Apparatus and method for direct phase digitizing

Details Apparatus and method for direct phase digitizing Apparatus and method for direct phase digitizing

1993-09-21

1994-11-22

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 83, 329306, 329310, 329346, 455214, H03D 318

Patent

active

053675380

ABSTRACT:
This patent application discusses a direct phase digitizing apparatus (303) for use in a radiotelephone (101). The direct phase digitizing apparatus (303) accepts a first analog signal (309) having a phase, a voltage range and a first frequency. First, the direct phase digitizer generates an estimated phase map (611) having a second frequency and N-bits of resolution. Second, the direct phase digitizer detects a predetermined-voltage crossing (409) of the first analog signal (309). Third, using the predetermined-voltage crossings, the direct phase digitizer samples the estimated phase map. Fourth, a digital phase signal (623) is generated using the samples of the estimated phase map.

REFERENCES:
patent: 3571712 (1971-03-01), Hellworth
patent: 3997847 (1976-12-01), Tong
patent: 4190802 (1980-02-01), Levine
patent: 4561098 (1985-12-01), van Tol
patent: 4584693 (1986-04-01), Levy et al.
patent: 5084669 (1992-01-01), Dent
patent: 5117195 (1992-05-01), Robbins
patent: 5121070 (1992-06-01), Tomita
patent: 5122758 (1992-06-01), Tomita
patent: 5260975 (1993-11-01), Saito
All Digital Adaptive Carrier Tracking Coherent Demodulator, Shigeki Saito, Harui Yamamoto, Yasushi Yamao. NTT Tadio Communication System Laboratories, Feb., 1991, Section 4.1 FIGS. 3 and 4.

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