Gain programmable radio frequency amplifier

Abstract

The invention discloses a gain programmable radio frequency amplifier, comprising: a band-gap reference which generates a reference current and outputs the reference current to a fixed bias voltage circuit; the fixed bias voltage circuit is used for generating fixed bias voltage required by the current and voltage programmable circuit under the control of the reference current; the current and voltage programmable circuit is used for converting the fixed bias voltage into programmable bias current under the control of the n-bit gain control signal and converting the fixed bias voltage into first programmable bias voltage; the input stage bias mirror image module is used for generating a second programmable bias voltage under the control of the programmable current output by the current and voltage programmable circuit; the input stage is used for completing primary amplification of a radio frequency signal under the control of a second programmable bias voltage; the output stage is used for further amplifying the radio frequency signal amplified by the input stage to obtain a radio frequency output signal under the control of a first programmable bias voltage; and the low-dropout voltage stabilizing circuit is used for generating stable voltage to be supplied to the input stage and the output stage.

Description

technical field [0001] The invention relates to a radio frequency amplifier, in particular to a radio frequency amplifier with programmable gain. Background technique [0002] The amplifier system is a key module of signal reception. High gain determines the sensitivity of receiving the minimum signal, and low gain affects the maximum signal and linearity of reception. Therefore, the programmable design of gain and power consumption is very important for the sensitivity and dynamic range of the receiving system. Therefore, the gain programmable optimization design of the amplifier can improve the system dynamic range, simplify the system design, and reduce the system cost. At the same time, the programmable gain design can optimize the energy efficiency ratio of gain and power consumption, reduce system power consumption, and extend battery life. [0003] Such as figure 1 As shown, a conventional RF amplifier consists of a bandgap reference (BGR) 10 , a bias mirror module ...

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Problems solved by technology

[0004] However, by figure 1 It can be seen that the traditional RF amplifier uses a fixed bias current and voltage circuit, the power consumption is fixed, the gain is fixed, there is no variable gain, and the energy efficiency ratio of power consumption is not adjustable

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