Need Some Help in Designing Shaping Amplifier

OK, Ejaz484, here's the circuit you gave us. Shaik, it's easy enough to work through, just take each piece as you come to it. Get out your calculator and follow along step by step, checking my math.

You can make the straight-line frequency-response sketch from the breakpoints we uncover.

The drawing is hard to make out with CR4's compression, so I'll post it in stages.

The input has a DC attenuation of 1/350. With C1 = 792pF it has a zero (rising response, starting) at f₁ = 537 Hz. This is a strong rising gain, 6dB/octave, which continues until f₂ = 350*537 = 188kHz, above which the input has unity gain.

The 1st-stage amp has unity DC gain, and it has an AC gain of 10 above 159 Hz.

So the input stage basically has a rising response from 537 Hz to 188 kHz, about 2.5 decades, or eight octaves, and finishes up with a gain of 10.

Let's do the second stage, taking it one step at a time.

The 2nd-stage input filter features an LC + R, with 330μH and 1300pF. It has unity gain at DC, and goes to a resonance peak at f₃ = 243kHz. You know, ω² = 1 / LC. The resonant LC impedance is ω L = 504 ohms, and we see an 806-ohm series damping resistor, so the resonance has a modest Q of 806/504 = 1.6.

We can characterize the frequency response of this portion as flat to almost 243kHz, where it has a small peak, above which it falls at 12dB/octave.

The 2nd-stage amp also has unity DC gain, and it has a variable AC gain of 10 to 23.2, starting above 159 Hz at G=10.

Let's do the third stage, one step at a time. It's very similar to the 2nd stage, with an LC resonant peak, except with a smaller LC, so at a higher frequency.

The 3rd-stage input filter has LC + R, with 180μH and 1240pF. It also has unity gain at DC, and a resonance peak a bit higher at f₄ = 337kHz. Its resonant LC impedance is = 381 ohms, and it has a 442-ohm damping resistor, so the resonance has a modest Q = 1.16, lower than the 2nd stage Q.

So the frequency response of this 2nd LC-portion is flat to almost 337kHz, where it has a small peak, above which it also falls at 12dB/octave.

The 3rd-stage amp has unity DC gain, and a variable AC gain of 17.5 to 21.5, starting above 318 Hz at G=17.5. It's not clear why this stage is made variable, with such a small adjustment range - the needed gain range could have been included in the 2nd stage. Pots are generally considered more unreliable than fixed resistors, and their use should be minimized.

It'd be interesting Shaik, to see your overall response sketch. But we can generalize and say the shaping circuit has a rising frequency response over more than eight octaves from f₁ to f₂, or about 0.5kHz to almost 250kHz, where it flattens out a bit, has a few little humps as it pushes its way to about 350kHz, and then falls off like a rock.

Maybe you can tell us a bit about what this is for.