Variable-gain amplifier
A gain amplifier and variable technology, applied to amplifiers with field effect devices, amplifiers with only semiconductor devices, etc., can solve the problems of small control voltage range, small maximum gain, non-linear relationship, etc., to achieve large dynamic range, The effect of high frequency and low noise
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[0025] The variable gain amplifier proposed by the present invention is described in detail in conjunction with the drawings and embodiments as follows:
[0026] The implementation example of the variable gain amplifier circuit structure implemented by CMOS technology proposed by the present invention image 3 Shown. The external input signals are differentially input radio frequency signals Vin+ and Vin-, DC control voltage signal Vcon and power signal Vdd. Including: three identical cascaded variable gain basic units and control voltage generator two parts. The control voltages Vc0, Vc1, Vc2, and Vc3 generated by the control voltage generator are output to each variable gain basic unit. The specific circuit structure and connection relationship of each part are described in detail as follows:
[0027] The embodiment structure of the variable gain basic unit of the present invention is as attached Figure 4 As shown, there are four groups of degenerate MOS pairs with 4-level stac...
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