Fang Pei Lu

US Patent:

6445039, Sep 3, 2002

Filed:

Jan 14, 2000

Appl. No.:

09/483551

Inventors:

Agnes N. Woo - Encino CA
Kenneth R. Kindsfater - Irvine CA
Fang Lu - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01L 2972

US Classification:

257355, 257356, 257357, 257360

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.

US Patent:

6459730, Oct 1, 2002

Filed:

Jan 13, 2000

Appl. No.:

09/482699

Inventors:

Henry Samueli - Northridge CA
Fang Lu - Irvine CA
Avanindra Madisetti - Torrance CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 2701

US Classification:

375233, 375350

Abstract:

Digital signals provided by a repeater connected to a plurality of clients by unshielded twisted wire pairs, are converted to analog signals which become degraded during transmission through the wires. Clients convert the degraded analog signals to digital signals. Digital signal phases are coarsely adjusted to have assumed zero crossing times coincide in-time with a clock signal zero crossing. Signal polarity, and the polarity of any change, is determined at the assumed zero crossing times of the digital signals. Pre-cursor and post-cursor responses, resulting from signal degradation, are respectively inhibited by a feed forward and a decision feedback equalizer. The time duration of post-cursor response is further inhibited by a high pass filter and a tail canceller. Phase adjustments are made, after response inhibition, by determining the polarity, and the polarity of any change, at the assumed zero crossing times. Before phase adjustments are made, a phase offset is provided in order to compensate for phase degradations introduced by the unshielded twisted wire pairs.

US Patent:

6711227, Mar 23, 2004

Filed:

Feb 4, 2000

Appl. No.:

09/498162

Inventors:

Tarek Kaylani - Irvine CA
Fang Lu - Irvine CA
Henry Samueli - San Juan Capistrano CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 2540

US Classification:

375372, 375373, 370516, 711149, 711209

Abstract:

To synchronize a regularly occurring pulse train to the average of a bunched pulse train, an oscillator generates a plurality of differently phase shifted signals at a given frequency. One of the phase shifted signals is selected as an output signal. The output signal is compared with the bunched pulse train. The selected phase shifted signal is changed responsive to the comparison so the output signal occurs at the average frequency of the bunched pulse train. The oscillator is formed as a plurality of differential amplifier stages having equal controllable delays. The stages are connected together to form a ring oscillator. The output signal is compared with the bunched pulse train through a FIFO. A signal representative of the state of the FIFO is used as an error signal to control the selection of the phase shifted signal to be used as the output signal. A phase locked loop that synchronizes the phase shifted signal generating oscillator to a frequency reference is nested in the control loop that selects one of the phase shifted signals as the output signal.

US Patent:

6963110, Nov 8, 2005

Filed:

Jul 19, 2002

Appl. No.:

10/198408

Inventors:

Agnes N. Woo - Encino CA, US
Kenneth R. Kindsfater - Irvine CA, US
Fang Lu - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01L029/72

US Classification:

257355, 257356, 257357, 257360, 257546

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 programable attenuation and a programable 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.

US Patent:

7104534, Sep 12, 2006

Filed:

Jul 30, 2001

Appl. No.:

09/916576

Inventors:

Bruce J. Currivan - Irvine CA, US
Jonathan S. Min - Buena Park CA, US
Fang Lu - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

B23Q 3/08

US Classification:

269 32, 269228, 269 27

Abstract:

A system for detecting collisions in a shared communications medium, such as a TDMA medium, includes a receive path adapted to generate a first intermediate signal, a second intermediate signal, and a data symbol sequence from an input signal. A preamble detection module generates a correlation metric from the first intermediate signal. A power measurement module generates a power indication signal from the second intermediate signal. A noise measurement module generates a noise indication signal from the second intermediate signal and the data symbol sequence. A processing module is adapted to characterize the input signal as a collision for certain values of correlation metric, power indication signal, and noise indication signal.

US Patent:

7115952, Oct 3, 2006

Filed:

Jul 1, 2005

Appl. No.:

11/171325

Inventors:

Agnes N. Woo - Encino CA, US
Kenneth R. Kindsfater - Irvine CA, US
Fang Lu - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01L 29/72

US Classification:

257355, 257356, 257357, 257360, 257546

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 programable attenuation and a programable 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.

US Patent:

7136432, Nov 14, 2006

Filed:

Jun 7, 2002

Appl. No.:

10/163309

Inventors:

Jonathan S. Min - Buena Park CA, US
Fang Lu - Irvine CA, US
Bruce J. Currivan - Irvine CA, US
Tom Kwon - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 27/14

US Classification:

375326, 375232, 375316

Abstract:

A method of parameter estimation in a shared channel communications system includes the steps of receiving a preamble including a first sequence corresponding to a sequence having zero autocorrelation, a second sequence having zero autocorrelation, and a third sequence having zero autocorrelation, performing a coarse carrier frequency estimate based on the first sequence, and performing a fine carrier frequency estimate based on the second and third sequences.

US Patent:

7142618, Nov 28, 2006

Filed:

Dec 1, 2003

Appl. No.:

10/724036

Inventors:

Thomas D Kwon - Irvine CA, US
Jonathan S Min - Buena Park CA, US
Fang Lu - Rowland Heights CA, US
Thomas J Kolze - Phoenix AZ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 1/00

US Classification:

375344, 375348, 375233, 375350

Abstract:

A receiver includes a filter for filtering a received signal to produce a filtered signal. A converter converts the filtered signal to a baseband signal that is substantially free of an initial frequency offset and inter-symbol interference (ISI), responsive to a frequency-offset estimate and a restorative signal that compensates for the ISI. A detector detects symbols in the baseband signal to produce a decision signal. A restorative signal generator generates, from the decision signal, the restorative signal responsive to the frequency-offset estimate, such that the restorative signal compensates for the ISI.