Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-12-29
1977-04-12
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307362, 330 22, H03K 112, H03F 304
Patent
active
040177483
ABSTRACT:
Matched semiconductor junctions on a single integrated circuit chip are connected in a current mirror arrangement to provide a low power AC level detector arrangement using only one resistor. Two transistors are identical except for junction area and each is in series with a constant current source. Since all other physical characteristics are identical, when identical voltages are applied, the junction currents are related by the ratio of their areas. By fabricating the area of the second emitter-base junction to be less than the area of the first, a portion of the current from the second current source is diverted therefrom to the base of a third transistor, forcing the latter into saturation. Accordingly, when an AC input signal of at least threshold level is coupled to the base of the second transistor, the current in the second transistor is driven to the level of its source. The current formerly diverted to the third transistor now drops to zero and the voltage across the third transistor rises immediately to its supply voltage. The input threshold level required to shut off the third transistor can be varied by different chip design parameters or by modifying a current source with an external digital control.
REFERENCES:
patent: 3778640 (1973-12-01), Platt et al.
patent: 3886466 (1975-05-01), Wheatley, Jr.
patent: 3903479 (1975-09-01), Limberg
patent: 3906386 (1975-09-01), Honqu et al.
Davis B. P.
Gillman James W.
Miller, Jr. Stanley D.
Motorola Inc.
Parker Margaret Marsh
LandOfFree
Monolithic AC level detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Monolithic AC level detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monolithic AC level detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1282982