Demodulators – Frequency shift keying or minimum shift keying demodulator – Input signal combined with local oscillator or carrier...
Patent
1992-09-04
1994-05-24
Mis, David
Demodulators
Frequency shift keying or minimum shift keying demodulator
Input signal combined with local oscillator or carrier...
329319, 375 51, 375 99, H03D 300
Patent
active
053152620
ABSTRACT:
A demodulator alignment method and apparatus (400) employs an alignment signal generator (401-405) to generate an alignment signal (417) in response to a modulation reference signal (413). The alignment signal (417) is demodulated by a demodulator circuit (402), having a voltage controlled delay element (404) to produce a demodulated alignment signal (419) having distortion components. The demodulated alignment signal (419) is then coupled to a filter (406) which isolates the distortion components. A detector (408) is then employed to detect the isolated distortion components. Next, an error amplifier (410) compares the detected distortion to a reference (430), generates an error signal (450) and applies the error signal (450) to a sampling circuit (412). The sampling circuit (412) samples the error signal (450) and applies the sampled error signal (460) to the voltage controlled delay element (404) as a correction voltage in order to minimize the distortion components at the demodulator output (419) during data recovery.
REFERENCES:
patent: 4987374 (1991-01-01), Burke
patent: 5053717 (1991-10-01), Schulz et al.
patent: 5097221 (1992-03-01), Miller
Hillman Val Jean F.
Mis David
Motorola Inc.
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