A Mixer Circuit with LO Phase Mismatch Compensation Function

Abstract

The present invention provides a mixer circuit with a local oscillator phase mismatch compensation function, comprising: a first transconductance input stage, a second transconductance input stage, a first switching mixing stage, a second switching mixing stage, a second switching mixing stage, A mismatch compensation stage, a second mismatch compensation stage, an output load stage, a first inductance, and a second inductance; the first transconductance input stage and the second transconductance input stage receive RF voltage signals, and convert the RF voltage signals is the current signal; the first switch mixing stage and the second switch mixing stage are controlled by the local oscillator signal LO, and periodically commutate the current signal to convert the frequency from radio frequency to intermediate frequency to complete the frequency conversion; output load stage, for high The frequency signal is filtered and suppressed, and the corresponding intermediate frequency current signal is converted into an output IF voltage signal; the first mismatch compensation stage and the second mismatch compensation stage detect the mismatch signal of the local oscillator to feedback and compensate the switching time of the local oscillator switch deterioration of circuit performance.

Description

Technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and in particular relates to a mixer circuit. Background technique [0002] The mixer is a key module in the radio frequency receiver, because it completes the RF-IF frequency conversion and directly determines the receiver's architecture system. In order to reduce the contribution of the mixer and the subsequent circuit noise to the system noise, and to compensate for the loss of the intermediate frequency filter, the mixer needs a certain conversion gain. Among them, Gilbert-based active mixers are widely used in radio frequency integrated front-ends of various architectures due to their high mixing gain and superior port isolation. However, its noise figure is relatively high. [0003] The noise of the active mixer mainly comes from the flicker noise of the switching stage, the thermal noise and the thermal noise of the radio frequency transconductance stage. Because the flicker ...

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Problems solved by technology

In fact, after the LO signal transmitted from the voltage-controlled oscillator to the mixer is buffered and path-delayed, there will inevitably be an imbalance in amplitude and phase, which will prolong the switching time of the switch pair of the mixer and degrade the circuit performance [B Guo ,S An, An analytical model of conversion gain for submicron activemixers with LO offsets, Frequenz,vol.67(3–4):85-91,2013]

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