Low-noise variable-gain mixer
A low-noise, mixer technology, applied in the field of radio frequency integrated circuit design, can solve problems such as poor noise figure of mixers
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[0018] Combine below Figure 4 The low noise variable gain mixer of the present invention will be further described.
[0019] The low-noise variable-gain mixer of the present invention includes: a low-noise input matching stage circuit, a frequency converting stage circuit, a current splitting stage circuit, a variable load stage circuit, and a gain switching stage circuit. The connections and functions of each part are as follows:
[0020] RF+ and RF- are differential radio frequency input signals, IF+ and IF- are differential intermediate frequency output signals, LO+ and LO- are differential local oscillator input signals, VC is a control port for variable gain, VDD is a power supply, Vb1 and Vb2 are bias Set the port.
[0021] The low-noise input matching stage circuit is a differential input structure, including NMOS transistors MA1, MA2, MA3, MB1, MB2, MB3, capacitors CA1, CA2, CA3, CB1, CB2, CB3, inductors LA1, LB1, the device connection relationship is as follows, di...
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