Design of detector stages for signals with symmetrical or asymmetrical sidebands

The design of detector stages for signals with symmetrical-sideband components can be improved over conventional designs by properly using the long-established theory of such stages. For asymmetrical-sideband signals (i.e. television signals), an improved design is possible using the results of recent investigations. The conditions for the i.f. amplitude curve to fall by a factor of two at the carrier frequency and for the v.f. section of the detector stage to have a wide-band transfer impedance are shown to be unjustified.