Demodulators – Frequency modulation demodulator – Input signal converted to and processed in pulse form
Patent
1988-12-05
1989-10-31
LaRoche, Eugene R.
Demodulators
Frequency modulation demodulator
Input signal converted to and processed in pulse form
375102, 455311, H03D 300
Patent
active
048780294
ABSTRACT:
A complex digital sampling converter, for use with an IF demodulator, includes: an analog-to-digital converter (ADC) receiving the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to four times the IF signal frequency; a digital mixer for converting the sampled data to baseband; a sorter for separating the interleaved sequential in-phase I data words and quadrature-phase Q data words into a pair of concurrent I and Q data word streams; and at least one of a circuit for removing the effects of any DC offset in the analog IF signal applied to the ADC, and a circuit for correcting misalignment errors in the concurrent I and Q streams. Preferably, both correction circuits are utilized, with the DC offset removal circuit using averaging of all of the baseband samples, and the misalignment correction circuit averaging each pair of quadrature-phased Q data words while compensating the in-phase I data streams for the extra delay in the averaged Q data.
REFERENCES:
patent: 4647864 (1987-03-01), Rafferty et al.
patent: 4755761 (1988-07-01), Ray, Jr.
patent: 4814715 (1989-03-01), Kasperkovitz
Herrera Randy G.
Saulnier Gary J.
Thiel Timothy E.
Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
LaRoche Eugene R.
Pascal Robert J.
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