Resumes
Resumes
Fazil Ahmad Phones & Addresses
-
Fremont, CA
Publications
Us Patents
Apparatus And Methods For Electronic Amplification
View pageUS Patent:
20130335141, Dec 19, 2013
Filed:
Jun 13, 2012
Appl. No.:
13/495929
Inventors:
Fazil Ahmad - Santa Clara CA, US
Assignee:
Analog Devices, Inc. - Norwood MA
International Classification:
H03F 3/45
US Classification:
330 69
Abstract:
Apparatus and methods for electronic amplification are provided. In one embodiment, a method of electronic amplification includes amplifying a differential input voltage signal to generate a feed-forward signal, chopping the feed-forward signal at a chopping frequency to generate a chopped feed-forward signal, notch filtering the chopped feed-forward signal at the chopping frequency to generate a notched signal, generating an input offset correction signal based at least partly on the notched signal, and amplifying the differential input voltage signal using a signal amplification block to generate an output signal. Amplifying the differential input voltage signal using the signal amplification block includes chopping the input signal at the chopping frequency to generate a chopped input signal and combining the chopped input signal and the offset correction signal to reduce input offset error of the signal amplification block.
Apparatus And Methods For Notch Filtering
View pageUS Patent:
20130335144, Dec 19, 2013
Filed:
Jun 13, 2012
Appl. No.:
13/495895
Inventors:
Fazil Ahmad - Santa Clara CA, US
Assignee:
Analog Devices, Inc. - Norwood MA
International Classification:
H03F 3/45
US Classification:
330252
Abstract:
Apparatus and methods for notch filtering are provided. In certain implementations, an amplifier includes amplification stages for providing signal amplification, chopper circuitry for generating a chopped signal by chopping an amplified signal associated with the amplification stages at a chopping frequency, and a time-interleaved finite impulse response (FIR) notch filter for notching frequency components of the chopped signal near the chopping frequency. The time-interleaved FIR notch filter includes a plurality of FIR filters configured to sample the chopped signal at a sampling rate of about twice the chopping frequency. The FIR filters are interleaved in time to reduce sampling error. Additionally, the time-interleaved FIR notch filter includes an infinite impulse response (IIR) filter configured to average samples taken by respective ones of the FIR filters and to integrate the averaged samples to generate the time-interleaved FIR notch filter's output signal.