Abstract: An apparatus comprises a micro-electromechanical system (MEMS) sensor including a first capacitive element and a second capacitive element and an integrated circuit (IC). The IC includes a switch network circuit and a capacitance measurement circuit. The switch network circuit is configured to electrically decouple the first capacitive element of the MEMS sensor from a first input of the IC and electrically couple the second capacitive element to a second input of the IC. The capacitance measurement circuit can be configured to measure capacitance of the second capacitive element of the MEMS sensor during application of a first electrical signal to the decoupled first capacitive element.
Type:
Grant
Filed:
January 16, 2013
Date of Patent:
November 8, 2016
Assignee:
Fairchild Semiconductor Corporation
Inventors:
Jonathan Adam Kleks, Ion Opris, Justin Seng
Abstract: A wireless communication device uses a time-invariant delay-Doppler channel response estimate for received signal demodulation. The device provides coherent signal demodulation by accounting for frequency and time selectivity in a land-based mobile communication environment, which arise mainly because of delay and Doppler shifts, respectively. In one embodiment, the wireless communication device includes a channel estimator that estimates channel response in a wireless communication network by estimating a delay-Doppler response of a wireless communication channel to obtain a delay-Doppler channel response estimate and converting the delay-Doppler channel response estimate to a time-varying channel response estimate, e.g., a time-varying frequency or impulse response. The delay-Doppler response may be estimated in a continuous or discrete domain.
Type:
Grant
Filed:
May 11, 2006
Date of Patent:
June 28, 2011
Assignee:
Telefonaktiebolaget LM Ericsson (publ)
Inventors:
Jiann-Ching Guey, Abdulrauf Hafeez, Dennis Hul
Abstract: An arbitrary function generating circuit incorporating an analog multiplier, amplifier, and frequency multiplier to construct a nonlinear analog circuit equivalent to a generalized Lotka-Volterra equation for performing high-speed calculations.
Type:
Grant
Filed:
January 18, 2001
Date of Patent:
May 24, 2005
Assignee:
National Agriculture and Bio-oriented Research Organization