H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/111, 325/82
H04B 1/26 (2006.01) H03D 3/24 (2006.01) H03L 7/087 (2006.01) H04L 27/227 (2006.01) H03D 7/16 (2006.01)
Patent
CA 1238952
ABSTRACT OF THE DISCLOSURE Disclosed is a demodulation circuit for use in a heterodyne receiver for stably demodulating a carrier-suppressed double-sideband signal such as a 2-phase or phase PSK signal. The demodulation circuit comprises a reference oscillator oscillating at a frequency corresponding to an intermediate frequency, and the frequency difference between the reference frequency and the input frequency is detected by a costas loop, a signal indicative of the frequency difference being fed back to a local oscillator through a loop filter thereby stabilizing the intermediate frequency.
492125
Amada Nobutaka
Noda Tsutomu
Shinkawa Keiro
Hitachi Ltd.
Kirby Eades Gale Baker
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