ANALOG CIRCUITS

The output V₀ of the diode circuit shown in the figure is connected to an averaging DC voltmeter. The reading on the DC voltmeter in Volts, neglecting the voltage drop across the diode, is ____________.

• 10.0v

• 5.0v

• 3.18v

• 2.53v

If the emitter resistance in a common-emitter voltage amplifier is not bypassed, it will

• reduces both voltage gain and input impedance

• reduces voltage gain and increases input impedance

• increases voltage gain and reduces input impedance

• increases both voltage gain and input impedance

In the circuit shown below, V1 and V2 are bias voltages. Based on input and output impedances, the circuit behaves as a

• voltage controlled voltage source

• current controlled voltage source

• voltage controlled current source

• current controlled current source

Consider the CMOS circuit shown in the figure (substrates are connected to their respective sources). The gate width (W) to gate length (L) ratios (WL) of the transistors are as shown. Both the transistors have the same gate oxide capacitance per unit area. For the pMOSFET, the threshold voltage is −1 V and the mobility of holes is 40cm2V.s. For the nMOSFET, the threshold voltage is 1 V and the mobility of electrons is 300cm2V.s. The steady state output voltage V₀ is ___________.

• equal to 0v

• more than 2v

• less than 2v

• equal to 2v

The ideal long channel nMOSFET and pMOSFET devices shown in the circuits have threshold voltages of 1 V and −1 V, respectively. The MOSFET substrates are connected to their respectively sources. Ignore leakage currents and assume that the capacitors are initially discharged. For the applied voltages as shown, the steady state voltages are ____________.

• V1=5v

  V2=5v

• V1=5v

  V2=4v

• V1=4v

  V2=5v

• V1=4v

  V2=-5v

The effect of current shunt feedback in an amplifier is to

• increases both input and output resistance

• decreases both input and output resistance

• increases input resistance and decreases output resistance

• decreases input resistance and increases output resistance

Crossover distortion behavior is characteristic of

• class A output stage

• Common-base output stage

• class B output stage

• class AB output stage

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

• 
  an increase in the low-frequency cutoff frequency

• 
  an increase in the high-frequency cutoff frequency

• 
  a decrease in the low-frequency cutoff frequency

• a decrease in the high-frequency cutoff frequency

A bipolar transistor is operating in the active region with a collector current of 1 mA. Assuming that the β of the transistor is 100 and the thermal voltage (Vt) is 25 mV, the transconductance (gm​) and the input resistance (r π) of the transistor in the common emitter configuration, are

• gm​=40mA/V

  r π​=2.5kΩ

• 
  gm=25mA/V

  r π=15.625kΩgm​

• gm​=40mA/V

  r π​=4.0kΩ

• 
  gm=25mA/V

  r π=2.5kΩgm​

The oscillator circuit shown in the figure has an ideal inverting amplifier. Its frequency of oscillation (in Hz) is

• 1/((2π)root(6)​RC)​

• 1/2πRC​

• 1/(6RC)

• none of these