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Bias circuit

A bias circuit and circuit technology, applied in the direction of amplifier protection circuit layout, electrical components, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems affecting the stability of bias signals, power changes, and thermal runaway of transistors, etc.

Active Publication Date: 2019-12-24
RICHWAVE TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the environment of wireless communication may change at any time, the power of the radio frequency (Radio Frequency, RF) signal may also change accordingly
When the power of the modulated RF signal on the RF signal path exceeds a specific power value instantaneously, the bias signal provided by the bias circuit to the RF signal path will also fluctuate, thereby reducing the stability of the bias signal , will also degrade the linearity and performance of amplifiers placed on the RF signal path
[0004] In addition, the temperature change caused by the self-heating of the amplifier will also affect the stability of the bias signal, resulting in changes in the performance of the amplifier, and even damage to the amplifier and / or thermal runaway of transistors in the amplifier. )

Method used

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Embodiment Construction

[0042] figure 1 is a schematic diagram of a bias circuit 100 according to an embodiment of the present invention. In some embodiments, the bias circuit 100 can be used to provide the bias signal SIG BIAS to the RF signal path, so that the amplifier A1 placed on the RF signal path can operate at an appropriate bias and amplify the RF signal SIG RF . In some embodiments, the radio frequency signal SIG RF Can be an AC signal. However, in some other embodiments, the bias circuit 100 can also be applied to other types of circuits according to requirements, so as to provide the bias signal SIG BIAS . The bias circuit 100 includes a current sensor 110 , a transistor M1A and a low-pass filter circuit 120 .

[0043] The current sensor 110 has a first terminal and a second terminal, and the first terminal of the current sensor 110 is coupled to the voltage terminal NV1 to receive the voltage V1.

[0044] The transistor M1A has a first terminal, a second terminal and a control ter...

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Abstract

A bias circuit includes a current sensor, a transistor, and a low pass filter circuit. The current sensor has a first terminal coupled to a voltage terminal, and a second terminal. The transistor hasa first terminal coupled to the second terminal of the current sensor, a second terminal coupled to a radio frequency signal path for providing a bias signal, and a control terminal for receiving a reference voltage. The low pass filter circuit is coupled between the second terminal of the current sensor and the control terminal of the transistor.

Description

technical field [0001] The present invention relates to a bias circuit, in particular to a bias circuit with a feedback path to reduce fluctuations in bias signals. Background technique [0002] In wireless communication, amplifiers are often used to amplify signals when sending and receiving signals to improve the quality of communication signals. [0003] However, since the environment of the wireless communication may change at any time, the power of a radio frequency (Radio Frequency, RF) signal may also change accordingly. When the power of the modulated RF signal on the RF signal path exceeds a specific power value instantaneously, the bias signal provided by the bias circuit to the RF signal path will also fluctuate, thereby reducing the stability of the bias signal , will also reduce the linearity and performance of the amplifier disposed on the radio frequency signal path. [0004] In addition, the temperature change caused by the self-heating of the amplifier wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/52H03F1/02H03F3/24
CPCH03F1/52H03F1/02H03F3/24H03F1/302H03F3/245H03F3/19H03F2200/451H03F1/30H03F3/20H03F1/32
Inventor 王一峰
Owner RICHWAVE TECH CORP
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