Low-power consumption programmable gain amplifier device

Abstract

The invention discloses a low-power consumption programmable gain amplifier. The low-power consumption programmable gain amplifier comprises a first adder subtracter and a second adder subtracter, wherein the first adder subtracter and the second adder subtracter are used for performing addition and subtraction operations on an input signal and a feedback signal; a direct-current component and a direct-current misalignment voltage can be eliminated after adding and subtracting; the two input ends of a variable gain amplifier are respectively connected with the output ends of the first adder subtracter and the second adder subtracter; the input end of a high-pass filter is connected with the output end of the variable gain amplifier; the two output ends of low-pass filter are respectively connected with the input ends of the first adder subtracter and the second adder subtracter; the input end of the low-pass filter is connected with the output end of the variable gain amplifier; the low-pass filter is used for generating a low-pass off frequency to form a high-pass characteristic in a feedback circuit, so that the direct-current misalignment voltage can be eliminated; and the output end of a digital controller is respectively connected with the input ends of the variable gain amplifier, the high-pass filter and the low-pass filter, and is used for providing digital control signals for the variable gain amplifier, the high-pass filter and the low-pass filter.

Description

technical field [0001] The invention relates to the technical field of gain amplifier devices, in particular to the field of low power consumption programmable gain amplifier integrated circuits. Background technique [0002] Traditional radio receivers are highly dependent on hardware, and there are defects such as long cycle and high cost for hardware platform function expansion and improvement, and poor interoperability and signal adaptability between various communication systems. The emergence of SDR (Software-Defined Radio) overcomes these defects of traditional hardware radio receivers, provides a feasible solution to existing problems, and creates new ideas and methods for the design and implementation of multifunctional radio communication systems. Broad development prospects. SDR can include a variety of standards and modes, such as GSM, TD-SCDMA, WCDMA, CDMA2000, WLAN, etc. These standards have different requirements for bandwidth, gain, noise, linearity, and pow...

AI Technical Summary

Problems solved by technology

DC offset voltage is a serious problem inherent in zero-IF receive mode

In addition, since the above-mentioned standard modes are mostly used in handheld devices, the requirements for power consumption are quite stringent

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