A CMOS Quadrature Mixer Circuit with Gain Varying Positively with Temperature

Abstract

The invention relates to a CMOS (complementary metal-oxide-semiconductor) quadrature mixer circuit with gain changing with the temperature positive slope. The circuit comprises a quadrature mixer circuit body structure based on a Gilbert unit, a switching control negative feedback circuit and an adaptive temperature control circuit, wherein the switching control negative feedback circuit is connected with the quadrature mixer circuit body structure, and the adaptive temperature control circuit is connected with the switching control negative feedback circuit. According to the circuit, temperature information on a sampling sheet is acquired in real time according to the working temperature, the magnitude of source negative feedback of a quadrature mixer is changed by the adaptive temperature control circuit, and the conversion gain of the quadrature mixer is changed accordingly; when the working temperature rises, equivalent resistance of the source negative feedback is gradually decreased by the adaptive temperature control circuit, and on the basis of compensating the reduced gain caused by reduction of the circuit equivalent transconductance with temperature rising, the mixer gain is further increased with the temperature rising, that is, the gain changes with the temperature positive slope, so that the gain reduced due to rising of the working temperature in a radio frequency circuit and a system is effectively compensated.

Description

Technical field: [0001] The invention relates to the technical field of Gilbert quadrature mixers, in particular to a CMOS quadrature mixer circuit suitable for various types of heterodyne radio transceiver radio frequency circuits whose gain varies with positive temperature slope. Background technique: [0002] As consumer electronic products represented by handheld devices have increasingly tight volume and cost requirements, Si CMOS technology is increasingly used in the design of radio frequency integrated circuits. Using CMOS technology to design the basic circuit units of the RF transceiver front end, such as: low noise amplifier, mixer, intermediate frequency amplifier, variable gain amplifier, etc., its equivalent voltage gain can generally be expressed as: [0003] G=A·g m_eff ·Z L [0004] Among them, A is a coefficient related to the circuit type, for example, A is generally 1 in an amplifier circuit, and A is generally 2 / π in a Gilbert mixer circuit; g m_eff ...

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Problems solved by technology

[0013] The purpose of the present invention is to solve the problem that the gain of the CMOS radio frequency transceiver front-end circuit decreases as the temperature rises, and overcomes the shortcomings of conventional methods such as complex compensation circuits, deterioration of noise performance, increased power consumption, and affecting the operating bandwidth of the circuit. Based on the Gilbert quadrature mixer, a temperature-adaptive source-level negative feedback technology is proposed, and a circuit structure is designed that is simple and does not affect the noise performance of the circuit. The power consumption of the compensation circuit is small, and it can be used in a wide range The CMOS quadrature mixer circuit that realizes the positive slope change of the gain with the temperature in the temperature working range is suitable for all kinds of heterodyne radio transceiver RF circuits, and can perform gain compensation for the transceiver front-end system when working at a wide temperature

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