skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Supply-noise-rejecting current source

Abstract

Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed-back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and cause the output of the current source to remain substantially constant.

Inventors:
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1632584
Patent Number(s):
10566936
Application Number:
16/016,818
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
Patent Classifications (CPCs):
G - PHYSICS G05 - CONTROLLING G05F - SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS
DOE Contract Number:  
NA0003525
Resource Type:
Patent
Resource Relation:
Patent File Date: 06/25/2018
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Wessendorf, Kurt O. Supply-noise-rejecting current source. United States: N. p., 2020. Web.
Wessendorf, Kurt O. Supply-noise-rejecting current source. United States.
Wessendorf, Kurt O. Tue . "Supply-noise-rejecting current source". United States. https://www.osti.gov/servlets/purl/1632584.
@article{osti_1632584,
title = {Supply-noise-rejecting current source},
author = {Wessendorf, Kurt O.},
abstractNote = {Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed-back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and cause the output of the current source to remain substantially constant.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {2}
}

Patent:

Save / Share:

Works referenced in this record:

Current source apparatus for reducing interference with noise
patent, March 2009


Current source circuit with complementary current mirrors
patent, February 1991


Method and apparatus for improving power supply rejection in amplifier rail to rail output stages
patent, December 2001


Bidirectional voltage to current converter
patent, November 1993


Current amplifiers
patent, May 1995


Amplifier having an active current source
patent, January 1998


Increasing the linearity of a transconductance cell
patent, November 2007


Low GM transconductor
patent, September 2014