The ratio detector is a type of detector circuit, commonly used in radio receivers for demodulating frequency modulated (FM) signal.[1][2][3][4]
The ratio detector is a variant of the Foster–Seeley discriminator, but one diode conducts in an opposite direction, and using a tertiary winding in the preceding transformer. The output in this case is taken between the sum of the diode voltages and the center tap. The output across the diodes is connected to a large value capacitor, forming a dynamic limiter. The ratio detector has the advantage over the Foster–Seeley discriminator that it does not respond to amplitude modulation (AM) signals, thus potentially saving a limiter stage; however, the output is only 50% of the output of a discriminator for the same input signal. The ratio detector has wider bandwidth, but more distortion than the Foster–Seeley discriminator.
^US 2497840, Seeley, Stuart Williams, "Angle Modulation Detector", issued February 14, 1950
^US 2561089, Anderson, Earl I., issued July 17, 1951
^Report L.B.-645: "Ratio detectors for FM receivers" (15 September 1945) issued by the Radio Corporation of America, RCA Laboratories Industry Service Division, 711 Fifth Avenue, N.Y., N.Y. Reprinted in Radio, pages 18-20 (October 1945).
^Seeley, Stuart W.; Avins, Jack (June 1947), "The ratio detector", RCA Review, 8 (2): 201–236
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