Ramon Gomez

US Patent:

6437652, Aug 20, 2002

Filed:

Feb 15, 2001

Appl. No.:

09/783033

Inventors:

Ramon A. Gomez - San Juan Capistrano CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 500

US Classification:

331116FE, 331105, 331116 R, 331117 R, 331158, 331175

Abstract:

A resonant oscillator circuit includes an active device and a resonator that causes the active device to oscillate at a resonant frequency of the resonator. The active device includes one or more transistors that are DC biased using one or more resistors. The bias resistors generate thermal noise that is proportional to the resistance value. An external inductor circuit is connected across the output terminals of the active device and in parallel with the resonator. The external inductor circuit shorts-out at least some of the thermal noise that is generated by the bias resistors, and thereby reduces the overall phase noise of the resonant oscillator.

US Patent:

6472940, Oct 29, 2002

Filed:

Nov 13, 2000

Appl. No.:

09/712422

Inventors:

Arya R. Behzad - Danville CA
Klaas Bult - Boschen Duin, NL
Ramon A. Gomez - Fountain Valley CA
Chi-Hung Lin - Mission Viejo CA
Tom W. Kwan - Cupertino CA
Oscar E. Agazzi - Irvine CA
John L. Creigh - Rancho Santa CA
Mehdi Hatamian - Mission Viejo CA
David E. Kruse - Bunnik, NL
Arthur Abnous - Irvine CA
Henry Samueli - Corona del Mar CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G03G 310

US Classification:

330279, 330144

Abstract:

Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductors switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.

US Patent:

6583675, Jun 24, 2003

Filed:

Mar 20, 2001

Appl. No.:

09/811611

Inventors:

Ramon A. Gomez - San Juan Capistrano CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03L 700

US Classification:

331 17, 331 8

Abstract:

A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit according to a capacitor control signal to perform band-select tuning of the VCO. The gain compensator compensates for the variable VCO gain by generating a charge pump reference current that is based on the same capacitor control signal that controls the fixed capacitors in the LC circuit. The gain compensator generates the charge pump reference current by replicating a reference scale current using unit current sources. The number of times the reference scale current is replicated is based on the fixed capacitance that is switched-in to the LC circuit and therefore the frequency band of the PLL. The reference scale current is generated based on a PLL control that specifics certain PLL characteristics such as reference frequency, loop bandwidth, and loop damping. Therefore, the reference pump current can be efficiently optimized for changing PLL operating conditions, in addition to compensating for variable VCO gain.

US Patent:

6639478, Oct 28, 2003

Filed:

Jul 22, 2002

Appl. No.:

10/199113

Inventors:

Ramon A. Gomez - San Juan Capistrano CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 500

US Classification:

331116F, 331105, 331116 R, 331117 R, 331158, 331175

Abstract:

A resonant oscillator circuit includes an active device and a resonator that causes the active device to oscillate at a resonant frequency of the resonator. The active device includes one or more transistors that are DC biased using one or more resistors. The bias resistors generate thermal noise that is proportional to the resistance value. An external inductor circuit is connected across the output terminals of the active device and in parallel with the resonator. The external inductor circuit short-out at least some of the thermal noise that is generated by the bias resistors, and thereby reduces the overall phase noise of the resonant oscillator.

US Patent:

6724335, Apr 20, 2004

Filed:

Jun 3, 2003

Appl. No.:

10/452211

Inventors:

Ramon A. Gomez - San Juan Capistrano CA
Donald McMullin - Laguna Hills CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 166

US Classification:

341144, 455112, 455118

Abstract:

Systems and methods for digital upconversion of baseband television signals that can be used in cable television headend systems are provided. In one embodiment, the system includes a digital frequency adjustment system and a digital to analog conversion system. In a feature of the embodiment, the digital frequency adjustment system consists of set of digital upconversion and upsample elements that shift upwards the frequency of baseband signals. In a further feature of the embodiment, a tree structure of sets of upsample and upconversion elements is used. In another embodiment, the system includes digital and analog frequency adjustment systems in which the frequencies of the input signals are partially upshifted within both the digital and analog domains. Methods for digital upconversion of television signals are also provided.

US Patent:

6798283, Sep 28, 2004

Filed:

Oct 28, 2003

Appl. No.:

10/695091

Inventors:

Arya R. Behzad - Danville CA
Klaas Bult - LK Boschen Duin, NL
Ramon A. Gomez - Fountain Valley CA
Chi-Hung Lin - Houten, NL
Tom W. Kwan - Cupertino CA
Oscar E. Agazzi - Irvine CA
John L. Creigh - Rancho Santa Margarita CA
Mehdi Hatamian - Coto de Caza CA
David E. Kruse - AJ Bunnik, NL
Arthur Abnous - Irvine CA
Henry Samueli - Corona del Mar CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03F 114

US Classification:

330 51, 330124 R

Abstract:

Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.

US Patent:

6798304, Sep 28, 2004

Filed:

Oct 24, 2003

Appl. No.:

10/692001

Inventors:

Ramon A. Gomez - San Juan Capistrano CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 500

US Classification:

331116FE, 331105, 331116 R, 331117 R, 331158, 331175

Abstract:

A resonant oscillator circuit includes an active device and a resonator that causes the active device to oscillate at a resonant frequency of the resonator. The active device includes one or more transistors that are DC biased using one or more resistors. The bias resistors generate thermal noise that is proportional to the resistance value. An external inductor circuit is connected across the output terminals of the active device and in parallel with the resonator. The external inductor circuit shorts-out at least some of the thermal noise that is generated by the bias resistors, and thereby reduces the overall phase noise of the resonant oscillator.

US Patent:

6828860, Dec 7, 2004

Filed:

Oct 28, 2003

Appl. No.:

10/695099

Inventors:

Arya R. Behzad - Danville CA
Klaas Bult - LK Boschen Duin, NL
Ramon A. Gomez - Fountain Valley CA
Chi-Hung Lin - Mission Viejo CA
Tom W. Kwan - Cupertino CA
Oscar E. Agazzi - Irvine CA
John L. Creigh - Rancho Santa CA
Mehdi Hatamian - Mission Viejo CA
David E. Kruse - AJ Bunnik, NL
Arthur Abnous - Irvine CA
Henry Samueli - Corona del Mar CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03G 310

US Classification:

330284, 330 51

Abstract:

Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.