Timer circuit with adaptive reference

Details Timer circuit with adaptive reference Timer circuit with adaptive reference

2006-11-21

2006-11-21

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C368S107000, C368S108000

Reexamination Certificate

active

07138843

ABSTRACT:
A timer circuit includes a current mirror, a capacitor, a first switch, a resistor and a comparator. The current mirror receives a reference current and provides first and second currents with a predefined current ratio. The first switch, controlled by a control signal, allows the capacitor to be charged by the first current or be discharged. The resistor is biased by the second current to provide an adaptive reference voltage. The comparator compares the voltage across the capacitor and the adaptive reference voltage and triggers an output signal when the capacitor voltage is increased to the adaptive reference voltage. Alternately, the timer circuit includes a pin for coupling to an external resistor and an open pin detector circuit to detect the presence of the external resistor and to automatically select the adaptive reference voltage if a resistor is present or an internal reference voltage if the resistor is absent.

REFERENCES:
patent: 5780904 (1998-07-01), Konishi et al.
patent: 5910739 (1999-06-01), Stanojevic
patent: 6147825 (2000-11-01), Alini et al.
patent: 6795286 (2004-09-01), Maloney et al.
patent: 6968167 (2005-11-01), Wu et al.

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