Lect11_Mixers II

Lect11_Mixers II - ECE 894 RF and mmWave Front-end Circuit...

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ECE 894 RF and mmWave Front-end Circuit Design Prof. Waleed Khalil Lecture Mixers II 11 1
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Transconductance Linearization (1/4) Resistive Degeneration 2 Broadband linearization technique Linear transconductance on the expense of lower gain Large degeneration resistor impacts voltage headroom and NF Parasitic source capacitance induces a negative input resistance Mixer stability problem ( ) m m G 11 For : 1 G 1 2 : mm ms T m gs T m s bias m gs t gg gR j j gC g gR R I g VV ω ωω = =  ++   << ≈= + = V bias V RF I RF C b R b R s C s Z in { } ( ) 222 1 1 Re m s ss gs s Tss in g R RC C R Z = =
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Transconductance Linearization (2/4) Inductive Degeneration 3 Narrow Band design Limited to near resonance frequencies Lower gain No impact on voltage headroom and minimal impact on NF (inductor loss) Source inductor reflects as positive real input impedance Can be used for input matching similar to LNA Rarely utilized for 50 matching since CMOS mixers are driven on-chip m 2 m G 1 1 G res m gs s m s m m s res s g CL j gL g j gL j L ω ωω =
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Lect11_Mixers II - ECE 894 RF and mmWave Front-end Circuit...

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