David Charles Rowe

US Patent:

6421389, Jul 16, 2002

Filed:

Jul 16, 1999

Appl. No.:

09/356384

Inventors:

Preston Jett - Huntsville AL
Lawrence E. Larson - Del Mar CA
Bret A. Pollack - Redondo Beach CA
David A. Rowe - Torrance CA

Assignee:

Time Domain Corporation - Huntsville AL

International Classification:

H04L 2700

US Classification:

375256, 375316, 375340, 375349

Abstract:

A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.

US Patent:

6509801, Jan 21, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/895955

Inventors:

Binneg Y. Lao - Rancho Palos Verdes CA
David A. Rowe - Torrance CA
James R. Pulver - Torrance CA

Assignee:

Sierra Monolithics, Inc. - Redondo Beach CA

International Classification:

H03L 700

US Classification:

331 17, 331 1 A

Abstract:

Methods and apparatus for generating clock signals accurately locked to multi-gigabits-per-second data signals received over fiber optic channels are disclosed. The invention includes a phase detector for comparing a data signal and a clock signal, a one shot unit for detecting a data transition, an XOR, a filter, a main charge pump, a compensating charge pump for producing additive or compensating current, and a VCO for generating the clock signal. The phase detector includes multiple D-flip flops. The one shot unit includes a delay unit and an AND gate. The filter includes a resistor, a capacitor and a negative resistance amplifier. The main charge pump includes differential inputs, double outputs, cross-quading resistors, differential NPN input transistors, and a current source. The compensating charge pump includes differential NPN input transistors and a current source. In operation, when there is a data transition and if the clock signal and data signal are out of phase synchronization, then the compensating charge pump will enhance the operation of the main charge pump, and the VCO will speed up or slow down the clock signal depending on whether the clock signal is advanced or retarded in phase compared to the data signal.

US Patent:

6577691, Jun 10, 2003

Filed:

Jul 20, 2001

Appl. No.:

09/910178

Inventors:

James L. Richards - Fayetteville TN
Preston L. Jett - Huntsville AL
Larry W. Fullerton - Brownsboro AL
Lawrence E. Larson - Del Mar CA
David A. Rowe - Torrance CA

Assignee:

Time Domain Corporation - Huntsville AL

International Classification:

H04L 700

US Classification:

375355, 375373

Abstract:

A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coarse timing signal from a clock signal and a timing command input. The fine timing generator includes a sinusoidal-signal generator that receives the clock signal and generates a sinusoidal signal. The fine timing generator also includes a phase shifter that receives the sinusoidal signal and the timing command input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.

US Patent:

6636573, Oct 21, 2003

Filed:

Sep 18, 2001

Appl. No.:

09/954201

Inventors:

James L Richards - Fayetteville TN
Preston Jett - Huntsville AL
Larry W Fullerton - Brownsboro AL
Lawrence E Larson - Del Mar CA
David A Rowe - Torrance CA

Assignee:

Time Domain Corporation - Huntsville AL

International Classification:

H04L 700

US Classification:

375355, 375371

Abstract:

A frame reference signal is produced as a function of a clock signal. A first timing generator generates a coarse timing signal having a nominal period and a transition occurring at a precise temporal position with respect to the nominal period. The nominal period is a function of the frame reference signal. The temporal position is a function of a first input timing command and the clock signal. A second timing generator generates at least one fine timing transition as a function of a second input timing command and the clock signal. A combiner circuit uses the coarse timing signal to select one of the at least one fine timing transitions to output a precise timing signal, wherein the precise timing signal has a high temporal precision with respect to the frame reference signal.

US Patent:

6744325, Jun 1, 2004

Filed:

Apr 3, 2002

Appl. No.:

10/115400

Inventors:

David A. Rowe - Torrance CA

Assignee:

Sierra Monolithics, Inc. - Redondo Beach CA

International Classification:

H03B 2700

US Classification:

331 57, 331117 R, 331 56, 331 45, 331177 R, 331135, 375376

Abstract:

A quadrature ring oscillator for high clock-rate applications is disclosed. A quadrature LC ring oscillator may use two stages of LC oscillators and variable mixers to provide consistent oscillation even at high clock rates. One stage of the quadrature ring oscillator comprises a first resonating element having an input and an output, and a first variable summer having L and P inputs and an output, with its L input being connected to the output of the first resonating element. The output of the first variable summer is connected to the input of the first resonating element The first variable summer may generate its output at a first phase by combining the L and P inputs. A second stage of the LC ring oscillator comprises a second resonating element, which has an input and an output, with its output being connected to the P input of the first variable summer. An inverter is used to produce an inverted signal of the output of the first resonating element. This stage also comprises a second variable summer having L and P inputs and an output, with its output connected to the input of the second resonating element.

US Patent:

6803252, Oct 12, 2004

Filed:

Nov 21, 2001

Appl. No.:

09/990247

Inventors:

Binneg Y. Lao - Rancho Palos Verdes CA
William W. Chen - Westchester CA
David A. Rowe - Torrance CA
Inho Kim - Palo Alto CA

Assignee:

Sierra Monolithics, Inc. - Redondo Beach CA

International Classification:

H01L 2144

US Classification:

438106, 438122, 438123

Abstract:

Methods and apparatus for providing connection packages for high-speed integrated circuits (âICsâ) in optical, electronic, wired or wireless communications are disclosed. The connection package achieves dimensional transformation of signal routes from high-speed, high-density ICs input/output pads to the external terminals such as coaxial terminals and BGA balls, while maintaining constant characteristic impedance throughout the transmission lines. A package may include a substrate having microstrips for communicating signals between the IC pads and external terminals. A pair of differential microstrips can be positioned closer to each other near the IC pads and create capacitive coupling. Such coupled capacitance allows the width of the microstrips to be reduced. A portion of the coupled microstrips near the IC pads can be widened to increase the capacitance so that the overall transmission path can become an all-pass networkâfrom the IC pads, through the bonding wires, to the microstrips.

US Patent:

6937663, Aug 30, 2005

Filed:

Jan 23, 2002

Appl. No.:

10/055007

Inventors:

Preston Jett - Huntsville AL, US
Lawrence E. Larson - Del Mar CA, US
Bret A. Pollack - Redondo Beach CA, US
David A. Rowe - Torrance CA, US

Assignee:

Alereon, Inc. - Austin TX

International Classification:

H04L027/00

US Classification:

375256, 375316, 375340, 375349

Abstract:

A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.

US Patent:

6950485, Sep 27, 2005

Filed:

Dec 26, 2002

Appl. No.:

10/329739

Inventors:

James L. Richards - Fayetteville TN, US
Preston L. Jett - Huntsville AL, US
Larry W. Fullerton - Brownsboro AL, US
Lawrence E. Larson - Del Mar CA, US
David A. Rowe - Torrance CA, US

Assignee:

Alereon, Inc. - Austin TX

International Classification:

H04L007/00

US Classification:

375355

Abstract:

A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coarse timing signal from a clock signal and a timing command input. The fine timing generator includes a sinusoidal-signal generator that receives the clock signal and generates a sinusoidal signal. The fine timing generator also includes a phase shifter that receives the sinusoidal signal and the timing command input and shifts the phase of the sinusoidal signal based on the timing input to generate the phase shifted sinusoidal signal.