mixed_signal_notes_set_3

mixed_signal_notes_set_3 - ECE194J /594J notes, M. Rodwell,...

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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Mixed Signal IC Design Notes set 3: More High Frequency Amplifier Design Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Why do we care about impedances matched to 50 Ohms? ( ) terminated - well be must lines or the lines, smission short tran have must Either we . ) 2 exp( 1 form the of ripples gain/phase cause lines ssion on transmi waves Standing 1 Γ Γ τ f j L S 0 10 20 30 40 50 60 70 80 90 100 freq, GHz 24 25 26 27 28 29 30 31 32 dB(S(2,1))
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Why do we care about impedances matched to 50 Ohms? on wafer blocks circuit major between cases) some (in or boundaries chip at Ohms 50 e.g. to interface just and , interfaces internal z - high use can we , dimensions small has IC If 50 ohm interface (Zin=50) 50 ohm interface (Zout=50) IC “core” with high Z interfaces
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Why do we care about transmission lines ? *. * ignored be *cannot * parasitics its but lumped as modeled be can line short a hence , * , / that aware be must we But, lines. the on waves standing ignore can we means This *. * *lumped * as cts interconne all treat can we then short, are which cts interconne has IC the If . parameters - S and lines ion transmiss ignore to like would we when times are There o line line o line line Z L Z C τ = =
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Effect of lumped wiring parasitics on IC performance RL RL important more becomes e capacitanc ct interconne hence and high for designing means I) (low power low for designing , ) / ( is gain the Since of time charging RC an get we And , * , / , parasitics BJT Ignoring lumped. as lines short these model can we Here wiring L L L m L line o line line o line line R R qI kT R g R C Z L Z C = = = = τ
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Effect of lumped wiring parasitics on IC performance response pulse and stability EF upon the effect l substantia have ...can , * that understand will we detail, in response frequency EF studied have we Once o line line Z L τ = RL RL RL RL
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ECE194J /594J notes, M. Rodwell, copyrighted 2011 Getting more bandwidth At this point we have learned basics (MOTC etc) How can we get more bandwidth…. ? Resistive feedback
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This note was uploaded on 12/29/2011 for the course ECE 594A taught by Professor Rodwell during the Fall '09 term at UCSB.

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mixed_signal_notes_set_3 - ECE194J /594J notes, M. Rodwell,...

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