim 2 ,
wherein said power circuit includes:
an amplifier for receiving said reference voltage at the positive input end and supplying an output voltage to said CMOS inverter-type oscillator circuit;
a second diode whose anode is connected to the output end of said amplifier;
a second resistor connected between the cathode of said second diode and the negative input end of said amplifier;
a third resistor connected between the negative input end of said amplifier and a ground; and
a regulator circuit for regulating the output voltage of said power circuit by regulating the resistance value of at least any one of said second resistor and said third resistor.
7 . The crystal oscillator circuit according to claim 2 ,
wherein said power circuit includes:
an amplifier for receiving said reference voltage at the positive input end and supplying an output voltage to said CMOS inverter-type oscillator circuit;
a second resistor whose one end is connected to the output end of said amplifier;
a second diode whose anode is connected to the other end of said second resistor and whose cathode is connected to the negative input end of said amplifier;
a third resistor connected between the negative input end of said amplifier and a ground; and
a regulator circuit for regulating the output voltage of said power circuit by regulating the resistance value of at least any one of said second resistor and said third resistor.
8 . The crystal oscillator circuit according to claim 4 characterized in that regulator circuit includes a storage device capable of writing and reading data.
9 . The crystal oscillator circuit according to claim 6 characterized in that regulator circuit includes a storage device capable of writing and reading data.
10 . The crystal oscillator circuit according to claim 7 characterized in that regulator circuit includes a storage device capable of writing and reading data.