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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. The behavior of the circuit does notdepend on the output resistance of the op-amp and stageswith high output resistance ( Operational transconductanceamplifiers) can be CMOS Operational Amplifiers4 Analog design for CMOS vlsi SystemsFranco MalobertiTransient Vi(0+)=VinC1C1+C//C0 Vo(0+)=Vi(0+)CC0+C Vi( )=VinC1+CC1+C(1+gmr0) Vo( )= Vi( ) gm r0 C0gm5.

Analog Design for CMOS VLSI Systems Franco Maloberti Input offset voltage: In real circuits if the two input terminals are set at the same voltage the output saturates close to VDD or to VSS. Input common mode range: It is the maximum range of the common-mode input voltage which do not produce a significant variation of the differential gain.

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