Active frequency mixer with high linearity and high gain and method

Abstract

The invention relates to an active frequency mixer with a high linearity and a high gain and a method. The active frequency mixer comprises two transconductance amplifier circuits which access radio frequency differential voltage signals. The radio frequency differential voltage signals are subjected to transconductance amplifying conversion to be a first radio frequency current signal and a second radio frequency current signal. Two auxiliary transconductance amplifier tubes access the radio frequency differential voltage signals, and the radio frequency differential voltage signals are subjected to transconductance amplifying conversion to be a third radio frequency current signal and a fourth radio frequency current signal. The third radio frequency current signal and the fourth radio frequency current signal are subjected to current amplification through a first current mirror and a second current mirror and are superposed with the first radio frequency current signal and the second radio frequency current signal to form two superposed radio frequency current signals which are inputted to a switch level circuit. A load level circuit output direct current to the switch level circuit, the switch level circuit accesses an oscillator signal, the two superimposed radio frequency current signals are subjected to periodic reversing, and the frequency mixing is realized. According to the active frequency mixer, the contradiction between linearity and gain can be solved, and the linearity and the gain are improved at the same time.

Description

technical field [0001] The invention relates to the technical field of mixers, in particular to an active mixer with high linearity and high gain and a method thereof. Background technique [0002] In wireless communication technology, radio frequency receiver is essential. In the RF front-end, the mixer is a key part, and its performance index will directly affect the quality of the entire wireless communication system. The linearity of the mixer usually determines the dynamic range of the RF receiver. [0003] With the continuous reduction of the feature size of the CMOS process, the characteristic frequency of the CMOS process has been continuously increased, and has changed from a few GHz to tens of GHz, or even hundreds of GHz. The CMOS process is especially suitable for the integration of analog circuits and digital circuits on a single chip to form a SOC. design plan. The reduction in the size of the MOS tube reduces the power supply voltage and power consumption. ...

AI Technical Summary

Problems solved by technology

The main disadvantage is that the gain of the mixer is greatly reduced, and when resistive feedback is used, it also introduces input noise

Furthermore, the traditional Gilbert active mixer in the prior art has poor linearity, and there is a compromise between linearity and gain, which makes it unable to meet the modern requirements for high performance receivers.

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