Frequency mixer
A mixer and radio frequency technology, applied in the field of semiconductor integrated circuits, can solve the problems of low double-balanced mixer circuit, double-balanced mixer cannot be applied to low power supply voltage, and power supply voltage drop, so as to reduce the working power supply voltage, The effect of low power supply voltage and stable output operating point
Inactive Publication Date: 2014-05-21
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology
However, due to the continuous adoption of more advanced technology in semiconductor technology, the power supply voltage is also declining. For the double-balanced mixer circuit with traditional structure, it cannot meet the lower and lower voltage requirements. Therefore, the existing double-balanced mixer Not suitable for current advanced low supply voltage designs
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[0026] The mixer of the embodiment of the present invention includes:
[0027] A radio frequency differential input circuit, the two input terminals of the radio frequency differential input circuit are connected to two differential radio frequency voltage signals, and the output terminals of the radio frequency differential input circuit output two differential radio frequency current signals with the same frequency as the differential radio frequency voltage signals.
[0028] A switch circuit, the switch circuit includes two symmetrical switch branches, the differential input ends of the two switch branches are connected to two differential local oscillator signals, the two switch branches are respectively connected to a current source, and the two switch branches are respectively connected to a current source. The current sources of the two switching branches are symmetrical in structure and connected with the same common-mode feedback voltage, and the current sources of the...
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The invention discloses a frequency mixer. The frequency mixer comprises a radio frequency differential input circuit, a switch circuit and a continuous common mode feedback circuit. The radio frequency differential input circuit converts differential radio frequency voltage signals into two channels of differential radio frequency current signals and outputs the differential radio frequency current signals to the switch circuit through the current source input nodes of the switch circuit to form a folding structure, so that only three transistors need stacking between a working power source and the ground, further the voltage of the working power source can be reduced, low-voltage power source working conditions can be achieved, and the requirements for increasingly low working power voltage in advanced technologies can be met. The output signals of the switch circuit are connected to the continuous common mode feedback circuit, and the continuous common mode feedback circuit provides common mode feedback voltage signals serving as the control voltage of the current source of the switch circuit to continuously restrain output common mode signals of the switch circuit and stabilize the output working points of the switch circuit.
Description
technical field [0001] The present invention relates to a semiconductor integrated circuit, in particular to a mixer. Background technique [0002] The radio frequency (RF) front end of the wireless transceiver mainly completes the function of frequency conversion in essence. The RF front end of the receiver converts the received RF signal into a baseband signal, and the RF front end of the transmitter converts the baseband signal to be transmitted into a radio frequency signal. Frequency conversion The function is performed by the mixer. The mixer is an important module in the RF front-end circuit. It is a nonlinear circuit that relies on the nonlinearity of the circuit itself to complete the frequency conversion function. The mixer converts a received RF signal to a lower frequency called an intermediate frequency (IF). It can be seen that the multiplication produces an output signal at the sum and difference of the frequencies of the input signals, and their amplitudes ...
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IPC IPC(8): H03D7/16
Inventor 朱红卫唐敏刘国军
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP