A WIDE BANDWIDTH DISCRIMINATOR FOR USE IN A RADIO RECEIVER

摘要

A wide bandwidth frequency discriminator circuit (200) employs a wide bandwidth limiting amplifier (202) to amplify the IF signal portion a received RF signal. A delay circuit (204), such as a micro strip transmission line, provides a delayed representation of the amplified signal to a multiplier circuit (206). The multiplier (206) in turn provides a product signal which is the product of the amplified output signal and the delayed representation of the amplified output signal. As will be appreciated, said product signal will be proportional to the phase difference between the amplified output signal and the delayed representation of the amplified output signal. This discriminator (200) operates to form a detection system capable of discriminating between desired and undesired components of the received RF signal even when said desired and undesired components are nearly identical in amplitude. This is due in part to the enhanced frequency response provided by the discriminator (200).