Analog Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 208 - 210 of 249

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Question 208

Analog Circuits
Mid-Frequency Small Signal Analysis and Frequency Response

Appeared in Year: 2017

Question

Numeric Answer▾

For the DC analysis of the common-Emitter amplifier shown, neglect the base current and assume that the emitter and collector currents are equal. Given that , , and the BJT output resistance is practically infinite. Under these conditions the mid-band voltage gain magnitude, is …

The DC Analysis of the Common-Emitter Amplifier Shown

Question 209

Analog Circuits
Biasing, Bias Stability

Appeared in Year: 2017

Question

Numeric Answer▾

In the figure shown, the transistor acts as a switch.

The Npn Transistor Acts as a Switch

For the input as shown in the figure, the transistor switches between the cut-off and saturation regions of operation, when T is large. Assume collector-to-emitter voltage at saturation and base-to-emitter voltage . The minimum value of the common-base current gain of the transistor for the switching should be …

Question 210

Analog Circuits
Simple Op-Amp Circuits

Appeared in Year: 2016

Question

Numeric Answer▾

An op-amp has a finite open loop voltage gain of . Its input offset voltage is modelled as shown in the circuit below. The amplifier is ideal in all other respects. is .

The Amplifier is Ideal in All Other Respects

The output voltage is …

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