Lect12_Mixers III

Lect12_Mixers III - 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 III 12 1
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Mixer Noise (1/2) Noise generated by mixer has periodical time varying statistics (i.e. Cyclostationary noise) PSD of noise is time varying, S(f,t) Noise is averaged over time cycle Noise from g m stage, M 3 : Thermal noise, i n 2 M3-th : Noise from f LO ± f IF ,3f LO ± f IF , 5f LO ± f IF …. is downconverted by LO frequency and its harmonics to f IF 1/f noise, i n 2 M3-1/f : 1/f Noise is upconvertered to f LO ,3f LO , 5f LO …. and does not affect the IF Noise from switching pair, M 1 , M 2 : Thermal noise, i n 2 M1-th : Noise from 2f LO ± f IF ,4f LO ± f IF …. is translated by LO to f IF 1/f noise, i n 2 M1-1/f : 1/f Noise appears at IF output without translation Noise from load, R L Thermal noise of two R L resistors directly contributes to output noise 2 R L V IF i n 2 M3_th V LO V RF M 1 M 3 i n 2 M3_1/f i n 2 M1_1/f i n 2 M1_th i n 2 RL_th
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Mixer Noise (2/2)
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Lect12_Mixers III - ECE 894 RF and mmWave Front-end Circuit...

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