Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sinusoidal output
Patent
1995-06-21
1996-05-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sinusoidal output
327107, 327105, 332144, 332145, 364721, 364718, 375373, H03B 100
Patent
active
055215343
ABSTRACT:
A numerically controlled oscillator (10) includes a difference engine (12) that receives a numerator signal (14) and a numerator minus denominator signal (16). The numerator signal (14) and the numerator minus denominator signal (16) represent constant input values for a desired fractional relationship between a sine wave output signal (34) and a sample clock input signal (20) of numerically controlled oscillator (10). The difference engine (12) generates a difference output signal (18) that is received by a phase adder (22) for adding either a one or a zero to a combination of the delta phase input signal (24) and a phase accumulator output signal (26). The difference engine (12) optimally distributes ones and zeros so as to minimize phase jitter in the output signal (34).
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Callahan Timothy P.
DSC Communications Corporation
Wells Kenneth B.
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