GATE EC Analog Circuits questions

The voltage gain $\mathrm{A}_{u}=\frac{\mathrm{V}_{0}}{\mathrm{~V}_{i}}$ of the JFET amplifier shown in the figure is

A zener diode regulator in the figure is to be designed to meet the specifications: $I_{L}=10 \mathrm{~mA}$, $\mathrm{V}_{0}=10 \mathrm{~V}$ and $\mathrm{V}_{m}$ varies from $30 \mathrm{~V}$ to $50 \mathrm{~V}$. The zener diode has $V_{z}=10 \mathrm{~V}$ and $I_{z k}$ (knee current) $=1 \mathrm{~mA}$. For satisfactory operation.

The circuit in figure employs positive feedback and is intended to generate sinusoidal oscillation. If at a frequency $f_{0}, \mathrm{~B}(f)=\Delta \frac{V_{f}(f)}{V_{0}(f)}=\frac{1}{6} \angle 0^{\circ}$, then to sustain oscillation at this frequency

An amplifier using an opamp with a slew-rate $S R=1$ $V / \mu \mathrm{sec}$ has a gain of $40 \mathrm{~dB}$. If this amplifier has to faithfully amplify sinusoidal signals from dc to $20 \; \mathrm{kHz}$ without introducing any slew-rate induced distortion, then the input signal level must not exceed.

The ideal $\text{OP-AMP}$ has the following characteristics.

The effective channel length of a MOSFET in saturation decreases with increase in

MOSFET can be used as a

The current gain of a BJT is

In the figure, assume the OP-AMPs to be ideal. The output $v_{0}$ of the circuit is

The inverting OP-AMP shown in the figure has an open-loop gain of $100.$ The closed-loop gain $\frac{v_{0}}{v_{s}}$ is

The oscillator circuit shown in the figure,

The transistor shunt regulator shown in the figure is has a regulated output voltage of $10 \mathrm{~V}$, when the input varies from $20 \mathrm{~V}$ to $30 \mathrm{~V}$. The relevant parameters for the zener diode and the transistor are: $\mathrm{V}_{\text{Z}}=9.5, \mathrm{~V}_{\text{SE }}=0.3 \mathrm{~V}, \beta=99$. Neglect the current through …

An npn $\text{BJT}$ has $\mathrm{gm}=38 \mathrm{~m} \mathrm{~A} / \mathrm{V}, \mathrm{C}_{u}=10^{-14} \mathrm{~F}$, $C_{\pi}=4 \times 10^{-13} \mathrm{~F}$, and $D C$ current gain $\beta_{0}=90$. For this transistor $f_{\mathrm{T}}$ and $f_{\beta}$ are

The circuit of the figure represents a

The most commonly used amplifier in sample and hold circuits is

Assume that the $\text{on-amp}$ of the figure is ideal. If $\text{vi}$ is a triangular wave, then $\text{vo}$ will be

The configuration of given figure is a

If the $\text{op-amp}$ in figure is ideal, then $v_{0}$ is

The current gain of a bipolar transistor drops at high frequencies because of

Introducing a resistor in the emitter of a common amplifier stabilizes the $\text{dc}$ operating point against variations in