Low-power-consumption high-gain broadband frequency mixer

Abstract

The invention discloses a low-power-consumption high-gain broadband frequency mixer which adopts a basic structure of a Gilbert frequency mixer and is provided with a radio-frequency balun, a local oscillator balun, a transconductance unit, a switch unit and a load unit provided with a differential inductor and connected with a load-end parasitic capacitor in parallel, wherein the radio-frequency balun is used for converting an input radio-frequency single-ended signal into a differential signal and outputting the differential signal to the transconductance unit; the transconductance unit is used for converting a radio-frequency voltage signal into a radio-frequency current and inputting the radio-frequency current to the switch unit; the local oscillator balun is used for converting an input local oscillator single-ended signal into a differential signal and outputting the differential signal to the switch unit; the switch unit is used for multiplying the input radio-frequency differential signal by the input local oscillator differential signal and outputting a medium-frequency differential signal through the load unit provided with the differential inductor and connected with the load-end parasitic capacitor in parallel. The low-power-consumption high-gain broadband frequency mixer is characterized in that a positive feedback unit, an LCR resonance unit and a buffer unit are additionally arranged behind the switch unit and form a new load unit with the load unit provided with the differential inductor and connected with the parasitic capacitor in parallel; a final medium-frequency differential signal is output by the buffer unit.

Description

technical field [0001] The invention relates to a mixer in a millimeter-wave circuit, especially a low-power high-gain broadband mixer, which adopts MOS technology and has great advantages in a millimeter-wave circuit. The design structure is simple, and the mixer can be simultaneously Obtain high gain and broadband characteristics, and can greatly reduce the power consumption of the mixer while having the same gain and bandwidth performance as the traditional mixer. Background technique [0002] In 1968, BarrieGilbert proposed the Gilbert double-balanced multiplier structure for the first time, and it was widely used in mixers (hereinafter referred to as "Gilbert mixer"). The circuit block diagram and circuit principle are as follows figure 1 , figure 2 As shown, the radio frequency signal RF converts the single-ended signal into differential signals RF+ and RF- through the balun, and connects the gates of the common source structure MOS transistors M1 and M2 of the trans...

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Problems solved by technology

When using a tuned load, the limited Q value of the inductance unit and the limited output resistance of the switch stage restrict the reduction of the load conductance, which is an important reason why the traditional structure cannot increase the gain; ②The bandwidth of the traditional Gilbert mixer is narrow The main reason is that the susceptance component of the tuned load increases too fast at the frequency away from the resonance point, so that the voltage generated by the current on the load drops rapidly as the frequency deviates from the resonance point; ③ By increasing the Q value of the load inductance, the frequency mixing The gain and bandwidth of the device cannot be improved at the same time, and the gain and bandwidth are often contradictory, so a trade-off is required

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