Explanation: Constant current bias offers extremely large resistor under AC condition and thus provide high CMRR value. 7. What is the purpose of diode in differential amplifier with constant current circuit?
A. Total current independent on temperature
B. Diode is dependent of temperature
C. Transistor is depend on temperature
D. None of the mentioned
Answer:A
Explanation: Constant current bias offers extremely large resistor under AC condition and thus provide high CMRR value. 7. What is the purpose of diode in differential amplifier with constant current circuit?
A. Total current independent on temperature B. Diode is dependent of temperature C. Transistor is depend on temperature D. None of the mentioned
Explanation: The base emitter voltage of transistor (VBE) in constant current circuit by 2.5mv/oc, thus diode also has same temperature. Hence two variations cancel each other and total current IQ become in depend of temperature. 8. How to improve CMRR value