INEL 5265 Current Mirrors 9162020 Last Lecture Current

INEL 5265 – Current Mirrors 9/16/2020 Last Lecture • Current Source Amplifier → Chp. - 5. 1 ü large signal behavior ü small signal behavior ü design excercise • Cascode Transistor → Chp. - 5. 3 ü large signal effect ü small signal effect The specifications of the circuit have a direct impact on the transistor sizing! Analog Circuit Design VDD Vb M 3 Vout Vcn Vin M 2 M 1 1

INEL 5265 – Current Mirrors 9/16/2020 Common Drain Amplifier VDD Vin M 1 Vout Ibias Simplified Schematic Analog Circuit Design ID Vb M 2 Implementation VGS 2

INEL 5265 – Current Mirrors 9/16/2020 Common Drain Amplifier as an Output Stage Maximum source and sink capabilities? p. MOS n. MOS VDD Vin Vb M 1 Vout Vb M 2 VSS Analog Circuit Design VDD M 2 Vout Vin M 1 RL RL VSS 3

INEL 5265 – Current Mirrors 9/16/2020 Problem 5. 1 -11 Analog Circuit Design 4

INEL 5265 – Current Mirrors 9/16/2020 Current Mirrors Chap. #4. 4 VDD Circuits used to replicates, amplify or minimize an given input current. Iin Vin Ideal Behavior • Linear Gain Iout + Current Mirror _ + _ Vout Ai Iin • Low Input Impedance Iin 1/Rin Vin • High Output Impedance Iout 1/Rout Vout Analog Circuit Design 5

INEL 5265 – Current Mirrors 9/16/2020 Basic Current Mirror • DC Analysis • AC Analysis • Parameter Mismatch Effects VDD Iout iin Rin iout Rout Iref M 1 Analog Circuit Design M 2 M 1 M 2 6