Low-noise variable-gain mixer

A low-noise, mixer technology, applied in the field of radio frequency integrated circuit design, can solve problems such as poor noise figure of mixers

Active Publication Date: 2012-12-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the noise figure of the traditional mixer is poor and the gain is a fixed value

Method used

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Embodiment Construction

[0018] Combine below Figure 4 The low noise variable gain mixer of the present invention will be further described.

[0019] The low-noise variable-gain mixer of the present invention includes: a low-noise input matching stage circuit, a frequency converting stage circuit, a current splitting stage circuit, a variable load stage circuit, and a gain switching stage circuit. The connections and functions of each part are as follows:

[0020] RF+ and RF- are differential radio frequency input signals, IF+ and IF- are differential intermediate frequency output signals, LO+ and LO- are differential local oscillator input signals, VC is a control port for variable gain, VDD is a power supply, Vb1 and Vb2 are bias Set the port.

[0021] The low-noise input matching stage circuit is a differential input structure, including NMOS transistors MA1, MA2, MA3, MB1, MB2, MB3, capacitors CA1, CA2, CA3, CB1, CB2, CB3, inductors LA1, LB1, the device connection relationship is as follows, di...

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Abstract

The invention provides a low-noise variable-gain mixer relating to an integrated circuit technology of radio-frequency communication. The low-noise variable-gain mixer mainly comprises a low-noise transconductance input stage circuit, a current division stage circuit, a variable load stage circuit, a gain switchover stage circuit and a frequency conversion stage circuit. The switchover of a mixer at two working modes of a high-gain mode and a low-gain mode is realized by a method for judging whether current is provided to a transconductance input stage and a current division stage by a switching control current mirror or not; and moreover, the power consumption can be saved when the mixer works at the low-gain mode. The characteristic of low noise is realized by the circuits of the mixer within the working bandwidth of the circuits of the mixer. Meanwhile, the aim of variable gain is realized. The working bandwidth is 0.7 to 2.85GHz, and the important frequency bands of 915MHz, 1.8GHz, 2.45GHz and the like are covered. The low-noise variable-gain mixer is suitable for being used in a multi-standard wireless communication receiving system. Moreover, the variable-gain mixer provided by the invention can be used for a first-stage circuit of a receiving machine and can also be comprehended as the combination of a low-noise amplifier and a mixer.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuit design, and is applied to the radio frequency front end of a receiver. It is a low-noise mixer suitable for various wireless communication standards, and can switch between high-gain and low-gain modes at the same time. , and can save power consumption in low-gain mode of operation. Background technique [0002] The rapid development of the communication industry has accelerated the design demand for radio frequency integrated circuits. Driven by national demand and market environment, my country's radio frequency integrated circuit technology is making great strides. Transceivers are an integral part of the RF world and their importance cannot be replaced. As an important unit in the receiver, the mixer is one of the important components of the communication system. There are mainly two types of mixers that convert radio frequency signals into intermediate frequency ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
Inventor 刘洋杨帆张小龙吴洪天于奇孙明远
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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