Constant propagation delay current reference

Details Constant propagation delay current reference Constant propagation delay current reference

1988-03-03

1989-08-29

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072966, 323315, 328140, 331 1R, H03K 301, G05F 316

Patent

active

048620157

ABSTRACT:
A constant propagation delay current reference is provided having an external source providing a reference frequency signal. A phase lock loop is provided which is responsive to the reference frequency signal and to an operating frequency signal to provide a current reference signal at the output of the loop. The current reference signal is provided to a current to frequency converter which generates the operating frequency signal. A current mirror, also coupled to the phase lock loop output provides an output current proportional to the current reference signal which is suitable for providing the injector current for I.sup.2 L devices. The output current tracks the process, voltage and temperature variations of the integrated circuit, allowing the injector currents to be optimized for maintaining constant propagation delay in the circuits being powered.

REFERENCES:
patent: 4216396 (1980-08-01), Gillberg et al.
patent: 4329637 (1982-05-01), Davis

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