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Title: Gm-C filter and multi-phase clock circuit

Patent ·
OSTI ID:1496593
; ;

Described herein is a power-efficient Gm-C filter, wherein the Gm-C filter includes several operational transconductance amplifiers (OTAs). In an example, at least two of the OTAs share a common bias current. Further, output of one of the OTAs is used to bias another one of the OTAs. Also described herein is a power-efficient clock generator circuit that is configured to output non-overlapping clock signals. The clock generator circuit includes a ring oscillator circuit, which includes several inverter stages. The clock generator circuit is well-suited for controlling operation of switches.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-94AL85000
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
Patent Number(s):
10,181,840
Application Number:
14/828,688
OSTI ID:
1496593
Resource Relation:
Patent File Date: 2015 Aug 18
Country of Publication:
United States
Language:
English

References (15)

Operational transconductance amplifier for use in sample-and-hold circuits and the like patent November 1988
Chopper-stabilized operational transconductance amplifier patent March 1990
Fully-differential relaxation-type voltage controlled oscillator and method therefor patent March 1993
Compatible signal encode/decode system patent December 1995
Current controlled variable frequency oscillator having an improved operational transconductance amplifier patent October 1996
Common transmit module for a programmable digital radio patent February 1999
Low power precision voltage splitter patent March 1999
Filter circuit patent May 2001
Strong-motion seismological accelerometer system patent April 2004
Gm-C time constant tuning circuit patent July 2007
High linearity gmC filter patent July 2010
Cutoff frequency adjusting method, GmC filter circuit and semiconductor device patent July 2010
Directional anti-aliasing filter patent March 2013
Variable frequency charge pump patent February 2016
Stability controlled high frequency chopper-based oscillator patent January 2017

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