Hea R Kim

US Patent:

6829550, Dec 7, 2004

Filed:

Sep 26, 2002

Appl. No.:

10/255402

Inventors:

Hea Joung Kim - El Segundo CA

Assignee:

Broadcom Corp. - Irvine CA

International Classification:

G06F 1900

US Classification:

702107, 455 85, 4552451

Abstract:

Calibration of received signal strength indication (RSSI) within a radio frequency integrated circuit (RFIC) begins by concurrently enables a transmitter portion and receiver portion. With both the transmitter and receiver enabled, the RFIC provides a zero input to the transmitter portion, where the zero input is an effective zero input based on the input circuitry of the transmitter portion. The RFIC then measures, via the receiver portion, the received signal strength of the RF signal generated by the transmitter portion regarding the zero input signal. The RFIC then compares the measured received signal strength with a desired zero input signal strength value. If the measured received signal strength compares unfavorably with the desired zero input signal strength value (e. g. , differ by more than a few percentage points), the received signal strength to power level table within the RFIC, which is used to convert a measured voltage into a dBm value, is scaled based on the difference between the measured received signal strength and the desired zero input signal strength value.

US Patent:

6914437, Jul 5, 2005

Filed:

Aug 21, 2003

Appl. No.:

10/645130

Inventors:

Brima B. Ibrahim - Aliso Viejo CA, US
Hea Joung Kim - Los Angeles CA, US

Assignee:

Broadcom Corp. - Irvine CA

International Classification:

G01R027/28

US Classification:

324616, 455340

Abstract:

A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region of the filter. The processing continues by measuring signal strength of the first filtered signal to produce a first measured signal strength. The processing continues with the filter filtering a second signal having a second frequency to produce a second filtered signal, wherein the second frequency is at a desired corner frequency of the filter. The processing continues by measuring signal strength of the second filtered signal to produce a second measured signal strength. The processing continues by comparing the first measured signal strength with the second measured signal strength to determine whether the filter has attenuated the second signal by a desired attenuation value with respect to the first signal. The processing continues by adjusting filter response of the filter to produce an adjusted filter response when the filter has not attenuated the second signal by the desired attenuation value with respect to the first signal.

US Patent:

6998922, Feb 14, 2006

Filed:

Sep 8, 2003

Appl. No.:

10/657434

Inventors:

Henrik T. Jensen - Long Beach CA, US
Hea Joung Kim - Los Angeles CA, US

Assignee:

Broadcom Corp. - Irvine CA

International Classification:

H03L 7/08
H03L 7/099

US Classification:

331 17, 331 14, 331 16, 331 18, 331 25

Abstract:

A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a charge pump of the phase locked loop based on the gain offset.

US Patent:

6999744, Feb 14, 2006

Filed:

Sep 26, 2002

Appl. No.:

10/255258

Inventors:

Hea Joung Kim - El Segundo CA, US

Assignee:

Broadcom Corp - Irvine CA

International Classification:

H04B 1/10

US Classification:

455310, 455323, 455296, 455 78, 375296

Abstract:

The measuring of local oscillation leakage in radio frequency integrated circuits (RFICs) begins by concurrently enabling a transmitter portion and a receiver portion of a radio frequency integrated circuit. The processing then continues by providing a zero input to the transmitter portion such that information contained in the RF signals corresponds to local oscillation leakage produced by the transmitter portion. The processing continues by detecting the concurrent enablement of the transmitter and receiver portions. The processing continues by measuring, via the receiver portion, the received signal strength of the RF signals. The processing continues by processing the received signal strength over a predetermined period of time commencing upon the detection of the concurrent enablement to obtain a measure of the local oscillation leakage.

