US 12,431,848 B2Granted

Push-pull power amplifier

AssigneeMediaTek Singapore Pte. Ltd.

InventorsDecheng Song, Ee-Sze Khoo, Chee-Lee Heng

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Abstract

A push-pull power amplifier (PA) includes a pair of P-type transistors, a pair of N-type transistors, and a splitter, wherein source terminals of the pair of P-type transistors are coupled to a first reference voltage, source terminals of the pair of N-type transistors are coupled to a second reference voltage, and drain terminals of the pair of P-type transistors and drain terminals of the pair of N-type transistors are coupled to an output port of the push-pull PA. The splitter is arranged to receive a common-mode input pair, and provide two differential output pairs to the pair of P-type transistors and the pair of N-type transistors, wherein one of the two differential output pairs is provided to gate terminals of the pair of P-type transistors, and the other of the two differential output pairs is provided to gate terminals of the pair of N-type transistors.

Claims15

Dependent claims

A push-pull power amplifier (PA), comprising:

a pair of P-type transistors, wherein source terminals of the pair of P-type transistors are coupled to a first reference voltage;
a pair of N-type transistors, wherein source terminals of the pair of N-type transistors are coupled to a second reference voltage, the first reference voltage is higher than the second reference voltage, and drain terminals of the pair of P-type transistors and drain terminals of the pair of N-type transistors are coupled to an output port of the push-pull PA;
a splitter, arranged to receive a common-mode input pair comprising a first common-mode input voltage and a second common-mode input voltage, and provide two differential output pairs to the pair of P-type transistors and the pair of N-type transistors, wherein the first common-mode input voltage is provided to the splitter for biasing one of the two differential output pairs to gate terminals of the pair of P-type transistors, and the second common-mode input voltage is provided to the splitter for biasing the other of the two differential output pairs to gate terminals of the pair of N-type transistors;
and
a diode, coupled between the first reference voltage and the splitter, and arranged to bias the first common-mode input voltage.

2 more elements

A power amplifying method, applied with a push-pull power amplifier (PA), wherein the push-pull PA comprises a pair of P-type transistors, a pair of N-type transistors, a diode, and a splitter;

source terminals of the pair of P-type transistors are coupled to a supply voltage;
source terminals of the pair of N-type transistors are coupled to a ground voltage, and drain terminals of the pair of P-type transistors and drain terminals of the pair of N-type transistors are coupled to an output port of the push-pull PA;
the diode is coupled between the supply voltage and the splitter;
and the power amplifying method comprises:
receiving, by the splitter, a common-mode input pair, wherein the common-mode input pair comprises a first common-mode input voltage and a second common-mode input voltage, and the first common-mode input voltage is biased by the diode;
and
providing, by the splitter, two differential output pairs to the pair of P-type transistors and the pair of N-type transistors, wherein the first common-mode input voltage is provided to the splitter for biasing one of the two differential output pairs to gate terminals of the pair of P-type transistors, and the second common-mode input voltage is provided to the splitter for biasing the other of the two differential output pairs to gate terminals of the pair of N-type transistors.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/984,267Filed 10 Nov 2022 · us provisional application
Priority: 6 Jun 2022
Published: US 2023/0396221 A17 Dec 2023
Granted: 30 Sep 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H03F 1/308
In push-pull amplifiers: using mosfet
H03F 3/265
Push-pull amplifiers; Phase-splitters therefor: with field-effect transistors only
H03F 3/21
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers: with semiconductor devices only
H03F 3/3098
Two power transistors being controlled by the input signal: using a transformer as phase splitter