lecture 22: mixer design (2) - university of california...
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EE142 Lecture22
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Amin ArbabianJan M. Rabaey
Lecture 22: Mixer Design (2)
EE142 – Fall 2010
Nov. 16th, 2010
University of California, Berkeley
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Announcement
Discussion Notes for this week contain another review of mixers, highly recommended!
Review OH notes cover mixers, system design and transformers, make sure to go through (on bspace)
Tomorrow (Rev OH) will go through transformers/ Noise in Mixer/ Examples (as time permits)
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Balanced Mixer Operation
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Output Signal
Vs driving between +RF and -RF
S(t)
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LO Rejection
As before, the RF stage is a transconductance stage. Degeneration can be used to linearize this stage.
Because the bias current at the output is constant IEE/2 regardless of the LO voltage, the LO signal is rejected. This relies on good matching between transistors
The differential operation also rejects even order distortion. Viewed as two parallel Gilbert cells, this mixer is also more linear as it processes only half of the signal.
The noise of this mixer, though, is higher since the noise in each transistor is independent (come back to this point later, also see HW)
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Mixer Analysis: Time Domain
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Time Domain Analysis
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Frequency Domain Analysis
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Frequency Domain (Folding)
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Harmonic Mixer
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Harmonic Mixer Conversion Gain
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Distortion In Mixers
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Noise In Mixers
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Mixer Noise Folding
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Mixer Noise from Switching Pair
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Voltage Switching Mixers
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MOS Voltage Switching Mixer
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Non-Ideal Switches
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MOS Switching (Passive) Mixer Summary
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MOS Ring Mixer
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Passive Mixer LO Power
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LO Power (Inverter Chain)
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Tuned LO Power
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H-Bridge Mixer
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Time-Varying Conductance
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Time-Varying Gain m(t)
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Passive Current Mixer
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Advantages of Passive Current Mixer
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Disadvantages
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Ring or Quad?
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Op-Amp Noise
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Switched Capacitor Noise
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Switched Capacitor Resistor
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Op-Amp Noise
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Output Filter Stage
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APPENDIX I:PERIODIC STEADY STATE SIMULATIONSAlso refer to Discussion notes of 11/08/2010
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Periodic Steady State (PSS) Simulations
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PSS Iteration
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PSS Options
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Periodic AC (PAC) Simulations
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PAC
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PNoise