Harmonic control CMOS frequency mixer based on transformer structure

Abstract

The invention discloses a harmonic control CMOS frequency mixer based on a transformer structure. The frequency mixer comprises a trans-conductance level, a harmonic-controlled transformer network, a switch level and an output level; the trans-conductance level converts an input radio frequency into the radio frequency current, since the transistor is non-linear, the converted radio frequency current contains the fundamental wave and each sub-harmonic component, the radio frequency current is injected into the switch level after the transformer harmonic control network inhibits the second harmonic generation and filters the third harmonic therein; and finally the output level outputs an intermediate frequency signal through the modulation and frequency-mixing of the switch level. The harmonic control network based on the transformer structure is imported between the trans-conductance level and the switch level of the frequency mixer, wherein the harmonic control network has the features of improving the linearity, the isolation degree and the noise performance of the frequency mixer, and reducing the working voltage and the static power consumption.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and in particular relates to a harmonic control CMOS mixer based on a transformer structure. Background technique [0002] The mixer is an important module in the RF transceiver link. It completes the function of converting the signal from RF to IF. The quality of the mixer design directly affects the performance of the entire system link. In recent years, with the rapid development of wireless communication technology, the operating frequency has become higher and higher, and the modulation methods have become more and more complex. Multi-channel technologies such as Phase Array and MIMO have been widely used in communication systems, which poses strict requirements for the design of mixers. stringent requirements. On the one hand, with the increase of operating frequency, it is difficult to increase the output power of the local oscillator LO in the millimeter wave, especially in the ...

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Problems solved by technology

On the one hand, with the increase of operating frequency, it is difficult to increase the output power of the local oscillator LO in the millimeter wave, especially in the THz frequency band, which makes the mixer unable to provide a good gain; on the other hand, in the existing circuit In the structure, although the active mixer can meet the gain requirements and has better port isolation than the passive mixer, there is also a natural problem, that is, the linearity is not high, and the too low input P1dB cannot meet the requirements. The requirements of today's multi-channel design; in addition, active mixers with traditional structures still have problems such as large power consumption and high operating voltage

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