Cormac S Conroy

6459684, Oct 1, 2002

Feb 16, 1999

09/250426

Cormac S. Conroy - Sunnyvale CA
Samuel W. Sheng - Santa Clara CA
Gregory T. Uehara - Honolulu HI

LSI Logic Corporation - Milpitas CA

H04B 320

370286, 370494, 370208, 379410

An ADSL central office transmission system for transmitting downstream DMT signals to a plurality of remote ADSL transceiver is disclosed. The system includes a DMT digital signal transceiver that generates a time division multiplexed digital signal that includes a plurality of DMT signals to be sent on a plurality of ADSL lines. A digital to analog converter converts the time division multiplexed digital signal into a time division multiplexed analog signal that includes a plurality of analog DMT signals. The analog to digital converter has an output that outputs the time division multiplexed analog signal. A switch selectively connects the output of the digital to analog converter to each of a plurality of transmitters. The transmitters are configured to drive the plurality of ADSL lines. Thus, the plurality ADSL lines are driven by the plurality of analog DMT signals.

6498521, Dec 24, 2002

Nov 29, 2001

09/998671

Ara Bicakci - San Jose CA
Sang-Soo Lee - Cupertino CA
Cormac S. Conroy - Sunnyvale CA

LSI Logic Corporation - Milpitas CA

H03B 100

327110, 327309

A dynamic supply control circuit is provided for a line driver. The line driver has an amplification factor G, receives an input signal voltage, and drives a transmission line having a load R via a transformer having a turns ratio of 1:n. The circuit includes an input node for receiving an input signal voltage, a supply node for supplying a driving voltage to the line driver, a lift diode coupled between a fixed supply voltage and the supply node, a lift capacitor coupled between the supply node and an output node, and a lift amplifier having the amplification factor G coupled between the input node and the output node. The lift amplifier drives the lift capacitor when the input signal voltage is greater than an input threshold voltage, the input threshold voltage having a value greater than a common mode voltage of the input signal voltage.

6724219, Apr 20, 2004

Jun 15, 2001

09/882499

Ara Bicakci - San Jose CA
Cormac S. Conroy - Sunnyvale CA
Sang-Soo Lee - Cupertino CA

LSI Logic Corporation - Milpitas CA

H04B 303

326 30, 375257, 375258, 333117, 333120

A line driver for coupling a data transceiver to a transmission line having a load impedance via a transformer with a turns ratio of 1:n includes an input port for receiving an input signal voltage from the data transceiver, an output port for supplying an output signal voltage to the transformer, and an amplifier circuit for amplifying the input signal voltage. The amplifier circuit includes a first output stage, a second output stage coupled to the output port, an output resistor coupled to the first output stage, a feedback path from the first output stage to an input of the amplifier circuit, and a line matching network coupled between the first output stage and the second output stage, for compensating variations in the load impedance, so that a synthesized output impedance of the line driver substantially matches an actual load impedance Z of the transmission line.

6806779, Oct 19, 2004

Dec 20, 2002

10/325478

Beomsup Kim - Cupertino CA
Cormac S. Conroy - Sunnyvale CA

Berkana Wireless, Inc. - Campbell CA

H03L 700

331 16, 331117 FE, 331177 R

A system and method are disclosed for generating a synthesized signal. A frequency synthesizer is used. The frequency synthesizer includes an input interface configured to receive an input signal having a reference frequency; a phase locked loop (PLL) coupled to the input interface, having a fractional N configuration and comprises a voltage controlled oscillator; wherein the voltage controlled oscillator is configured to generate the synthesized signal; and the voltage controlled oscillator includes an on-chip inductor.

6836193, Dec 28, 2004

Dec 20, 2002

10/325504

Beomsup Kim - Cupertino CA
Cormac S. Conroy - Sunnyvale CA

Berkana Wireless, Inc. - Campbell CA

H03B 508

331179, 331 16, 331 36 C, 331177 V

A system and method are disclosed for generating a variable frequency output. A voltage controlled oscillator (VCO) is used. The VCO comprises a plurality of aggregate capacitor circuits, wherein each of the aggregate capacitor circuits has a collective capacitance, at least two of the collective capacitances have different values, and each of the aggregate capacitor circuits includes one or more individual capacitors wherein each of the individual capacitors are substantially the same size. The VCO further comprises a plurality of switches configured to select one or more aggregate capacitor circuits from among the plurality of aggregate capacitor circuits to form a discretely variable capacitor network having a discretely variable capacitance, wherein the discretely variable capacitor network is configured to cause an oscillator to generate a variable frequency as a result of the discretely variable capacitance.

6870928, Mar 22, 2005

May 25, 2001

09/866525

Cormac S. Conroy - Sunnyvale CA, US
Samuel W. Sheng - San Jose CA, US
Ara Bicakci - San Jose CA, US
John DeCelles - Campbell CA, US
Sang-Soo Lee - Cupertino CA, US

LSI Logic Corporation - Milpitas CA

H04M001/00

37939901, 379391, 379392, 379402

A line interface couples signals between a data transceiver and a transmission line having a load impedance Z. The line interface includes a transformer, a driver circuit for supplying a transmit signal from the data transceiver to the transformer, and a receiver circuit for receiving a receive signal from the transformer. The transformer includes a first port coupled to the transmission line, a second port coupled to the driver circuit, a third port coupled to the receiver circuit, a first winding part having a turns ratio of 1: n, where n>1, for coupling the transmit signal from the second port to the first port, and a second winding part having a turns ratio of 1: m, where m

6970515, Nov 29, 2005

Jun 8, 2001

09/878142

Ara Bicakci - San Jose CA, US
Cormac S. Conroy - Sunnyvale CA, US

LSI Logic Corporation - Milpitas CA

H04B003/00

375257, 375219, 375220, 375258, 370321, 370470

A line driver couples a data transceiver to a transmission line having a load impedance Z via a transformer with a turns ratio of 1:n, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range different from the first frequency range. The line driver includes an input port for receiving an input signal voltage, an output port for supplying an output signal voltage to the transformer, and a differential amplifier having a low pass filter for amplifying the input signal voltage and outputting an amplified signal voltage. The line driver further includes termination resistors having a resistance R, where and a positive feedback path for coupling the output signal voltage from the output port to an appropriate node of the differential amplifier so that a synthesized output impedance substantially matches the load impedance Z over the second frequency range.

6976051, Dec 13, 2005

Nov 14, 2001

10/003724

Ozan E. Erdogan - Campbell CA, US
Cormac Conroy - Sunnyvale CA, US

Berkana Wireless Inc. - Campbell CA

G06G007/02

708819

A complex filter includes an I channel having a first I channel output and a second I channel output and a Q channel having a first Q channel output and a second Q channel output. The second I channel output is input to the Q channel through a first passive network and wherein the second Q channel output is input to the I channel through a second passive network.