Lect9_LNAs III

Lect9_LNAs 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 LNAs III 9 1
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Image Reject LNA v in v bias v out v bias v in v out L x C x v bias Z f C 3 C 1 L 5 v out v in v out /v in Low Impedance at Image Freq. Noise Figure Minimize C x imapct on NF ( ) ( ) 2 53 1 3 135 3 1 f LC Cs Zs CCLs Cs ++ = + Z(f) v out /v in 1/gm 3 2 “A 5-GHz CMOS Wireless LAN Receiver Front End”, JSSC, May 2000
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NF Optimization of Ind. Degenerated LNA Decouple Q from C gs High C gs leads to higher gate induced current noise I ng 2 grows with the square of C gs Lower Q is desired for reducing gate induced noise but leads to higher channel thermal noise Lower Q also enables broadband operation 3 11 2 st ms t Q RC gL C ω = =  +   v bias v out L g L s v s R s R L C C d L g L s R s C t =C gs +C d g m L s C t “Optimization of an Inductively Degenerated CMOS Low Noise Amplifier”, TCASII, Sep 2001
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UWB LNA w/ Shunt Feedback & L Degeneration Low Q for wideband Input stage
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Lect9_LNAs III - ECE 894 RF and mmWave Front-end Circuit...

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