Direct phase digitizing apparatus and method

Details Direct phase digitizing apparatus and method Direct phase digitizing apparatus and method

1993-04-08

1995-10-24

Coles, Sr., Edward L.

Pulse or digital communications

Receivers

Angle modulation

375331, 375346, 329304, H03D 322

Patent

active

054616433

ABSTRACT:
A radio receiver directly digitizes the phase of an intermediate frequency (IF) signal with a desired resolution. The frequency of the reference oscillator in the direct phase digitizer is reduced when compared to the frequency previously required for the same resolution. The reduction in the reference oscillator frequency is accomplished by differentiating between IF zero-crossings that occur during the first half of a reference oscillator cycle and zero-crossings which occur during the second half of the reference oscillator cycle. The apparatus utilizes 2 zero-crossing detectors, the first zero-crossing detector is driven by a positive edge of the reference oscillator signal and the second zero-crossing detector is driven by a negative edge of the reference oscillator signal. Depending upon the alignment of the negative edge zero-crossing indicator and the positive edge zero-crossing indicator, the N-bit phase signal is modified or shifted by one-half a phase sector.

REFERENCES:
patent: 5084669 (1992-01-01), Dent
patent: 5122758 (1992-06-01), Tomita
patent: 5220275 (1993-06-01), Holmquist
patent: 5260975 (1993-11-01), Saito
patent: 5270666 (1993-12-01), Rapeli et al.
patent: 5299232 (1994-03-01), LaRosa et al.
patent: 5367538 (1994-11-01), LaRosa et al.

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