Dual-control bit type variable gain amplifier adopting compensation capacitance technology

Abstract

The invention belongs to the field of radio frequency integrated circuits, and particularly provides a dual-control bit type variable gain amplifier adopting a compensation capacitance technology, which is used for solving the problem of how to realize gain adjustment of low phase error in a broadband range. The invention is realized based on a differential cascode type circuit structure, and comprises a differential cascode structure amplifier and a matching network, a compensation capacitor Ccomp is introduced between a source electrode and a drain electrode of common-gate tubes (M2 and M4) of a single-stage circuit, so that the source-drain capacitance Cds2 (Cds2 + Ccomp) of the compensated common-gate tubes is the same as the gate-drain capacitance (Cgd1) of a common-source tube, and a compensation inductor Lcomp to the ground is introduced into an intermediate node of the common-source and common-gate tubes (M1/M2 and M3/M4) of the single-stage circuit, so that the total capacitance of the node is counteracted; and finally, the effects of adjustable gain and invariable phase are achieved, namely, gain adjustment of low phase error in a broadband range is realized.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and specifically provides a dual-control-bit variable gain amplifier adopting compensation capacitance technology, which has the characteristics of wide bandwidth and low phase error. Background technique [0002] The millimeter wave band (30-300GHz) has abundant spectrum resources, which can provide the required frequencies for 5G. With the continuous development of process technology and the improvement of transistor performance, people have been actively researching millimeter wave ( mm-wave) frequency band circuit structure and design technology. [0003] In various types of circuit blocks, variable gain amplifiers (VGAs) control transconductance, cause gain changes, and play an important role in various mmWave band applications; for example, VGAs are used in beamforming or beamforming systems, to To reduce gain error and side lobe level, VGA is used in dynamic polarization...

AI Technical Summary

Problems solved by technology

Recently, with the increasing demand for Gb / s-level high data rate applications, circuit design engineers have developed wideband VGAs with various structures, but how to achieve low phase error gain adjustment in a wide frequency range is still a problem that needs to be solved. big problem

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