Active frequency mixer and active frequency mixer-based frequency mixing method
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A mixer and frequency mixing technology, applied in multi-frequency modulation conversion, modulation and conversion balancing devices, electrical components, etc., can solve the problems of high linearity, performance loss, high gain, etc.
Active Publication Date: 2016-11-02
WUHAN SYNTEK CO LTD
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[0007]
The present invention aims at the technical problems existing in the prior art that the mixer cannot have both excellent gain and excellent linearity performance at the same time, and the corresponding compensation measures will bring performance loss or limitations in other aspects, and provides An active mixer and a mixing method based on the active mixer. The mixer of the application scheme can have the characteristics of high gain and high linearity without affecting its power consumption and noise performance. And it can guarantee a stable gain in a wide signal input range
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Embodiment 1
[0060] Please refer to figure 1 , an embodiment of the present invention provides an active mixer, which is used to process a differential input radio frequency signal to obtain a differential output intermediate frequency signal. Specifically, the mixer includes: a first-stage circuit 1 and a second-stage circuit 2;
[0061] The first stage circuit 1 includes: a first switch tube unit 11 and a second switch tube unit 12;
[0062] The first switching tube unit 11 is used to input the original radio frequency signal (RF0+, RF0-), and when working in the saturation region, amplify the original radio frequency signal (RF0+, RF0-) to obtain the first amplified radio frequency signal (RF1+ , RF1-);
[0063] The second switching tube unit 12 is used to output a third-order nonlinear current when working in the weak inversion region, and perform linearity adjustment processing on the first amplified radio frequency signal (RF1+, RF1-) to obtain a second amplified radio frequency si...
Embodiment 2
[0100] Based on the same invention concept, please refer to Figure 8 , the embodiment of the present invention also provides a mixing method based on an active mixer, wherein the mixer includes a first-stage circuit 1 and a second-stage circuit 2; the first-stage circuit 1 includes a first Switch tube unit 11 and the second switch tube unit 12; the mixing method includes the following steps:
[0101] S1. Input the original radio frequency signal (RF0+, RF0-) through the first switching tube unit 11, and control and adjust the bias voltage of the first switching tube unit 11, so that the transistors in the first switching tube unit 11 work in the saturation region, Then amplifying the original radio frequency signal (RF0+, RF0-) to obtain a first amplified radio frequency signal (RF1+, RF1-);
[0102] S2. Input the first amplified radio frequency signal (RF1+, RF1-) through the second switching tube unit 12, and control and adjust the bias voltage of the second switching tube...
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Abstract
The invention discloses an active frequency mixer and an active frequency mixer-based frequency mixing method and belongs to the field of wireless communication transceivers. The active frequency mixer comprises a first stage circuit (1) and a second stage circuit (2), wherein the first stage circuit (1) comprises switch tube units (11, 12); when working at a saturation area, the switch tube units (11, 12) are used for amplifying an input original radiofrequency signal (RF0+ / -) so as to obtain an amplified radiofrequency signal (RF1+ / -); when working at a weak inversion area, the switch tube unit (12) is used for outputting a three order non-linear current and subjecting the amplified radiofrequency signal (RF1+ / -) to linearity adjusting operation so as to obtain an amplified radiofrequency signal (RF2+ / -), and the second stage circuit (2) is used for subjecting the amplified radiofrequency signal (RF2+ / -) and a local oscillator signal (LO+ / -) to frequency mixing operation and load matching operation so as to obtain an intermediate frequency signal (IF+ / -). The active frequency mixer disclosed in the invention is characterized by high gain and high linearity while power consumption and noise performance of the active frequency mixer remain unchanged.
Description
technical field [0001] The invention relates to the field of wireless communication transceivers, in particular to an active mixer and a mixing method based on the active mixer. Background technique [0002] With the development of wireless communication technology, integrated wireless communication chips are widely used in combat systems, large-scale emergency communication systems, navigation and positioning, Internet of Things, sensor networks, digital TV broadcasting, public safety, smart building homes, radio stations, mobile terminals , Toy electronics and other industries have correspondingly derived a variety of communication protocol standards. In order to meet the needs of the market, the most popular research in the field of wireless communication is to design a multi-protocol compatible transceiver chip to meet the increasing needs of users for voice, video, data browsing, etc., which requires wireless communication receivers The most front-end RF modules have g...
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Application Information
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