
τ=RC=100×103×250×10−12 sec
=2.5×107×10−12 sec
=2.5×10−5 sec
The higher frequency which can be detected with tolerable distortion is
f=2πmaRC1=2π×0.6×2.5×10−51 Hz
=25×1.2π100×104 Hz
=1.2π4×104 Hz
=10.61 kHz
This condition is obtained by applying the condition that rate of decay of capacitor voltage must be equal or less then the rate of decay modulated signal voltage for proper detection of modulated signal.