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Pin-Selectable Regulated Voltage Generator

IP.com Disclosure Number: IPCOM000042392D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Riggio, SR: AUTHOR

Abstract

Two different regulated output voltage levels can be obtained from the same regulated voltage generator by connecting or disconnecting a jumper between generator input/output pins. No external components are required and a minimum number of substrate resistors and input/output pins are needed. The regulated output voltage level of the illustrated voltage generator is changed by changing the resistor values in a feedback network which supplies a feedback voltage back to the control signal input of the voltage generator. Feedback network resistors R1, R2 and R3 are thick film, laser-active trimmed resistors which are permanently formed on the same substrate as are the circuit components for the voltage generator. The laser-active trimming provides the required accuracy.

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Pin-Selectable Regulated Voltage Generator

Two different regulated output voltage levels can be obtained from the same regulated voltage generator by connecting or disconnecting a jumper between generator input/output pins. No external components are required and a minimum number of substrate resistors and input/output pins are needed. The regulated output voltage level of the illustrated voltage generator is changed by changing the resistor values in a feedback network which supplies a feedback voltage back to the control signal input of the voltage generator. Feedback network resistors R1, R2 and R3 are thick film, laser-active trimmed resistors which are permanently formed on the same substrate as are the circuit components for the voltage generator. The laser-active trimming provides the required accuracy. Resistors R1 and R2 are permanently connected to the voltage generator, as shown, and provide a first regulated output level. A second and different regulated output level is obtained by connecting a jumper between the regulated output voltage pin and a control voltage pin. This places R3 in parallel with R1 and serves to modify the gain of the feedback network. R3 is laser-active trimmed to accurately provide the desired second regulated output level.

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