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:

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:

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:

6838947, Jan 4, 2005

Filed:

May 23, 2003

Appl. No.:

10/443741

Inventors:

Ramon A. Gomez - San Juan Capistrano CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03L 700

US Classification:

331 17, 331 36 C

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:

6847282, Jan 25, 2005

Filed:

Oct 19, 2001

Appl. No.:

09/981993

Inventors:

Ramon A. Gomez - San Juan Capistrano CA, US
Lawrence M. Burns - Laguna Hills CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01F 500

US Classification:

336200, 336 83, 336 84 R, 336 84 C, 336232

Abstract:

A multiple layer inductor has a first spiral conductive pattern disposed on a first surface; a second spiral conductive pattern disposed on a second surface; a continuing interconnection coupled to the first and second spiral conductive patterns; an interface coupled to the first and second spiral conductive patterns; and a conductive shield pattern disposed on a third surface that is adjacent to the second surface. The interface includes a first terminal disposed on the first surface that is coupled to the first spiral conductive pattern. The interface also includes a second terminal that is disposed on the first surface and coupled to said second spiral conductive pattern.

US Patent:

6879816, Apr 12, 2005

Filed:

Nov 12, 1999

Appl. No.:

09/438687

Inventors:

Klaas Bult - Bosch en Duin, NL
Ramon A. Gomez - San Juan Capistrano CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B007/00

US Classification:

4552321, 4552341, 330284, 333 81 R

Abstract:

An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.