Electronics Class Notes — Tutorial 11

Teacher: Prof P. M. Sarun • NPHC206 • WINTER - 2025-2026 • Last updated:

Questions

  1. An OP-amp has a gain-bandwidth product of \(15 \,\text{MHz}\). Determine the bandwidth of OP-amp when \(A_{CL} = 500\). Also find the maximum value of \(A_{CL}\) when \(f_{2} = 200 \, \text{kHz}\).
  2. Determine the maximum operating frequency for an inverting amplifier with \(V_{CC} = 10 \,\text{V}\) and \(V_{EE} = -10 \,\text{V}\). The slew rate is \(0.5 \,\text{V/}\mu\text{s}\).
  3. The inverting amplifier (\(V_{CC} = 10 V\), \(V_{EE} = -10 V\), slew rate is \(0.5 \,\text{V/}\mu\text{s}\) is being used to amplify an input signal to a peak output voltage of \(100 mV\). What is the maximum operating frequency of the amplifier?
  4. Determine the value of \(Rf\) required to produce a closed-loop voltage gain of \(–100\), when \(Ri = 2.2 k\Omega\).
  5. Calculate the output voltage from the non-inverting amplifier circuit for an input of \(120 \mu V\). (\(V_{CC} = +16 V\), \(V_{EE} = -16 V\), \(Rf = 240 k\Omega\), \(Ri = 2.4 k\Omega\))
  6. Find the maximum operating frequency for the noninverting amplifier circuit (\(V_{CC} = +18 V\), \(V_{EE} = -18 V\), \(Rf = 100 k\Omega\), \(Ri = 10 k\Omega\), \(0.5 \,\text{V/}\mu\text{s}\), \(RL = 10 k\Omega\)).
  7. Determine the bandwidth of each of the non-inverting amplifiers having an open-loop voltage gain of \(100 dB\), \(Rf = 220 k\Omega\), \(Ri = 3.3 k\Omega\) and a unity-gain bandwidth of \(3 MHz\).
  8. Determine the bandwidth of each of the inverting amplifiers having an open-loop voltage gain of \(100 dB\), \(Rf = 47 k\Omega\), \(Ri = 1 k\Omega\) and a unity-gain bandwidth of \(3 MHz\).
  9. Find the maximum operating frequency of a voltage follower (\(V_{CC} = +16 V\), \(V_{EE} = -16 V\), Slew rate = \(0.5 \,\text{V/}\mu\text{s}\)).

Answers

  1. \(ACL =\frac{funity}{f_{2}} = 30 \, \text{kHz}\)
  2. \(f_{\text{max}} = \frac{\text{Slew rate}}{ 2 \pi V_{pk}} = 9.95 \, \text{kHz}\), Hint: \(0.5 V/\mu s = 500 \, \text{kHz}\)
  3. \(f_{\text{max}} = 796 \, \text{kHz}\)
  4. \(R_{\text{f}}= 220 k\Omega\)
  5. \(v_{\text{o}}= 12.12 mV\)
  6. \(f_{\text{max}} =14.47 \, \text{kHz}\)
  7. \(f_{\text{max}}= 44.3 \, \text{kHz}\)
  8. \(f_{\text{max}}= 63.8 \, \text{kHz}\)
  9. \(f_{\text{max}}= 26.53 \, \text{kHz}\)

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