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Current multiplying self-biasing current multiplexing passive frequency mixer

A passive mixer and current multiplexing technology, which is applied in the direction of electrical components, modulation transformation balance devices, modulation transfer, etc., can solve the problems of increasing load impedance, etc., to achieve increased load resistance, low input impedance, and reduced Effect of Bias Current

Active Publication Date: 2017-01-04
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional method to increase the conversion gain is to increase the RF transconductance or increase the load impedance

Method used

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  • Current multiplying self-biasing current multiplexing passive frequency mixer
  • Current multiplying self-biasing current multiplexing passive frequency mixer

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Such as figure 1Shown is a current-multiplying self-biased current-multiplexing passive mixer that includes a self-biased input transconductance stage, a passive local oscillator switch, and a low-voltage transimpedance amplifier; the low-voltage transimpedance amplifier is a transconductance-enhanced structure, the N-type metal oxide transistor (hereinafter referred to as NMOS transistor) common-source amplifier is used to increase the transconductance of the P-type metal oxide transistor (hereinafter referred to as PMOS transistor) common-gate transistor. In addition, the present invention introduces an additional differential pair, the transconductor of the differential pair has the same size as the common-gate tube, and is biased at the same direct current, and its gate is connected to the grid of the common-gate tube. The transconductors in the differentia...

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Abstract

The invention discloses a current multiplying self-biasing current multiplexing passive frequency mixer which comprises a self-biasing input transconductance stage, a passive local oscillator switch and a low voltage transimpedance amplifier. The self-biasing input transconductance stage is provided with a self-biasing transconductance stage combined with a capacitive coupling current mirror. On one hand, transconductance current and the transimpedance amplifier are multiplexed. On the other hand, the bias current of the transimpedance amplifier can be precisely fixed. An additional differential pair is introduced in the low voltage transimpedance amplifier. The source of a common-gate tube is equivalent to virtual ground under a transconductance enhancement circuit. A transconductance tube in the differential pair replicates the current of the common-gate tube, and the current is injected into a load. Down-converted current is multiplied. Compared with a conventional passive frequency mixer, the current multiplying self-biasing current multiplexing passive frequency mixer provided by the invention has the advantages that the power supply voltage and bias current are reduced simultaneously; higher efficiency is realized; the conversion gain is improved; and the noise performance is improved.

Description

technical field [0001] The invention relates to a current multiplying type self-bias current multiplexing passive mixer, which belongs to the technical field of mixers. Background technique [0002] In the RF receiving system, the mixer is a key module of the RF front-end, and its power consumption occupies a considerable share in the receiving chain. The low-power design method and circuit structure for the mixer have always been a research hotspot in the industry, and reducing the power supply voltage and reducing the bias current are the main ways to reduce power consumption. When the semiconductor process size reaches below 40nm, the limited output impedance of the short-channel transistor brings challenges to the precise setting of the bias current. For satellite signal receivers such as GPS, the RF front-end needs to achieve higher conversion gain to suppress noise. The traditional method to increase the conversion gain is to increase the RF transconductance or incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14
CPCH03D7/1441H03D7/1466
Inventor 陈超吴建辉李红
Owner SOUTHEAST UNIV
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