| 摘要 |
A sub-harmonic mixer circuit having an input stage (52) and a current modulating stage (64 is disclosed. The input stage (52) receives an RF input signal (RF+, RF-) at a first frequency and generates output currents (il , i2) varying in dependence upon the Rf input signal. The current modulating stage (64) comprises a first transistor (Q3) for receiving a first local oscillator signal (LO0) respective and a second transistor (Q4) for receiving a second local oscillator signal (LO180), 180 degrees out of phase with the first local oscillator signal, such that a modulating current signal (iO), having twice the local oscillator frequency is superimposed onto the output currents.
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