Boots – shoes – and leggings
Patent
1978-07-21
1979-09-18
Ruggiero, Joseph F.
Boots, shoes, and leggings
307296R, 330257, 307229, 340347DA, G06J 100, H03K 102, H03K 1302
Patent
active
041685288
ABSTRACT:
A simplified temperature stabilized circuit provides a current which is proportional to a variable voltage by the use of branching transistor circuitry which fixes the voltage level of the supplied current, and controls its magnitude. The variable voltage is supplied through a reference resistor to the emitter of a first junction transistor having its base connected to the base of an identical junction transistor having its emitter grounded, thereby fixing the input voltage to the first transistor at a virtual ground potential. A third identical transistor has its base and emitter connected in parallel with the first transistor and carries an equal amount of current. Current derived in parallel from the first and second transistor is positively proportioned relative to the current flowing in the collector path of the third transistor by a pair of mirror-connected transistors having suitable relative areas and load resistors. The desired temperature stabilized current is applied from the bases of the mirrored transistors to the ladder network of a digital to analog converter. Two cascaded digital-to-analog circuits of this type provide a stable analog output voltage proportional to the product of the two numbers represented by the binary inputs.
REFERENCES:
patent: 3634659 (1972-01-01), Lucas et al.
patent: 3683165 (1972-08-01), Grobert et al.
patent: 3717777 (1973-02-01), Cecil
patent: 3932768 (1976-01-01), Takahashi et al.
patent: 4025842 (1977-05-01), Crowle
patent: 4045694 (1977-08-01), Ahmed
patent: 4100436 (1978-07-01), Van de Plassche
Glaser et al--Integrated Circuit Engineering--Addison-Wesley Publishing Co., Reading, Mass., pp. 503-508, 1977.
Precision Monolithics, Inc.
Ruggiero Joseph F.
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