GATE ECE 2001 | GATE ECE Year Wise Previous Years Questions

GATE ECE 2001

Subjective

-0

An emitter-follower amplifier is shown in the figure, Z_i is the impedance looking into the base of the transistor and Z₀ is the impedance looking into the emitter of the transistor GATE ECE 2001 Analog Circuits - Bipolar Junction Transistor Question 4 English

(a)Draw the small signal equivalent circuit of the amplifier.
(b)Obtain an expression for z_i.
(c)Obtain an expression for z₀.

GATE ECE 2001

MCQ (Single Correct Answer)

-0.6

An npn BJT has g_m = 38 mA/V, $${C_\mu }\, = {10^{ - 14}}$$ F, $${C_\pi }\, = 4\, \times {10^{ - 13}}\,F$$ and DC current gain $$\beta \, = \,90$$. For this transistor f_T and $${f_\beta }$$ are

$$\eqalign{ & {f_T} = 1.64 \times {10^8}\,\,Hz\,and \cr & {f_\beta } = 1.47 \times {10^{10}}\,\,Hz \cr} $$

$$\eqalign{ & {f_T} = 1.47 \times {10^{10}}\,\,Hz\,and \cr & {f_\beta } = 1.64 \times {10^8}\,\,Hz \cr} $$

$$\eqalign{ & {f_T} = 1.33 \times {10^{12}}\,\,Hz\,and \cr & {f_\beta } = 1.47 \times {10^{10}}\,\,Hz \cr} $$

$$\eqalign{ & {f_T} = 1.47 \times {10^{10}}\,\,Hz\,and \cr & {f_\beta } = 1.33 \times {10^{12}}\,\,Hz \cr} $$

GATE ECE 2001

MCQ (Single Correct Answer)

-0.6

The Oscillator circuit shown in the figure is GATE ECE 2001 Analog Circuits - Oscillators Question 5 English

Hartley Oscillator with $${f_{oscillation}}$$= 79.6 MHz

Colpitts Oscillator with $${f_{oscillation}}$$ =50.3 MHz

Hartley Oscillator with $${f_{oscillation}}$$= 159.2 MHz

Colpitts Oscillator with $${f_{oscillation}}$$=159.2 MHz

GATE ECE 2001

MCQ (Single Correct Answer)

-0.3

The ideal Op-Amp has the following characteristics.

$${R_i}\, = \,\infty ,\,\,A\, = \,\infty ,\,{R_0}\, = \,0$$

$${R_i}\, = \,0,\,\,A\, = \,\infty ,\,{R_0}\, = \,0$$

$${R_i}\, = \,\infty ,\,\,A\, = \,\infty ,\,{R_0}\, = \,\infty $$

$${R_i}\, = \,0,\,\,A\, = \,\infty ,\,{R_0}\, = \,\infty $$

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