Joseph G Andrews

US Patent:

6433644, Aug 13, 2002

Filed:

Jun 20, 2001

Appl. No.:

09/887912

Inventors:

Joseph Andrews - San Marcos CA

Assignee:

Denso Corporation - Kariya

International Classification:

H03B 508

US Classification:

331 10, 331 16, 331 17, 331 36 C, 331117 R, 331177 V

Abstract:

A frequency oscillator tuning process at the manufacturing stage is replaced with an adjustment of a resonant circuit in the frequency oscillator during an operation of the oscillator. The adjustment utilizes a crystal oscillator, a frequency oscillator such as a voltage-controlled oscillator (VCO), and a trimmer in a phase-locked loop configuration to determine a correction voltage required for an untrimmed VCO to operate at a nominally specified frequency by adjusting an input tuning voltage for a resonant circuit.

US Patent:

6509806, Jan 21, 2003

Filed:

Jun 20, 2001

Appl. No.:

09/887227

Inventors:

Joseph Andrews - San Marcos CA

Assignee:

Denso Corporation - Kariya

International Classification:

H03B 520

US Classification:

331117R, 331117 FE, 331108 R

Abstract:

A frequency oscillator tuning process at the manufacturing stage is replaced with an adjustment of a resonant circuit in the frequency oscillator during an operation of the oscillator. The adjustment utilizes a crystal oscillator, a frequency oscillator such as a voltage-controlled oscillator (VCO), and a trimmer in a phase-locked loop configuration to determine a correction voltage required for an untrimmed VCO to operate at a nominally specified frequency by adjusting an input tuning voltage for a resonant circuit.

US Patent:

6522878, Feb 18, 2003

Filed:

Apr 7, 1999

Appl. No.:

09/288043

Inventors:

Joseph Andrews - San Marcos CA
Todd H. Evans - San Diego CA
Mark VanHoorebeke - Vista CA
Lowell Campbell - Carlsbad CA

Assignee:

Denso Corporation - Kariya

International Classification:

H04Q 720

US Classification:

455425, 455563, 4552264

Abstract:

The vocoder in a digital cellular phone is used to create a status message indicating something that is happening in the cellular phone. That message can be noise, beeps, voice or other information. That information is played to the user to indicate the condition.

US Patent:

62530704, Jun 26, 2001

Filed:

Jul 22, 1998

Appl. No.:

9/121202

Inventors:

Joseph Andrews - San Marcos CA

Assignee:

Denso Corporation - Aichi-ken

International Classification:

H04B 118

US Classification:

455287

Abstract:

RF circuit includes an amplifier and a shunt. The shunt is controlled to provide a path around the amplifier for avoiding intermodulation distortion caused by overdriving the amplifier. The shunt is formed by a diode with capacitors that match to the RF characteristics.