L08 lecture - Folded Cascode Good general purpose...

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EECS 240 Lecture 8: Folded Cascode B. Boser 1 Folded Cascode Good general purpose single-stage OTA Analysis –B i a s –G a i n – Input capacitance – Frequency response – Feedback, stability – Settling time –N o i s e – Common-Mode Feedback
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EECS 240 Lecture 8: Folded Cascode B. Boser 3 Bias Subcircuit Vbias2 Vbias1 VDD M=250m M6 100 / 1 100 / 1 M7 M8 100 / 0.5 M9 100 / 0.5 100 / 0.5 M10 dc = 200uA I1 dc = 200uA I2 dc = 200uA I3 For device sizes on page 7. EECS 240 Lecture 8: Folded Cascode B. Boser 4 DC Gain, Bias
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EECS 240 Lecture 8: Folded Cascode B. Boser 5 Bias … Differential Inputs EECS 240 Lecture 8: Folded Cascode B. Boser 6 Low Frequency Gain, A dm Gain / Output Range tradeoff –A dm =120 Æ V od = 4.3V –A dm =200 Æ V od = 3.6V (nominal parameter) Increasing A
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This note was uploaded on 08/01/2008 for the course EECS 240 taught by Professor Boser during the Spring '04 term at University of California, Berkeley.

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L08 lecture - Folded Cascode Good general purpose...

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