Hong L Shi

6819910, Nov 16, 2004

Mar 8, 2002

10/094495

Hong Shi - Redondo Beach CA
Henrik T. Jensen - Long Beach CA

Broadcom Corp. - Irvine CA

H04B 104

455126, 455108, 4551142, 375296, 375298

A radio includes a self-calibrating transmitter that uses a portion of a receiver section to perform self-calibration. Accordingly, the radio includes a transmitter section, mixer, analog receiver section, calibration switch module, digital receiver section, calibration determination module, and calibration execution module. The transmitter section produces a modulated RF signal from base-band signal and a transmitter local oscillation. The mixer mixes the modulated RF signal with the transmitter local oscillation to produce a base-band representation of the modulated RF signal. In calibration mode, the calibration switch module provides the base-band representation to the receiver section, which processes the representation to produce a 2 base-band digital signal. The calibration determination module interprets frequency components of the 2 base-band digital signal to produce a calibration signal that compensates for imbalances within the transmitter.

6868261, Mar 15, 2005

Mar 29, 2002

10/108986

Hong Shi - Redondo Beach CA, US
Frank Carr - Newport Beach CA, US

Broadcom Corporation - Irvine CA

H04B001/04

4551142, 455260, 455 631, 4552781

A translational-loop transmitter includes a local oscillator (LO) generator for generating first and second LO signals, a modulator for generating a modulated reference signal using the second LO signal, and an offset phase-locked-loop (PLL) for phase-locking an output signal to the reference signal, and for tuning the output signal in accordance with the first LO signal. The PLL includes an offset mixer in a feedback path of the PLL, and operates in accordance with a frequency plan that minimizes the effects of on- and off-channel spurs at the output of the offset mixer.

6873832, Mar 29, 2005

Mar 15, 2002

10/098911

Hong Shi - Redondo Beach CA, US

Broadcom Corporation - Irvine CA

H04B001/06
H04B007/00
H04B017/02

4552321, 4552341, 4552342, 4552391, 4552451, 4552491, 375345

A Radio Frequency (RF) receiver includes a low noise amplifier (LNA) and a mixer coupled to the output of the LNA. The gain of the LNA is adjusted to maximize signal-to-noise ratio of the mixer and to force the mixer to operate well within its linear region when an intermodulation interference component is present. The RF receiver includes a first received signal strength indicator (RSSI_A) coupled to the output of the mixer that measures the strength of the wideband signal at that point. A second received signal strength indicator (RSSI_B) couples after the BPF and measures the strength of the narrowband signal. The LNA gain is set based upon these signal strengths. LNA gain is determined during a guard period preceding an intended time slot of a current frame and during a guard period following an intended time slot of a prior frame. The lesser of these two LNA gains is used for the intended time slot of the current frame.

6882831, Apr 19, 2005

Feb 4, 2002

10/066843

Hong Shi - Redondo Beach CA, US
Henrik Tholstrup Jensen - Long Beach CA, US

Broadcom Corporation - Irvine CA

H01Q011/12

455116, 4551151, 455126

A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at the translational loop output. The RF transmitter includes an Intermediate Frequency (IF) modulator, a translational loop, an envelope time delay adjust block, an envelope adjust block, and a time delay calibration block. The IF modulator receives a modulated baseband signal and produces a modulated IF signal having a non-constant envelope. The translational loop receives the modulated IF signal and produces a modulated RF signal having a constant envelope. The envelope time delay adjust block receives an envelope signal corresponding to the original modulated signal and produces a time delayed envelope signal based upon a time delay control signal. The envelope adjust block adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal. Finally, the time delay calibration block receives the envelope adjusted modulated RF signal and produces the time delay control signal.

