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EE142 Lecture20
1
Amin ArbabianJan M. Rabaey
Lecture 20: Mixer Circuits
EE142 – Fall 2010
Nov. 4th, 2010
University of California, Berkeley
2EE142-Fall 2010
Announcements/ Review
Make sure to attend Monday’s Discussion, Siva will cover PSS/HB for harmonic simulations (Mixer and Oscillators)
Questions about the Ugrad projects
Transceiver architectures– Will go over again on Wednesday’s Review OH
– Covered in Razavi Ch3 and Ch5
Image problem
Direct conversion– 2nd order nonlinearities (IM2,…)
– Flicker noise
– DC offset
– LO self-mixing
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Hartley Mixer
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Delay Operation
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Multiplying by a Complex Signal
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Multiplying by a Real Signal
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Image Problem (Different View)
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Sine / Cosine Mixing
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Image Rejection
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+/- 45 Degree Circuits
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Other Issues
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BJT with Large Sinusoidal Drive
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BJT Collector Current
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BJT Current
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Collector Current Waveform
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Harmonics in the Current
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Small-Signal Regime
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BJT with Stable Bias
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Differential Pair with Sine Drive
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Differential Pair Waveforms
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Differential Pair Harmonic Currents
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Mixer Analysis
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Mixer Assumptions
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Mixer Output Signal
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BJT Mixer
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AC Equivalent Circuit
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BJT Mixer Analysis (Time-Varying gm(t))
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BJT Mixer Analysis
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LO Drive
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RF Drive
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Mixer Analysis (General Approach)
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General Approach