TIMOTHY KEITH COFFMAN
Pilots at Augusta Ave, Chandler, AZ
License number
Arizona A2482775
Issued Date
Aug 2015
Expiration Date
Aug 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
2610 E Augusta Ave, Chandler, AZ 85249
Professional information
Variable Gain Control Circuit For A Receiver And Method Therefor
US Patent:
6400218, Jun 4, 2002
Filed:
Feb 29, 2000
Appl. No.:
09/515824
Inventors:
Andrew G. Zocher - Spring Grove IL
Timothy K. Coffman - Chandler AZ
Joseph P. Heck - Ft. Lauderdale FL
Timothy K. Coffman - Chandler AZ
Joseph P. Heck - Ft. Lauderdale FL
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
G06G 726
US Classification:
327560, 330282
Abstract:
A variable gain control circuit ( ) includes a programmable operational transconductance amplifier (OTA) circuit ( ) and a programmable conveying circuit ( ). The conveying circuit ( ) has a programmable differential circuit ( ) interconnected to a pair of programming inputs ( ). The pair of programming inputs ( ) is interconnected to a pair of programming inputs ( ) that set the gain of the OTA circuit ( ). When the OTA circuit ( ) is configured as an operational transconductance filter ( ), the programmable differential circuit ( ) can adjust the gain of the conveying circuit ( ) to compensate for changes in the input impedance of the filter ( ). The programming inputs ( ) that set the input impedance and bandwidth of the filter ( ) also control the amount of signal current transmitted by the conveying circuit ( ).
Gaas Rf Signal Detection Circuit With Operational Amplifier
US Patent:
7171171, Jan 30, 2007
Filed:
Jun 21, 2004
Appl. No.:
10/872660
Inventors:
Timothy K. Coffman - Chandler AZ, US
Tracy S. Martin - Phoenix AZ, US
Michael S. LaBelle - Phoenix AZ, US
Tracy S. Martin - Phoenix AZ, US
Michael S. LaBelle - Phoenix AZ, US
Assignee:
RF Micro Devices, Inc. - Greensboro NC
International Classification:
H04B 1/04, H03G 3/20
US Classification:
455126, 4551271, 4551151, 455 91, 330140, 330129
Abstract:
A mobile terminal senses transmitted power in a Gallium Arsenide (GaAs) circuit. The GaAs circuit provides a steady reference voltage through the use of an operational amplifier and feedback circuit. The operational amplifier drives the bases of two transistors to create balanced signals that are then used by a detection circuit.