a) Draw the circuit diagram of a basic current mirror circuit. Define gain and error of a current mirror. What are the sources of error in a current mirror? b) Derive the expression for the output resistance Ro and determine the % error due to the output resistance for Wilson current mirror shown in Ckt. 3 (derivation not required for %error). Mention two merits of this circuit over cascode current mirror. c) Find the currents IIN and IOUT in the current mirror circuit shown in Ckt. 4. Assume that all the transistors are matched, base to emitter voltage VBE = 0.7 V, R = 26 kΩ, and ? and ro to be infinite. d) If ?=260, find the percentage of error due to finite ? for Ckt. 4. How the error can be minimized? Draw the modified circuit and write the corresponding error expression for the modified circuit
a) Draw the circuit diagram of a basic current mirror circuit. Define gain and error of a current mirror. What are the sources of error in a current mirror?
b) Derive the expression for the output resistance Ro and determine the % error due to the output resistance for Wilson current mirror shown in Ckt. 3 (derivation not required for %error). Mention two merits of this circuit over cascode current mirror.
c) Find the currents IIN and IOUT in the current mirror circuit shown in Ckt. 4. Assume that all the transistors are matched, base to emitter voltage VBE = 0.7 V, R = 26 kΩ, and ? and ro to be infinite.
d) If ?=260, find the percentage of error due to finite ? for Ckt. 4. How the error can be minimized? Draw the modified circuit and write the corresponding error expression for the modified circuit
Step by step
Solved in 2 steps with 4 images
