Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2000-12-11
2003-04-29
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S076000
Reexamination Certificate
active
06556050
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed towards the field of signal detection, particularly towards signal detection circuits that differentiate between signal and noise.
BACKGROUND
Window detectors are used in applications where it must be determined if a signal falls within a specified range. In the prior art, they are implemented using two threshold comparators and two reference signals. While it the performance is device dependent, this circuit topology may only be used for signals having a frequency less than 100 MHz. The performance of the circuit is limited by the frequency of the comparators.
SUMMARY
A window detector circuit for high frequency applications includes a differential amplifier that has two inputs which receive a differential voltage signal. A bias network, having a balancing node, is connected between the two inputs. An output transistor, electrically biased by the balancing node, is connected between power and ground.
In operation, when the differential voltage signal is below a voltage threshold, the differential amplifier is turned off and current flows through the output transistor. When the differential voltage signal is at or exceeds the voltage threshold, the differential amplifier turns on.
REFERENCES:
patent: 4055777 (1977-10-01), Black
patent: 6028464 (2000-02-01), Bremner
Agilent Technologie,s Inc.
Kee Pamela Lan
Wells Kenneth B.
LandOfFree
High speed signal window detection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High speed signal window detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High speed signal window detection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3042559