A. gm r0
B. gm / r0
C. gm rπ
D. gm /rπ
Analog Electronics
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
A. 49dB
B. 51dB
C. 98dB
D. 102dB
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
Which of the following is not associated with a p-n junction?
A. junction capacitance
B. charge storage capacitance
C. depletion capacitance
D. channel length modulation
A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
A. 5 Ω & 20 %
B. 25 Ω & 20 %
C. 5 Ω & 16.7 %
D. 25 Ω & 16.7 %
The cascade amplifier is a multistage configuration of__________?
A. CC-CB .
B. CE-CB
C. CB-CC
D. CE-CC
. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?
A. 2.3mA
B. 3.2mA
C. 4.6 mA
D. 5.2mA
The effective channel length of a MOSFET in a saturation decreases with increase in___________?
A. Gate voltage
B. Drain voltage
C. Source voltage
D. Body voltage
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
A. 0.25
B. 0.5
C. 0.75
D. 1
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
A. 795mV
B. 395mV
C. 795 mV
D. 39.5mV
