Module 8 Lab (2)

Define briefly the terms used in filter below, a) pass band b) attenuation band c) Cut off frequency (-3db frequency)

Q.1. Answer True or False and correct errors if found 1. In a certain Op-Amp. if Ad=3500, Ac=0.35, the CMRR=100dB. 2. The voltage series feedback can increase both input and output impedances. 3. A two-pole Sallen-Key high-pass filter contains one capacitor and two resistors. 4. The main feature of a crystal oscillator is the high frequency operation. Each transistor in a class B power amplifier conducts for the entire input cycle. ✓ The Q-point must be centered on the load line for maximum class A output signal swing 7. The differentiator Op-Amp can convert the triangle waveform into sinewave. ✗Class AB power amplifier eliminates crossover distortion found in pure class A. 9. Wien-bridge oscillators are based on positive feedback circuits. 10. The band-reject filter is composed of multiplication of LPF and HPF.

3. An essential part of an AC-DC power supply circuit is the filter, used to separate the residual AC (called the "ripple" voltage) from the DC voltage prior to output. Here are two simple AC-DC power supply circuits, one without a filter and one with: Plug unfiltered Plug Filter Vatered Draw the respective output voltage waveforms of these two power supply circuits (unfiltered versus filtered). Explain why that type of filter circuit is needed.

Answer True or False, then correct errors or explain if any: 1. The term pole in filter terminology refers to the feedback circuit. 2, A voltage shunt feedback with Ai-10, A-20, p 0.45, then Aif will be 1. 3. The integrator Op-Amp circuit can be used to produce square waves. 4. The equivalent circuit of the crystal oscillator is series and parallel (R, C) components. 5. The transistor in a class A power amplifier conducts for the entire input cycle. 6. Bypass capacitors in an amplifier determine the low and high-frequency responses. 7. The midrange voltage gain of an amplifier is 100. The input RC circuit has a lower critical frequency of 1 kHz. The actual voltage gain at f- 100 Hz is 100. 8. The Bessel filter types produce almost ripple frequency response. 9. RC phase shift oscillators are based on both positive and negative feedback circuits. 10. In a high-pass filter, the roll-off region occurs above the critical frequency,

4. Part A: Filters 1. 3. Assignment#5 Refer to Electronic Devices, Floyd chapters 15, 16 and 17 2. The term pole in filter terminology refers to (a) a high-gain op-amp (c) a single RC circuit (b) one complete active filter (d) the feedback circuit A band-pass response has (a) two critical frequencies (c) a flat curve in the passband (b) one critical frequency (d) a wide bandwidth When a low-pass and a high-pass filter are cascaded to get a band-pass filter, the critical frequency of the low-pass filter must be (a) equal to the critical frequency of the high-pass filter (b) less than the critical frequency of the high-pass filter (c) greater than the critical frequency of the high-pass filter When the gain of a filter is minimum at its center frequency, it is (a) a band-pass filter (b) a band-stop filter (c) a notch filter (d) answers (b) and (c)

Response curves for second-order filters are shown in Figure 3. Identify each as Butterworth, Chebyshev, or Bessel. (a) -40 dB/decade (b) (d) out V out -40 dB/decade decade

(b) In a filter, explain what happens at the cut–off frequency.

2. a) Consider the circuit shown in figure 3. i) Determine what type of filter is shown in Figure 3 i) Calculate the corner or cutoff frequency. Take R = 4 k &, L= 2 H, and C= 1 uF. R Figure 3 b) Describe the possibility of building a second order filter with only resistors and capacitors? and design the cutoff frequency of second order filter for low pass filter (Expected: Describe the possibility , design the second order filter for low pass filter circuit and design the cutoff frequency as equation only).

1. The term pole in filter terminology refers to (a) a high-gain op-amp (b) one complete active filter (c) a single RC circuit (d) the feedback circuit 2. A single resistor and a single capacitor can be connected to form a filter with a roll-off rate of (a) -20 dB/decade (b) -40 dB/decade (c)-6 dB/octave (d) answers (a) and (c) 3. A band-pass response has (a) two critical frequencies (b) one critical frequency (c) a flat curve in the passband (d) a wide bandwidth 4. The lowest frequency passed by a low-pass filter is (a) 1Hz (b) О Hz (c) 10 Hz (d) dependent on the critical frequency 5. The quality factor (Q) of a band-pass filter depends on (a) the critical frequencies (b) only the bandwidth (c) the center frequency and the bandwidth (d) only the center frequency 6. The damping factor of an active filter determines (a) the voltage gain (b) the critical frequency (c) the response characteristic (d) the roll-off rate 7. A maximally flat frequency response is known as (a) Chebyshev (b)…

Q6. Design a two-pole low-pass Butterworth filter for an audio amplifier application. The circuit is to be designed such that the bandwidth is 20   kHz.

Hi, parts a-c please and show steps, thank you :)