Invention Application
- Patent Title: Temperature independent reference circuit
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Application No.: US12931377Application Date: 2011-01-31
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Publication No.: US20110121889A1Publication Date: 2011-05-26
- Inventor: David Kung , Leif Lund
- Applicant: David Kung , Leif Lund
- Applicant Address: US CA San Jose
- Assignee: Power Integrations, Inc.
- Current Assignee: Power Integrations, Inc.
- Current Assignee Address: US CA San Jose
- Main IPC: G05F1/10
- IPC: G05F1/10

Abstract:
A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.
Public/Granted literature
- US07999606B2 Temperature independent reference circuit Public/Granted day:2011-08-16
Information query
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