Self-calibrating electronic programmable delay line utilizing an

Details Self-calibrating electronic programmable delay line utilizing an Self-calibrating electronic programmable delay line utilizing an

1997-08-05

1999-05-04

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327155, 327160, 327161, 327279, 327281, H03H 1126

Patent

active

059007621

ABSTRACT:
A programmable delay line. The programmable delay line includes a series of delay cells which are programmably connected in series. The programmable delay line includes a main delay chain and auxiliary delay chains. The main delay chain includes unit delay cells. The auxiliary delay chains include a unit delay cell, and a delay cell which has a delay that is between one and two time greater than the delay through a unit delay cell. The delay resolution of the programmable delay line is less than the delay of a unit delay cell. The programmable delay line further includes a reference oscillator and calibration circuitry. The reference oscillator includes a series of unit delay cells, and generates a reference signal having a period which is an integer multiple of the delay of a unit delay cell. Variations in the delay of a unit delay cell influence the period of the reference signal. The reference signal is used to programmably correct the variations in the delay of the programmable delay line due to variations in the delay of a unit delay cell.

REFERENCES:
patent: 5465076 (1995-11-01), Yamauchi et al.
patent: 5789969 (1998-08-01), Davis et al.
patent: 5801562 (1998-09-01), Fuji

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