Invention Grant
- Patent Title: Coupling tolerant precision current reference with high PSRR
- Patent Title (中): 具有高PSRR的耦合容限精密电流基准
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Application No.: US13049673Application Date: 2011-03-16
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Publication No.: US08773170B2Publication Date: 2014-07-08
- Inventor: Brian Williams
- Applicant: Brian Williams
- Applicant Address: US CA Milpitas
- Assignee: Intersil Americas Inc.
- Current Assignee: Intersil Americas Inc.
- Current Assignee Address: US CA Milpitas
- Agency: Vierra Magen Marcus LLP
- Main IPC: H02M11/00
- IPC: H02M11/00 ; G05F1/56

Abstract:
Embodiments of the present invention are related to circuits and methods for generating a reference current (Idc). In an embodiment, a voltage-to-current converter circuit is used to generate the reference current (Idc) in dependence on a reference voltage (Vref) and a precision resistor (R0), wherein Idc=Vref/R0. A capacitor (C0) is used to shunt noise that couples into the voltage-to-current converter. A frequency dependent feedback network is used to compensate for instabilities introduced by the capacitor (C0). The capacitor (C0) can be used to shunt noise that couples into the voltage-to-current converter by connecting the capacitor (C0) in parallel with the precision resistor (R0). The frequency dependent feedback network can be used to compensate for instabilities introduced by the capacitor (C0) by connecting the frequency dependent feedback network between a feedback terminal of an amplifier of the voltage-to-current converter circuit and a terminal of the capacitor (C0).
Public/Granted literature
- US20110241734A1 COUPLING TOLERANT PRECISION CURRENT REFERENCE WITH HIGH PSRR Public/Granted day:2011-10-06
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