Electronic Devices and Circuit Theory:: BJT Amplifiers

An emitter-follower amplifier has an input impedance of 107 kΩ. The input signal is 12 mV. The approximate output voltage is (common-collector)

A. 8.92 V
B. 112 mV
C 12 mV
D. 8.9 mV

The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.

A. resistive, ohms, megohms
B. capacitive, microfarads, farads
C inductive, millihenrys, henrys
D. None of the above

A Darlington pair amplifier has

A. high input impedance and high voltage gain.
B. low input impedance and low voltage gain.
C a voltage gain of about 1 and a low input impedance.
D. a low voltage gain and a high input impedance.

A Darlington pair provides beta ________ for ________ input resistance.

A. multiplication, decreased
B. multiplication, increased
C division, decreased

Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?

A. Small-signal
B. Large-signal
C Small- or large-signal
D. None of the above

Page 1 of 9