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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. CMOS Operational Amplifiers3 Analog design for CMOS VLSI SystemsFranco MalobertiOTAIf impedances are implemented with capacitors andswitches, after a transient, the load of the op-amp is madeof pure capacitors.

Analog Design for CMOS VLSI Systems Franco Maloberti Output voltage swing: It is the swing of the output node without generating a defined amount of harmonic distortion. Equivalent input noise: The noise performances can be described in terms of an equivalent voltage source at the input of the op-amp. Typically vn = 40 ÷ 50 nV/ Hz at 1 kHz,

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