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5. CMOS Operational Amplifiers - IMS

5. cmos Operational AmplifiersAnalog design for cmos vlsi SystemsFranco Maloberti5. cmos Operational Amplifiers1 Analog design for cmos vlsi SystemsFranco MalobertiBasic op-ampThe ideal Operational amplifier is a voltage controlledvoltage source with infinite gain, infinite input impedanceand zero output op-amp is always used in feedback cmos Operational Amplifiers2 Analog design for cmos vlsi SystemsFranco MalobertiTypical feedback configuration V0=V2Z4Z3+Z4Z1+Z2Z1 V1Z2Z1 The error due to the finite gain is proportional to 1 / A0. Thiserror must be smaller than the error due to impedancemismatch. V0=V2Z4Z3+Z4Z1+Z2Z1 V1Z2Z1 1+Z1+Z2A0Z1 Finite gain effect:5.

Analog Design for CMOS VLSI Systems Franco Maloberti Power supply rejection ratio: If a small signal is applied in series with the positive (or negative) power supply, it is transferred to the output with a given gain Aps+ (or Aps-). The ratios between differential gain and power supply gains furnish the two PSRRs. Typically: PSRR = 90 dB (DC)

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