Performance Parameters
• Gain (convolution analysis)• Port-to-Port Feedthrough• (Noise)• (Linearity)
Feedthrough Mechanism in a Mixer
(LO re-radiation)
Single Ended Pasive RF Mixer
Frequency Spectrum
LO
RF
Differential Mixer
Frequency Spectrum
ComparisonReduced RF FeedthroughReduced DC Offset
Double Balanced Passive Mixer
Frequency Spectrum
No DC, RF, and LO Feedthrough
Sampling Mixer
Rf: 100 Hz, LO: 400 Hz
Waveform of Sampling Mixer
DFT of the Output Spectrum
Use PMOS to Improve Sampling
Improved Sampling Due to PMOS
Output Spectrum of CMOS Switch