A. negligible input resistance and high output resistance
B. high input resistance and low output resistance
C. medium input resistance and high output resistance
D. low input resistance as well as output resistance
Related Mcqs:
- In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
A. 23dB
B. 25dB
C. 46dB
D. 50dB - Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
A. Only the temperature
B. only the β of the transistor
C. Both Temperature & β
D. None of the above - In a common emitter, unbypassed resister provides___________?
A. voltage shunt feedback
B. current series feedback
C. negative voltage feedback
D. positive current feedback - A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
A. 2
B. 1
C. 1/2
D. 0 - A change in the value of the emitter resistance Re in a differential amplifier?
A. affects the difference mode gain Ad
B. affects the common mode gain Ac
C.affects both Ad and Ac
D. does not effect either Ad and Ac - Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
A. input voltage dependent linear transfer characteristic
B. high voltage gain
C. high input resistance
D. high CMRR - The early effect in a bipolar junction transistor is caused by_______________?
A. fast turn-on
B. fast turn-off
C. large collector-base reverse bias
D. large emitter-base forward bias - The current gain of a bipolar transistor drops at high frequencies because of____________?
A. Transistor capacitances
B. High current effects in the base
C. Parasitic inductive elements
D. The early effect - Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
A. Internal Capacitance of the device
B. Coupling capacitor at the input
C. Skin effect
D. Coupling capacitor at the output - An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?
A. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
