Circuit and method for linearizing the output signal of an FM detector
US4567441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1984 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Apr 2, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An output load circuit having a non-linear transfer characteristic is coupled to the differential output of a conventional quadrature detector which produces a more linear version of the S-curve characteristics of the detector. The load circuit comprises differentially connected transistors each having their collector-emitter paths coupled to respective outputs of the multiplied portion of the quadrature demodulator wherein the non-linear differential output signal therefrom drives the non-linear transfer function of the base-emitter junction of the differentially coupled transistors to produce a linear output voltage at the base thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.