Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1998-01-30
1999-11-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327276, 327243, 327158, H03L 708, H03K 513
Patent
active
059949384
ABSTRACT:
A self-calibrating programmable phase shifter includes a tapped delay line for successively delaying a periodic reference signal to produce a set of phase distributed tap signals. A multiplexer selects one of the tap signals as input to a programmable delay circuit which further delays the selected tap signal to produce an output signal that is phase shifted from the reference signal. A conversion table converts input data indicting a desired phase shift between the reference signal and the output signal into output data for controlling the multiplexer selection and the amount of delay provided by the programmable delay circuit. The phase shifter includes calibration circuitry that convert the phase shifter into an oscillator by feeding the output signal back as input to the tapped delay line and adjusting relationships between the conversion table input and output data so that the period of the output signal has a desired linear relationship to the input data value.
REFERENCES:
patent: 5629651 (1997-05-01), Mizuno
patent: 5712582 (1998-01-01), Yokota et al.
patent: 5847617 (1998-12-01), Reddy et al.
Adolphe Eunja
Callahan Timothy P.
Credence Systems Corporation
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