ABSTRACT
The function of a receiver is to recover the original signal. There are number of signals floating in the space, the receiver should be able to select the signal of the desired frequency. The process of separating the original signal from the (AM) radio wave and grounding the carrier is called demodulation or detection. The A.M. wave is applied at the input terminals of the circuit. As the diode is operated in the linear region of its characteristic, during positive cycle of the A.M. wave, the output is proportional to the input signal voltage. All modem radio receivers are essentially the superheterodyne receivers. The superheterodyne receiver can be designed using discrete components.
