Invention Grant
- Patent Title: On-chip zero-temperature coefficient current generator
- Patent Title (中): 片上零温系数电流发生器
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Application No.: US13790798Application Date: 2013-03-08
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Publication No.: US08797094B1Publication Date: 2014-08-05
- Inventor: Clyde Washburn , Eric Scott Bohannon , Brian Mott
- Applicant: Synaptics Incorporated
- Applicant Address: US CA Santa Clara
- Assignee: Synaptics Incorporated
- Current Assignee: Synaptics Incorporated
- Current Assignee Address: US CA Santa Clara
- Agency: Patterson & Sheridan, LLP
- Main IPC: G05F1/10
- IPC: G05F1/10

Abstract:
Embodiments of the invention generally provide generating a ZTC current using resistors that may be integrated into an IC, even if these resistors vary with temperature. Specifically, instead of applying a bandgap voltage across a ZTC resistor, the bandgap voltage may be applied to a temperature-dependent resistor to generate a first current that varies (either proportionally or complementary) with temperature. Additionally, a second current may be generated which compensates for the temperature variance of the first current. If the two currents change in the same manner relative to temperature (i.e., the respective slopes of the currents are the same when the underlying circuit elements are exposed to the same temperature variations), the difference between the currents remains constant. Thus, subtracting the two currents, regardless of the current temperature, results in a ZTC current—i.e., a current that is independent of temperature variations.
Information query
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