John Choma resumes & CV records
Resumes
John Choma
John Choma
John J Choma DeceasedChesapeake, VA
John Choma Phones & Addresses
Chesapeake, VA
Arcade, NY
Tustin, CA
Lolo, MT
Missoula, MT
Clinton, MT
Mentions for John J Choma
Publications & IP owners
Us Patents
Pre-Distortion Apparatus
US Patent:
7844014, Nov 30, 2010
Filed:
Jul 7, 2006
Appl. No.:
11/484008
Inventors:
Arvind Keerthi - Bangalore, IN
Madabusi Govindarajan - Bangalore, IN
P. Vijay Kumar - Bangalore, IN
John Choma - San Dimas CA, US
Abhijit Shanbhag - Sunnyvale CA, US
Madabusi Govindarajan - Bangalore, IN
P. Vijay Kumar - Bangalore, IN
John Choma - San Dimas CA, US
Abhijit Shanbhag - Sunnyvale CA, US
Assignee:
Scintera Networks, Inc. - Sunnyvale CA
International Classification:
H04K 1/02
H04L 25/03
H04L 25/49
H04L 25/03
H04L 25/49
US Classification:
375296, 375285
Abstract:
Pre-distortion apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
Pre-Distortion And Memory Compensation Apparatus
US Patent:
8229027, Jul 24, 2012
Filed:
Oct 21, 2010
Appl. No.:
12/909649
Inventors:
Arvind Keerthi - Bangalore, IN
Madabusi Govindarajan - Bangalore, IN
P. Vijay Kumar - Bangalore, IN
John Choma - San Dimas CA, US
Abhijit Shanbhag - Sunnyvale CA, US
Madabusi Govindarajan - Bangalore, IN
P. Vijay Kumar - Bangalore, IN
John Choma - San Dimas CA, US
Abhijit Shanbhag - Sunnyvale CA, US
Assignee:
Scintera Networks, Inc. - Sunnyvale CA
International Classification:
H04K 1/02
H04L 25/03
H04L 25/49
H04L 25/03
H04L 25/49
US Classification:
375296, 375285
Abstract:
Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.
Npn Operational Amplifier
US Patent:
4468629, Aug 28, 1984
Filed:
May 27, 1982
Appl. No.:
6/363364
Inventors:
John Choma - Hacienda Heights CA
Assignee:
TRW Inc. - Redondo Beach CA
International Classification:
H03F 345
H03F 142
H03F 142
US Classification:
330260
Abstract:
An operational amplifier having an extremely high gain-bandwidth product. The amplifier includes a gain cell with an active negative resistance circuit made up of two matched NPN transistors (18 and 20) with their bases cross-connected to their collectors, and with a differential pair of NPN transistors (14 and 16) having their emitters degenerated through the active negative resistance circuit. The value of the negative resistance is chosen to negate other resistance values in the denominator of a fraction expressing overall amplifier gain, which is therefore maximized. Since no PNP transistors are needed to maximize gain in the amplifier, NPN transistors can be used exclusively, and the amplifier can be more conveniently fabricated in integrated-circuit form, with a desirably wide bandwidth.
Isbn (Books And Publications)
Electrical Networks: Theory And Analysis
Author:
John Choma
ISBN #:
0471085286
Electrical Networks: Theory And Analysis
Author:
John Choma
ISBN #:
0894645536
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