US Patent:

7095992, Aug 22, 2006

Filed:

Dec 19, 2003

Appl. No.:

10/742489

Inventors:

Hea Joung Kim - Los Angeles CA, US
Brima B. Ibrahim - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/18
H04B 17/00
H04B 1/40

US Classification:

4551803, 455260, 4552261, 455 6711, 455 76

Abstract:

A method for calibrating a phase locked loop (PLL) includes an open loop test and a closed loop test. The open loop test includes providing an optimal control input to a controlled oscillator (CO) of the PLL; determining rate of output oscillation of the CO based on the optimal control input; comparing the rate of the output oscillation with rate of an optimal output oscillation; and when the comparing the rate of the output oscillation with rate of the optimal output oscillation is unfavorable, adjusting an oscillation point of the CO until the comparing is favorable to produce an open-loop adjusted CO oscillation point. The close loop test includes determining a closed-loop input control level of the CO at the open-loop adjusted CO oscillation point; comparing the closed-loop input control level with the optimal control input; and when the comparing the closed-loop input control level with the optimal control input is not favorable, adjusting the open-loop adjusted CO oscillation point until the comparing is favorable.

US Patent:

7127222, Oct 24, 2006

Filed:

Jun 28, 2004

Appl. No.:

10/879244

Inventors:

Hea Joung Kim - Los Angeles CA, US
Paul Anthony Lettieri - Lake Forest CA, US
Brima B. Ibrahim - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/16

US Classification:

4552321, 4552342, 375345

Abstract:

A method for adjusting automatic gain control of a radio receiver begins by determining power level of a radio frequency (RF) signal received by the radio receiver to produce a determined power level. The method then continues by comparing the determined power level with a plurality of power thresholds to determine whether an automatic gain adjustment is needed. The method then continues, when the automatic gain adjustment is needed, by determining, from the comparing the determined power level with the plurality of power thresholds, a sign of the automatic gain adjustment. The method continues by determining, from the comparing the determined power level with the plurality of power thresholds, a magnitude of the automatic gain adjustment. The method continues by addressing a gain adjustment look up table for at least a portion of the radio receiver based on the magnitude to produce a gain setting. The method then continues by adjusting the automatic gain of the radio receiver based on the sign of the automatic gain adjustment and the gain setting.

US Patent:

7345490, Mar 18, 2008

Filed:

May 3, 2005

Appl. No.:

11/120608

Inventors:

Brima B. Ibrahim - Aliso Viejo CA, US
Hea Joung Kim - Los Angeles CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G01R 27/28
H04B 15/00

US Classification:

324616, 702190

Abstract:

A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region of the filter. The processing continues by measuring signal strength of the first filtered signal to produce a first measured signal strength. The processing continues with the filter filtering a second signal having a second frequency to produce a second filtered signal, wherein the second frequency is at a desired corner frequency of the filter. The processing continues by measuring signal strength of the second filtered signal to produce a second measured signal strength. The processing continues by comparing the first measured signal strength with the second measured signal strength to determine whether the filter has attenuated the second signal by a desired attenuation value with respect to the first signal. The processing continues by adjusting filter response of the filter to produce an adjusted filter response when the filter has not attenuated the second signal by the desired attenuation value with respect to the first signal.

US Patent:

7375595, May 20, 2008

Filed:

Sep 29, 2006

Appl. No.:

11/540878

Inventors:

Louie Serrano - Irvine CA, US
Alireza Zolfaghari - Irvine CA, US
Paul Lettieri - Lake Forest CA, US
Hea Joung Kim - Irvine CA, US
Hooman Darabi - Irvine CA, US
Henrik Jensen - Long Beach CA, US
Behnam Mohammadi - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03L 7/08
H03L 7/099

US Classification:

331 44, 331 16, 331 17

Abstract:

Methods and apparatus for calibrating a transitional loop, such as a phase locked loop, are disclosed. An example method includes performing an open loop calibration of a voltage controlled oscillator (VCO). The open loop calibration includes tuning the output oscillation frequency of the VCO to within a predetermined range of frequencies. The example method further includes determining a voltage offset and a gain error of an analog to digital converter (ADC) coupled with the phase locked loop. The example method also includes determining a gain offset of the open loop calibrated VCO using the voltage offset and the gain error of the ADC. In the example method, a signal provided by a charge pump of the PLL is adjusted based on the determined gain offset.

Address:

219 S Ln Fayette Park Pl, Los Angeles, CA 90057

Phone:

(213)7440887

VIN:

JTHBF5C27B5150905

Make:

LEXUS

Model:

IS 250

Year:

2011