Question

Tilt of output waveform for the circuit is 1%. Given that input is a square wave ± 10 V, f = 2 kHz, diode cut-in voltage = 0.7, what is the relation between C and R?

(a) RC=20

(b) RC=1/2

(c) RC=2

(d) RC=1/20

I got this question in an internship interview.

Origin of the question is Clamper Circuit topic in portion Diode Circuit of Analog Circuits

Answer 1

The correct option is (d) RC=1/20

To elaborate: To = 1/f = 1 ms; Tdischarge = 0.5 ms

Tilt = 100 *ΔVo/2Vm = 100 *ΔVo/20 = 5 * ΔVo = 1

Thus ΔVo = 0.2 = Idischarge * Tdischarge/C

Idischarge/C = 0.2/Tdischarge = 0.2/0.5 ms = 400

RC = 2Vm/400 = 20/400 = 1/20.