lect8 - EECS 240 Analog Integrated Circuits Lecture 8...

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EECS 240 Lecture 8: References © 2006 A. M. Niknejad and B. Boser 1 EECS 240 EECS 240 A A nalog Integrated Circuits nalog Integrated Circuits Lecture 8: References Lecture 8: References Ali M. Niknejad and Bernhard E. Boser © 2006 Department of Electrical Engineering and Computer Sciences
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EECS 240 Lecture 8: References © 2006 A. M. Niknejad and B. Boser 2 Outline Outline • Objectives CMOS implementations Startup circuits Typical performance Constant XXX references
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EECS 240 Lecture 8: References © 2006 A. M. Niknejad and B. Boser 3 References References • Applications Bias current ADC / DAC references • Solutions Voltage references: PTAT (V t = kT/q) • Bandgap Threshold voltage, V TH , V TH Special purpose: Constant g m No “direct” current reference • Specifications – Accuracy: σ of V out /V out Temperature coefficient, TC F Power rejection ratio, PSRR – Trimming Supply voltage Power dissipation
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EECS 240 Lecture 8: References © 2006 A. M. Niknejad and B. Boser 4 Supply Dependent Biasing Supply Dependent Biasing Okay for test circuits, especially if resistors are off- chip. But output current is inaccurate and varies with supply/temperature. Realization of small (nA) currents requires big resistors (too much area).
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EECS 240 Lecture 8: References © 2006 A. M. Niknejad and B. Boser 5 Simple Supply Rejection
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