Frequency Response Of Amplifiers Practice Questions

For the closed loop amplifier circuit shown below, the magnitude of open loop low frequency small signal voltage gain is 40. All the transistors are biased in saturation. The current source Iss is ideal. Neglect body effect. channel length modulation and intrinsic device capacitances. The closed loop low frequency small signal voltage gain $\frac{V_{\text {out }}}{V_{\text {\in }}}$ (rounded off to three decimal places) is ____.

The Miller effect in the context of a Common Emitter amplifier explains

Which one of the following statements is correct about an ac-coupled common-emitter amplifier operating in the mid-band region?

The ac schematic of an NMOS common-source stage is shown in the figure below, where part of the biasing circuits has been omitted for simplicity. For the n -channel MOSFET M, the transconductance $g_{m}=1 mA/V$ and body effect and channel length modulation effect are to be neglected. The lower cutoff frequency in Hz of the circuit is approximately at

A bipolar transistor is operating in the active region with a collector current of 1 mA. Assuming that the $\beta$ of the transistor is 100 and the thermal voltage ( $V_{T}$ ) is 25 mV, the transconductance ( $g_{m}$ ) and the input resistance ( $r_{\pi}$ ) of the transistor in the common emitter configuration, are

An npn BJT has $g_{m}=38m\, A/V$ , $C_{\mu }=10^{-14}\,F$ , $C_{\pi }=4\times 10^{-13}\,F$ and DC current gain $\beta _{0}=90$ . For this transistor $f_{T}$ and $f_{\beta }$ are