Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-05-24
1992-08-04
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307263, 307359, 307491, 307494, H03K 524
Patent
active
051361841
ABSTRACT:
A comparator for use in an A/D converter such as an algorithmic type. The circuit includes a push-pull inverter gain stage having two series-connected MOSFETs. The input of this inverter is driven by a signal from a preceding current-comparison stage where an input current is compared to a reference current to set the signal level on an input node of the inverter. The trigger point of the inverter is altered by an additional MOSFET, connected in parallel with one of the inverter MOSFETs, and having its gate controlled by the output of a bias voltage control circuit. This circuit includes a control inverter stage matched to the comparator inverter and driven by a control current-comparison circuit matched to the corresponding comparator current-comparison circuit. The input and output nodes of the control inverter are connected to the inputs of an op-amp the output of which controls the gate voltage of an additional MOSFET in parallel with one of the control inverter MOSFETs so as to force the input and output nodes to be of equal voltage. The resulting op-amp output signal serves as the bias signal for the additional MOSFET in parallel with one of the comparator inverter MOSFETs, and sets the trigger point of the comparator inverter at a level equal to the balance point of the preceding current-comparison stage, thereby assuring fast transition times.
REFERENCES:
patent: 4410813 (1983-10-01), Barker et al.
patent: 4751405 (1988-06-01), Bufano, Jr. et al.
patent: 4791318 (1988-12-01), Lewis et al.
Analog Devices Incorporated
Zazworsky John
LandOfFree
Fast-acting current comparator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fast-acting current comparator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast-acting current comparator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-780369