6980774, Dec 27, 2005

Mar 21, 2002

10/103365

Hong Shi - Redondo Beach CA, US

Broadcom, Corp. - Irvine CA

H04B001/38

455 73, 455 84, 455 86, 455118, 4552341, 455257, 4552761, 455295, 455296, 455310, 455313, 455314, 455317, 455324, 455333, 375316, 375317, 375318, 375319, 375320, 375321, 375322, 375133, 375222, 375281

A radio frequency (RF) integrated circuit (IC) includes a local oscillation module, analog radio receiver, analog radio transmitter, digital receiver module, digital transmitter module, and digital optimization module. The local oscillation module is operably coupled to produce at least one local oscillation. The analog radio receiver is operably coupled to directly convert inbound RF signals into inbound low intermediate frequency signals based on the local oscillation. The digital receiver module is operably coupled to process the inbound low IF signals in accordance with one of a plurality of radio transceiving standards to produce inbound data. The digital transmitter is operably coupled to produce an outbound low intermediate frequency signal by processing outbound data in accordance with the one of the plurality of radio transceiving standards. The analog radio transmitter is operably coupled to directly convert the outbound low IF signals into outbound RF signals based on the local oscillation. The digital optimization module is operably coupled to the local oscillation module, the analog radio receiver and/or the analog radio transmitter to optimize performance of at least one aspect of the local oscillation module, the analog radio receiver and/or the analog radio transmitter for the given radio transceiving standard being implemented.

7031676, Apr 18, 2006

Apr 17, 2002

10/124518

Hong Shi - Redondo Beach CA, US

Broadcom Corporation - Irvine CA

H04Q 11/12
H04B 1/04

455126, 4551275

A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at the translational loop output. The RF transmitter includes a phase equalizer, an Intermediate Frequency (IF) modulator, a translational loop, an envelope time delay adjust block, an envelope adjust block, and a time delay calibration block. The phase equalizer receives a modulated baseband signal and phase equalizes the modulated baseband signal to produce a phase equalized modulated baseband signal. The IF modulator receives the phase equalized modulated baseband signal and produces a modulated IF signal having a non-constant envelope. The translational loop receives the modulated IF signal and produces a modulated RF signal having a constant envelope. The envelope time delay adjust block receives an envelope signal corresponding to the original modulated signal and produces a time delayed envelope signal based upon a time delay control signal.

7110469, Sep 19, 2006

Mar 8, 2002

10/094587

Hong Shi - Redondo Beach CA, US
Henrik T. Jensen - Long Beach CA, US

Broadcom Corporation - Irvine CA

H04L 27/04

375295, 375296, 375224, 455126, 244118

A self-calibrating transmitter includes an up-conversion mixing module, summing module, calibration determination module, and a calibration execution module. The up-conversion mixing module is operably coupled to mix an I component of a base-band signal with an I component of a local oscillation to produce a mixed I signal and is also operably coupled to mix a Q component of the base-band signal with a Q component of the local oscillation to produce a mixed Q signal. The summing module sums the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal. The calibration determination module is operably coupled to produce a calibration signal, which it generates by interpreting the local oscillation and the modulated RF signal. The calibration execution module is operably coupled to calibrate the DC level of the I and/or Q component of the base-band signal, and/or the gain of the I and/or Q component of the base-band signal based on the calibration signal.

7120410, Oct 10, 2006

Sep 28, 2001

09/966060

Hong Shi - Redondo Beach CA, US

Broadcom Corporation - Irvine CA

H04B 17/00

4552262, 4552341, 4552342, 4552391, 4552401, 4552451, 4552501, 455283, 455295, 455296, 370347, 375345

A Radio Frequency (RF) receiver includes a low noise amplifier (LNA) and a mixer coupled to the output of the LNA. The gain of the LNA is adjusted to maximize signal-to-noise ratio of the mixer and to force the mixer to operate well within its linear region when an intermodulation interference component is present. The RF receiver includes a first received signal strength indicator (RSSI_A) coupled to the output of the mixer that measures the strength of the wideband signal at that point. A second received signal strength indicator (RSSI_B) couples after the BPF and measures the strength of the narrowband signal. The LNA gain is set based upon these signal strengths. By altering the gain of the LNA by one step and measuring the difference between a prior RSSI_B reading and a subsequent RSSI_B′ reading will indicate whether intermodulation interference is present.