Hea J Kim

6829550, Dec 7, 2004

Sep 26, 2002

10/255402

Hea Joung Kim - El Segundo CA

Broadcom Corp. - Irvine CA

G06F 1900

702107, 455 85, 4552451

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.

6914437, Jul 5, 2005

Aug 21, 2003

10/645130

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

Broadcom Corp. - Irvine CA

G01R027/28

324616, 455340

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.

6998922, Feb 14, 2006

Sep 8, 2003

10/657434

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

Broadcom Corp. - Irvine CA

H03L 7/08
H03L 7/099

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

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.

6999744, Feb 14, 2006

Sep 26, 2002

10/255258

Hea Joung Kim - El Segundo CA, US

Broadcom Corp - Irvine CA

H04B 1/10

455310, 455323, 455296, 455 78, 375296

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.

7095992, Aug 22, 2006

Dec 19, 2003

10/742489

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

Broadcom Corporation - Irvine CA

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

4551803, 455260, 4552261, 455 6711, 455 76

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.

7127222, Oct 24, 2006

Jun 28, 2004

10/879244

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

Broadcom Corporation - Irvine CA

H04B 1/16

4552321, 4552342, 375345

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.

7345490, Mar 18, 2008

May 3, 2005

11/120608

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

Broadcom Corporation - Irvine CA

G01R 27/28
H04B 15/00

324616, 702190

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.

7349680, Mar 25, 2008

Apr 8, 2005

11/101961

Brima Ibrahim - Aliso Viejo CA, US
Hea Joung Kim - Irvine CA, US
Henrik Tholstrup Jensen - Long Beach CA, US
Siukai Mak - Poway CA, US

Broadcom Corporation - Irvine CA

H04B 1/26

455260, 455318, 375319

In RF transceivers, a method and system for using phase shift key (PSK) sync word for fine tuning frequency adjustment are provided. One aspect of the invention provides for adjusting a local oscillator frequency in a radio frequency (RF) receiver when a residual DC offset remains after a coarse frequency offset adjustment if performed. The fine adjustment may be necessary because of the synchronization required with a PSK-based modulated portion of a Bluetooth packet. A residual phase shift detected in a sync sequence portion of the Bluetooth packet may be utilized to determine a residual or fine frequency adjustment. This approach may allow an RF receiver to operate, in some instances, without the need for an equalizer. In this regard, the power consumed by the RF receiver may be minimized and/or the overall cost of the RF receiver may be reduced.