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Voltage Reference Supply

IP.com Disclosure Number: IPCOM000079753D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Blumberg, RJ: AUTHOR [+3]

Abstract

This circuit provides a low power internally generated reference voltage for constant-current source requirements. The circuit is powered by a reference voltage supply -VEE applied to terminal 10. The resistors R1, R2, and the transistors T1 and T2 form a temperature compensated voltage source 11 equal to 1/2 VEE at node VEZ. Transistors T3, T6, T7, and resistor R3 function as a current source 13, for providing current to differential amplifier 15 constituted by transistors T4 and TS. The resistors RX in the differential circuit optimize small signal gains of a feedback loop, so as to increase stability of the circuit. The feedback loop comprises transistors T5, T8, T9 and resistor R4 and function to provide a highly regulated source of voltage V(ref) at terminal 16, for up to approximately 10 milliamps of load current.

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Voltage Reference Supply

This circuit provides a low power internally generated reference voltage for constant-current source requirements. The circuit is powered by a reference voltage supply -VEE applied to terminal 10. The resistors R1, R2, and the transistors T1 and T2 form a temperature compensated voltage source 11 equal to 1/2 VEE at node VEZ. Transistors T3, T6, T7, and resistor R3 function as a current source 13, for providing current to differential amplifier 15 constituted by transistors T4 and TS. The resistors RX in the differential circuit optimize small signal gains of a feedback loop, so as to increase stability of the circuit. The feedback loop comprises transistors T5, T8, T9 and resistor R4 and function to provide a highly regulated source of voltage V(ref) at terminal 16, for up to approximately 10 milliamps of load current.

Bias currents are provided through transistors T5, T12 and T16 and are adjusted by resistors R4, R11, and R12. The ratio of the voltage divider network constituted by resistors R6 over R7 and T15 is selected, such that the voltage generated at node 17 is the absolute value of VB10 = the absolute valu - VEE or approximately 1.0 volt with resistors R6 and R11 of identical value. Resistor R10 provides a current source to the differential amplifier 18 having a pair of transistors T10 and T11. Another feedback loop is provided by resistors R8, transistor T13, T14, resistor R9, transistor T10, T11, and T12. The ratio of R8 to R1...