Input buffer circuit including reference voltage monitoring...

Details Input buffer circuit including reference voltage monitoring... Input buffer circuit including reference voltage monitoring...

2006-06-20

2006-06-20

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S089000

Reexamination Certificate

active

07064586

ABSTRACT:
A buffer circuit includes a differential amplifier, a buffering inverter, and a reference voltage monitoring circuit. The differential amplifier has a reference voltage and a current source as inputs. The buffering inverter has an output of the differential amplifier as an input. The reference voltage monitoring circuit includes two transistors and a second current source. An output of the reference voltage monitoring circuit is connected to the buffering inverter so as to minimize an effect of a variation in the value of the reference voltage on signal propagation delay times. The buffer circuit can further include a driver circuit with a comparator. A method of managing signal propagation delays includes providing a differential amplifier, providing at least one buffering inverter, and providing a reference voltage monitoring circuit. The reference voltage monitoring circuit can maintain signal propagation delays as a reference voltage varies.

REFERENCES:
patent: 4626713 (1986-12-01), Lee
patent: 6614270 (2003-09-01), Okamoto et al.
patent: 6777985 (2004-08-01), Moon et al.
patent: 6833739 (2004-12-01), Isoda

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