Adjustable negative resistance structure-based multimode multi-channel mixer
A mixer, multi-channel technology, applied in the field of multi-mode multi-channel mixer, multi-mode multi-channel broadband communication system, can solve the problems of poor isolation of adjacent channels, poor noise performance, increased layout area, etc. The effect of reducing flicker noise, good noise performance, and increasing conversion gain
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[0025] figure 1 In the traditional mixer structure, two PMOS tubes are used to reduce the direct current of the turn-off tube to reduce the flicker noise of the variable frequency output, and to reduce the turn-off time of the turn-off tube. Capacitors C3 and C4 are for the circuit's working frequency to resonate with the inductors L1 and L2 at the working frequency. Take the working frequency of 2GHz as an example.
[0026] The gain A of the traditional mixer can be estimated by the following formula:
[0027] A ≈ 2 π g m 1 R L
[0028] Where g m1 Is the transconductance of the RF input tube, R L Is the output load.
[0029] Such as figure 2 As shown, the specific embodiment of the present invention provides a variable operating frequency mixer based on a controllable negative resistance structure, including: a radio frequency input circuit, an adjustable negative resistance circuit, a digitally controlled capacitor array circuit and a double-balanced ...
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