Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1997-04-30
1999-04-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 66, 327 67, 327205, 327206, 330252, 330260, H03F 345, H03F 316
Patent
active
058942343
ABSTRACT:
A differential comparator having a low-offset comparator and two processing paths, each of which receives one of the two primary inputs to the differential comparator and generates one of the two inputs to the low-offset comparator. The output of the low-offset comparator is the output of the differential comparator. Each processing path is capable of (1) generating an offset voltage and (2) turning on and off the generation of that offset voltage. In a preferred embodiment, each processing path has a passive resistor that generates the offset voltage and a pair of shunt transistors that selectively shorts out the passive resistor. The output of the low-offset comparator is connected (either directly or indirectly through an inverter) to the gates of the shunt transistors. The shunt transistors are therefore controlled by the output of the low-offset comparator. In each of two modes of operation, a different one of the passive resistors is "on" while the other passive resistor is "off." The result is a differential comparator that operates with hysteresis. The currents passing through the passive resistors to generate the offset voltages are mirrored from a current source that is controlled by a reference voltage. As such, the offset voltages can be controlled by adjusting the reference voltage. The differential comparator is capable therefore of operating with fixed and controllable hysteresis.
REFERENCES:
patent: 4110641 (1978-08-01), Payne
patent: 4604533 (1986-08-01), Miyamoto et al.
patent: 4754169 (1988-06-01), Morris
patent: 5079454 (1992-01-01), Benton et al.
patent: 5426386 (1995-06-01), Matthews et al.
patent: 5530444 (1996-06-01), Tice et al.
patent: 5541538 (1996-07-01), Bacrania et al.
Callahan Timothy P.
Lucent Technologies - Inc.
Luu An T.
LandOfFree
Differential comparator with fixed and controllable hysteresis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Differential comparator with fixed and controllable hysteresis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential comparator with fixed and controllable hysteresis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-224757