A low-voltage frequency mixer

Abstract

The invention provides a low-voltage CMOS folding co-source co-grid mixer. The mixer includes the following parts: a pair of transconductance poles composed of NMOS tubes, tow pairs of switch poles composed of NMOS tubes, a pair of load poles composed of NMOS, and a current source. In the structure of the mixer circuit, the transconductance poles are connected with the switch poles in a co-source co-grid method. The invention solves the problems of the high power supply high voltage caused by the overlapping of the transconductance poles and the switch poles of the traditional Gilbert mixer, and the compromise design between the high transconductance and the high linearity of the transconductance poles and the low noise of the switch poles. The invention can be used in the application of the deep submicron RF CMOS circuit, in particular in the design developing of the satellite navigation double-system compatible receiver radio frequency integrated circuit. The invention has bright application prospect in both the military and the civilian fields.

Description

technical field [0001] The invention belongs to the field of deep submicron RF CMOS integrated circuits, and in particular relates to a low-voltage CMOS folded cascode mixer. Background technique [0002] The mixer is an important part of the navigation receiver, which is mainly used to realize the frequency conversion. Some performance parameters of the mixer directly affect the performance of the entire navigation receiver, for example: the conversion gain of the mixer determines the influence degree of the post-stage module of the mixer in the navigation receiver to the system performance, the mixer function The reduction of power consumption has an important impact on the reduction of power consumption of the receiver system. The improvement of the linearity of the mixer plays a key role in the improvement of the linearity of the entire receiver. The noise of the mixer also seriously affects the sensitivity of the receiver. Therefore, it is very important to have a mixe...

AI Technical Summary

Problems solved by technology

The transconductance stage of the mixer is connected to the switching stage in a folded cascode manner, and the substrates of all MOS transistors in the circuit are connected to their corresponding sources, which solves the problem of transconductance in standard Gilbert type mixers. The problem of high power supply voltage caused by the stacking of the stage and the switch stage, and the difficulty of the compromise design between the high transconductance and high linearity of the transconductance stage and the low noise of the switch stage; the low-voltage and low-consumption design of the mixer is realized, and it also helps Improvements in conversion gain, power consumption, linearity and noise performance of mixers

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