Q. A Weinbridge oscillator is a

View solution

Q. CMRR of an op-amp is about 0.1.

View solution

Q. A transistor amplifier has poles at

s1 = - 0.000245 x 10⁹ rad/sec.
s2 = - 0.0748 x 10⁹ rad/sec.
s3 = - 0.670 x 10⁹ rad/sec.
s4 = - 4.38 x 10⁹ rad/sec.

The upper 3 dB frequency of the amplifier will be

View solution

Q. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What value of feedback will double the gain?

View solution

Q. The maximum theoretical efficiency for class A amplifier is

View solution

Q. Assertion (A): A class C amplifier can also be used as frequency multiplier

Reason (R): When narrow current pulses drive a resonant circuit the output can be a near perfect sine wave

View solution

Q. The parameter β of a BJT change by 300%. If self bias is used in the amplifier using this BJT, the quiescent value of IC and VCE remain almost the same.

View solution

Q. A bypass capacitor produces

View solution

Q. Rise time in a transistor is change from

View solution

Q. In a JFET, gates are always

View solution

Q. By connecting external resistances to a differential amplifier we can adjust

View solution

Q. A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What must be the minimum gain of the oscillator to provide oscillations?

View solution

Q. CMRR is the ratio of differential voltage gain to common mode gain.

View solution

Q. The purpose of impedance matching in an amplifier circuit is to achieve

View solution

Q. In a BJT CE amplifier circuit the value of coupling capacitor should be such that

View solution

Q. In order to rectify sinusoidal signals of millivolt range (< 0.6 V)

View solution

Q. The common gate amplifier has a characteristically __________ input resistance and a __________ output resistance.

View solution

Q. For input and later stages, BI-FET op-amp use

View solution

Q. The emitter coupled pair of BJT's gives a linear transfer relation between the differential output voltage and the differential input voltage Vid only when the magnitude of Vid is less a times the thermal voltage, where α is

View solution

Q. In most transistor the collector region is made physically larger than the emitter region

View solution