L06 lecture - Outline Objectives CMOS implementations...

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EECS 240 Lecture 6: References © 2003 B. Boser 1 Outline • Objectives • CMOS implementations • Startup circuits • Typical performance • Constant XXX references EECS 240 Lecture 6: References © 2003 B. Boser 2 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 6: References © 2003 B. Boser 3 Widlar Reference 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 0.5 1 1.5 2 2.5 3 3.5 3.2 0.05 I C2 1.926 10 3 × 0.055 I ref I C2 () Q1 Q2 R1 10kOhm Vout Iref 3 V DC Analysis sweep from 0 to 300u (200 steps) Device Iref DC1 2 1 2 2 1 2 1 2 1 ln ln C s C t s ref t C BE BE I R I I V I I V I R V V + = + = •I C2
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L06 lecture - Outline Objectives CMOS implementations...

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