Doherty power amplifier and electronic device including it in wireless communication system
An electronic device including a Doherty power amplifier is provided. The electronic device includes a carrier amplifier, a first circuit coupled to an output terminal of the carrier amplifier, a peaking amplifier, a second circuit coupled to an output terminal of the peaking amplifier, and a network circuit. The network circuit includes the Doherty power amplifier and a transmission line for impedance matching with a resonance circuit. The resonance circuit may be disposed between a first area and a second area of the transmission line. The Doherty power amplifier provides an output impedance in a first range distributed based on a frequency within a bandwidth. The network circuit provides a load impedance in a second range distributed based on the frequency within the bandwidth. The first area of the transmission line provides a first phase shift impedance. The second area of the transmission line provides a second phase shift impedance.
1 . An electronic device including a doherty power amplifier, the electronic device comprising:
a carrier amplifier;
a first circuit connected to the carrier amplifier;
a peaking amplifier;
a second circuit connected to the peaking amplifier; and
a network circuit,
wherein the network circuit includes a first transmission line connected to an output terminal of the first circuit and the second circuit, a second transmission line, and a resonance circuit;
disposed between the first transmission line and the second transmission line,
wherein an output impedance from the network circuit to the output terminal of the first circuit and the second circuit depends on a frequency within a bandwidth,
wherein the resonance circuit is used to change a load impedance from the output terminal of the first circuit and the second circuit to the network circuit in accordance with a frequency within the bandwidth,
wherein an electrical length of the first transmission line is used to
provide values of the load impedance over frequencies within the bandwidth; corresponding to values of the output impedance over the frequencies within the bandwidth.
2 . The electronic device of claim 1 , wherein the resonance circuit includes a third transmission line composed of a short circuit and a fourth transmission line composed of an open circuit.
3 . The electronic device of claim 1 , wherein the resonance circuit includes an inductor and a capacitor connected in series.
4 . The electronic device of claim 1 , wherein the resonance circuit includes an inductor and a capacitor connected in parallel.
5 . The electronic device of claim 1 , wherein the first transmission line is a microstrip.
6 . The electronic device of claim 1 , wherein the first transmission line includes capacitors and inductors arranged in a π-type.
7 . The electronic device of claim 1 , wherein the first transmission line includes capacitors and inductors arranged in a T-type.
8 . The electronic device of claim 1 , wherein a sum of a value of the electrical length of the first transmission line and a value of an electrical length of the second transmission line is 90 degrees.
9 . The electronic device of claim 1 , wherein a value in accordance with a corresponding frequency within the bandwidth from among the values of the load impedance is complex conjugate of a value in accordance with the corresponding frequency within the bandwidth among the values of the output impedance.
10 . The electronic device of claim 1 , wherein the second transmission line is a microstrip.
11 . A radio frequency integrated circuit (RFIC) in a wireless communication system, the RFIC comprising:
a plurality of radio frequency (RF) processing chains,
wherein each of the plurality of RF processing chains includes a phase shifter and a doherty power amplifier,
wherein the doherty power amplifier includes:
a carrier amplifier,
a first circuit connected to the carrier amplifier,
a peaking amplifier,
a second circuit connected to the peaking
amplifier, and
a network circuit,
wherein the network circuit includes a first transmission line connected to an output terminal of the first circuit and the second circuit, a second transmission line, and a resonance circuit
disposed between the first transmission line and the second transmission line,
wherein an output impedance from the network circuit to the output terminal of the first circuit and the second circuit depends on a frequency within a bandwidth,
wherein the resonance circuit is used to change a load impedance from the output terminal of the first circuit and the second circuit to the network circuit in accordance with a frequency within the bandwidth,
wherein an electrical length of the first transmission line is used to provide values of the load impedance over frequencies within the bandwidth corresponding to values of the output impedance over the frequencies within the bandwidth.
12 . The RFIC of claim 11 , wherein the resonance circuit includes a third transmission line composed of a short circuit and a fourth transmission line composed of an open circuit.
13 . The RFIC of claim 11 , wherein the resonance circuit includes an inductor and a capacitor connected in series.
14 . The RFIC of claim 11 , wherein the resonance circuit includes an inductor and a capacitor connected in parallel.
15 . The RFIC of claim 11 , wherein the first transmission line is a microstrip.
16 . The RFIC of claim 11 , wherein the first transmission line includes capacitors and inductors arranged in a π-shape.
17 . The RFIC of claim 11 , wherein the first transmission line includes capacitors and inductors arranged in a T-type.
18 . The RFIC of claim 11 , wherein a sum of a value of the electrical length of the first transmission line and a value of an electrical length of the second transmission line is 90 degrees.
19 . The RFIC of claim 18 , wherein a value in accordance with a corresponding frequency within the bandwidth from among the values of the load impedance is complex conjugate of a value in accordance with the corresponding frequency within the bandwidth among the values of the output impedance.
20 . The RFIC of claim 11 ,
wherein the second transmission line is a microstrip.