Multistage cascade broadband variable gain amplifier and in-band adjusting method thereof

Abstract

The invention discloses a multi-stage cascaded broadband variable gain amplifier and an in-band adjustment method thereof. A plurality of single-stage variable gain amplifiers are cascaded in the multi-stage cascaded broadband variable gain amplifier; each single-stage variable gain amplifier comprises a first gain amplification unit GM1, a second gain amplification unit GM2, a feedback amplification unit GMf, a first load resistor Ro1, a second load resistor Ro2, a third load resistor Ro3, a fourth load resistor Ro4, a first load capacitor C1, a second load capacitor C2, a third load capacitor C3 and a fourth load capacitor C4. According to the multi-stage cascade broadband variable gain amplifier designed by the invention, a relatively small chip area, low power consumption and low gain error are ensured, and relatively high precision and a relatively large gain range can be achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a multi-stage cascaded broadband variable gain amplifier and an in-band adjustment method thereof. Background technique [0002] In recent years, with the development of big data analysis and artificial intelligence, the bandwidth of received signals has been increasing, and the requirements for signal processing rates have become higher and higher. This requires an automatic gain control (Automatic Generation Control, AGC) amplifier to accommodate a wide range of signal bandwidth, operating frequency and power requirements. Based on different gain tuning mechanisms, variable gain amplifiers in AGC amplifiers can be classified into analog control variable gain amplifiers and digital control variable gain amplifiers. [0003] In the prior art, the programmable gain amplifier is usually designed by combining the active feedback bandwidth expansion technolog...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the programmable gain amplifier is usually designed by combining the active feedback bandwidth expansion technology and the binary weighted switch technology, but the quality factor Q of the programmable gain amplifier designed by this method is relatively large, and the Q value Increasing will result in larger fluctuations in the band

[0004] In addition, if a larger gain control range is required, multiple variable gain amplifiers need to be cascaded, which will further deteriorate the in-band fluctuation of the circuit, which will seriously damage the performance of the amplifier.

Images