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US 10,476,451 B2Granted
Class-F power amplifier matching network
AssigneeMediatek Inc.
InventorsXiaochuan Guo, Jenwei Ko, Wen-Chang Lee, Changhua Cao, Caiyi Wang
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Abstract
A class-F power amplifier (PA) with a matching network is disclosed herein. The class-F PA comprises a first switch and a second switch operating in differential mode, with a second harmonic trap circuitry selectively terminating the drain terminals to ground at a second harmonic frequency. The second harmonic trap circuitry comprises a plurality of lumped inductive and capacitive components. The PA further comprises a common mode trap and a matching network to reduce the imbalance of the drain terminal impedance between first harmonics and third harmonics.
Claims17
A power amplifier comprising:
- a first switch comprising a first drain terminal;
- a second switch comprising a second drain terminal, wherein the first switch and the second switch are configured to receive differential signals representing an input signal, the input signal having a first harmonic frequency (fH1), a second harmonic frequency (fH2) and a third harmonic frequency (fH3);
- a second harmonic trap circuitry configured to be coupled to the first drain terminal and the second drain terminal, and configured to have a first impedance between the first drain terminal and a common voltage at the second harmonic frequency, and a second impedance between the first drain terminal and the common voltage at the third harmonic frequency, wherein the first impedance is smaller than the second impedance, and wherein
- the second harmonic trap circuitry comprises a plurality of lumped inductive and capacitive components;
- a pair of differential output terminals coupled to the first and second drain terminals;
- and
- a common mode trap circuitry coupled between the pair of differential output terminals, wherein the common mode trap circuitry having a first circuit path in parallel with a second circuit path, wherein the first circuit path comprises inductive and capacitive components configured to short a common mode signal at the pair of differential output terminals to the common voltage at the first harmonic frequency, and the second circuit path comprises inductive and capacitive components configured to short the common mode signal at the pair of differential output terminals to the common voltage at the third harmonic frequency.
4 more elements
A power amplifier comprising:
- a first switch and a second switch configured to receive differential signals representing an input signal, the input signal having a first harmonic frequency (fH1), a second harmonic frequency (fH2) and a third harmonic frequency (fH3);
- a lumped component circuit configured to be coupled between a first drain terminal of the first switch and a second drain terminal of the second switch, the lumped component circuit having inductive components sized to resonate at the second harmonic frequency and configured to short the first drain terminal and the second drain terminal to a common voltage at the second harmonic frequency;
- a pair of differential output terminals coupled to the first and second drain terminals;
- a matching network coupled between the pair of differential output terminals, the matching network having a single-ended output coupled to a load resistance, wherein the matching network is configured to match an impedance between the pair of differential output terminals and the load resistance, wherein:
- the matching network comprises a first matching capacitor coupled between the single-ended output and a first differential output terminal of the pair of differential output terminals;
- a second matching capacitor coupled between a second differential output terminal of the pair of differential output terminals and a second node;
- a first matching inductor coupled between the first differential output terminal and the second node;
- a second matching inductor coupled between the second differential output terminal and the single-ended output;
- and
- a ground network coupled between the common voltage and the second node, wherein the second node is connected to a terminal of a capacitor and a terminal of an inductor and wherein the ground network is configured to have a first ground network impedance at the first harmonic frequency, and a second ground network impedance at the third harmonic frequency different from the first ground network impedance.
7 more elements
A power amplifier comprising:
- a first switch and a second switch configured to receive differential signals representing an input signal, the input signal having a first harmonic frequency (fH), a second harmonic frequency (fH2) and a third harmonic frequency (fH3);
- a lumped component circuit configured to be coupled between a first drain terminal of the first switch and a second drain terminal of the second switch, the lumped component circuit having inductive components sized to resonate at the second harmonic frequency and configured to short the first drain terminal and the second drain terminal to a common voltage at the second harmonic frequency;
- a pair of differential output terminals coupled to the first and second drain terminals;
- and
- a matching network coupled between the pair of differential output terminals, the matching network having a single-ended output coupled to a load resistance, wherein the matching network is configured to match an impedance between the pair of differential output terminals and the load resistance, wherein:
- the matching network comprises a transformer with a primary coil coupled between the pair of differential output terminals and a secondary coil coupled between a terminal of the load resistance and the common voltage.
3 more elements
Dependencies are inferred from the claim text.