Temperature compensation circuit of power amplifier and temperature compensation method

Patent metadata

Field	Value
Publication number	US-12494746-B2
Application number	US-202218064264-A
Country	US
Kind code	B2
Filing date	Dec 10, 2022
Priority date	Jul 6, 2020
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

A temperature compensation circuit is configured to generate a first electrical signal corresponding to the current ambient temperature, use the first electrical signal to adjust a second electrical signal received by an electrical signal input end, and obtain a third electrical signal; and output the third electrical signal to a power control circuit. The power control circuit is configured to convert the third electrical signal into a fourth electrical signal and output the fourth electrical signal to a power amplifier. The fourth electrical signal is used for controlling the gain of the power amplifier to present a preset change rule following a temperature change. Thus, by adding the described temperature compensation circuit in a power amplification circuit, the stability of the gain and the stability of the output power of a power amplifier are ensured, and the performance of the power amplifier is not affected by a change in temperature.

First claim

What is claimed is:

1 . A temperature compensation circuit of a power amplifier (PA), configured to: generate a first electrical signal corresponding to current ambient temperature; adjust, by using the first electrical signal, a second electrical signal received by an electrical signal input end, to obtain a third electrical signal; and output the third electrical signal to a power control circuit which is configured to convert the third electrical signal into a fourth electrical signal and output the fourth electrical signal to the PA,
wherein the fourth electrical signal controls gain of the PA to present a preset variation rule with variation of temperature; wherein the temperature compensation circuit comprises: a current compensation circuit configured to: generate the first electrical signal corresponding to the current ambient temperature; and output the first electrical signal to adjust the second electrical signal, to obtain an intermediate electrical signal, each of the first electrical signal, the second electrical signal and the intermediate electrical signal being a current signal; and a current-to-voltage conversion circuit configured to convert the intermediate electrical signal into the third electrical signal to be output, wherein the third electrical signal is a voltage signal.

2 . The temperature compensation circuit of claim 1 , wherein the current compensation circuit comprises:
a temperature-controlled current source configured to provide a current signal varying with temperature; and a current adjustment circuit configured to adjust the current signal provided by the temperature-controlled current source to the first electrical signal.

3 . The temperature compensation circuit of claim 2 , wherein the current adjustment circuit comprises a steady state current source, a first Field-Effect Transistor (FET) and a second FET,
the steady state current source has an end connected to a first voltage source and another end connected to the temperature-controlled current source, and an intermediate connection node between the steady state current source and the temperature-controlled current source is connected to a gate and a drain of the first FET, the gate of the first FET is connected to a gate of the second FET, a source of the first FET and a source of the second FET are connected to a second voltage source, a drain of the second FET is used as an output end of the current compensation circuit, to output the first electrical signal.

4 . The temperature compensation circuit of claim 1 , wherein the current-to-voltage conversion circuit comprises a first resistor having an end connected to ground and another end connected to an output end of the current compensation circuit and an input end of the power control circuit.

5 . The temperature compensation circuit of claim 4 , wherein the current-to-voltage conversion circuit further comprises a first capacitor connected in parallel with the first resistor.

6 . The temperature compensation circuit of claim 1 , wherein the preset variation rule is that the gain of the PA increases with temperature rising and decreases with temperature dropping.

7 . A temperature compensation circuit of a power amplifier (PA), configured to: generate a first electrical signal corresponding to current ambient temperature; adjust, by using the first electrical signal, a second electrical signal received by an electrical signal input end, to obtain a third electrical signal; and output the third electrical signal to a power control circuit which is configured to convert the third electrical signal into a fourth electrical signal and output the fourth electrical signal to the PA,
wherein the fourth electrical signal controls gain of the PA to present a preset variation rule with variation of temperature; the temperature compensation circuit being a voltage compensation circuit which comprises: a temperature-controlled voltage source configured to provide a voltage signal varying with temperature; and a voltage adjustment circuit configured to adjust the voltage signal provided by the temperature-controlled voltage source to the first electrical signal, each of the first electrical signal and the second electrical signal being a voltage signal.

8 . The temperature compensation circuit of claim 1 , wherein the power control circuit comprises at least a Low Dropout Regulator (LDO) having a forward input end used as an input end of the power control circuit to receive the third electrical signal.

9 . A temperature compensation method of a power amplifier (PA), comprising:
generating, by controlling a temperature compensation circuit, a first electrical signal corresponding to current ambient temperature; adjusting a second electrical signal by using the first electrical signal, to obtain a third electrical signal; converting, by controlling a power control circuit, the third electrical signal into a fourth electrical signal, and outputting the fourth electrical signal to the PA; and controlling, by using the fourth electrical signal, gain of the PA to present a preset variation rule with variation of temperature; the method further comprising: providing a voltage signal varying with temperature; and adjusting the voltage signal provided by a temperature-controlled voltage source to the first electrical signal, each of the first electrical signal and the second electrical signal being a voltage signal.

Assignees

• Smarter Microelectronics Guang Zhou Co Ltd

Inventors

• Su Qiang
• Li Yongle

Classifications

• H03F2200/447

  the amplifier being protected to temperature influence · CPC title

• H03F3/21

  with semiconductor devices only {(H03F3/245 takes precedence)} · CPC title

• H03F3/195

  in integrated circuits · CPC title

• H03F1/301 Primary

  in MOSFET amplifiers (H03F1/303, H03F1/305, H03F1/308 take precedence) · CPC title