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Voltage Reference Buffer

IP.com Disclosure Number: IPCOM000075941D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Dorler, JA: AUTHOR [+2]

Abstract

The purpose of this circuit is to provide a constant-output voltage V(O) in response to a reference input voltage -V, in combination with a conventional constant-voltage generator 10. The constant-output voltage V(O) insures constant current through a reference transistor 12 connected to the differential amplifying circuit 13. Constant current through the reference transistor 12 in turn insures constant current to the differential amplifier 13. As a result, the output voltage at node X more perfectly tracks the input voltage V(IN) to the differential amplifier 13. The constant-differential voltage V(O) also serves another useful function when the plurality of output loads comprise current-switch circuits.

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Voltage Reference Buffer

The purpose of this circuit is to provide a constant-output voltage V(O) in response to a reference input voltage -V, in combination with a conventional constant-voltage generator 10. The constant-output voltage V(O) insures constant current through a reference transistor 12 connected to the differential amplifying circuit 13. Constant current through the reference transistor 12 in turn insures constant current to the differential amplifier 13. As a result, the output voltage at node X more perfectly tracks the input voltage V(IN) to the differential amplifier 13. The constant-differential voltage V(O) also serves another useful function when the plurality of output loads comprise current-switch circuits. A single output load of many is shown at 14, and comprises a reference transistor 16 and a pair of current-switching transistors 18 and 20. Line 21 connects to a plurality of fan-out current-switch circuits identical to 14 at the base of a transistor corresponding to that shown at 18. responding to transistor 16 in each of the separate current-switch output loads.

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