6 - General Behaviour of IC Amps Direct Coupled (no bypass...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #6 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 General Behaviour of IC Amps Direct Coupled (no bypass or decoupling capacitors) No low frequency cut-off High frequency roll-off due to transistor parasitic capacitors ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 High-Frequency Gain Function ) ( ) ( s F A s A H M = Midband Gain: obtained by ignoring the high-frequency parasitic capacitors Transfer function modeling the effect of the parasitic capacitors at high frequencies ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 High-Frequency Gain Function 1 ) ( s F H Zn Z Z ω K 2 1 , Pn P P K 2 1 , Zeros Poles ( ) ( ) () Pn P P Zn Z Z H s s s s s s s F + + + + + + = 1 1 1 1 1 1 ) ( 2 1 2 1 L L 0 s Typically real poles and zeros ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 3-dB Frequency ECSE334 – Introduction to Microelectronics 6 Khazaka - 2008 3-dB Frequency: Dominant pole 1. In many cases the zeros are at a very high frequency and do not contribute to the response at the frequencies of interest. 2. If one dominant pole exists: The pole is two octaves (factor of 4) smaller than all other poles and zeros then we have: ( ) ( ) Pn P P Zn Z Z H s s s s s s s F + + + + + + = 1 1 1 1 1 1 ) ( 2 1 2 1 L L 1 1 1 ) ( P H s s F +
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2 ECSE334 – Introduction to Microelectronics 7 Khazaka - 2008 3-dB Frequency: Dominant pole 1 1 1 ) ( P H s s F ω + 1 P H Note: H H f π 2 = ECSE334 – Introduction to Microelectronics 8 Khazaka - 2008
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This note was uploaded on 01/27/2011 for the course ECSE 334 taught by Professor Anashamoui during the Spring '10 term at McGill.

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6 - General Behaviour of IC Amps Direct Coupled (no bypass...

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