Ayal Shoval

US Patent:

6546063, Apr 8, 2003

Filed:

Feb 10, 1998

Appl. No.:

09/021329

Inventors:

Kathleen Otis Lee - Sudbury MA
Robert Henry Leonowich - Muhlenberg Township PA
Ayal Shoval - Whitehall PA

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H04L 2508

US Classification:

375346, 375232, 375319, 375 34 J

Abstract:

A data receiver equalization technique utilizes a receiver clock that has a frequency different that the incoming data frequency (i. e. , an âasynchronous clockâ) to asynchronously sample the incoming data waveform. The resulting information about the data, typically including the rise and/or fall times, overshoot and/or undershoot, and amplitude, may be used to equalize a data channel. Other adjustments to the receiver, including the gain level and DC offset compensation, may also be made using the resulting information. An illustrative embodiment using clocked comparators, continuous-time comparators, and a statistical analysis circuit is shown.

US Patent:

6687286, Feb 3, 2004

Filed:

Dec 17, 1999

Appl. No.:

09/465683

Inventors:

Robert Henry Leonowich - Muhlenberg Township PA
Ayal Shoval - Whitehall PA

Assignee:

Agere Systems, Inc. - Allentown PA

International Classification:

H04L 516

US Classification:

375219, 375361

Abstract:

A single, 10/100 twisted-pair driver for Ethernet and Fast Ethernet applications designed in a 0. 25 m, 3. 3V, digital CMOS process is described. The combined driver sources either 10 Mbaud Manchester data or 125 Mbaud MLT3/NRZI data. In 10 Mbaud mode the driver incorporates programmable features such as an additional common-mode current for various linearity performance as function of power supply dissipation. In 125 Mbaud mode of operation, the driver can be configured for different duty cycle distortion and for various rise and fall-times as a trade-off in EMI performance and remote receiver cable length performance. As well, rise/fall-time asymmetry performance is programmable as a trade-off in supply power dissipation. The driver can be run optimally during a transition and sub-optimally when sending multiple â0â symbols to save power. These power dissipation numbers can be reduced through programmable modes when more relaxed performance targets are acceptable.

US Patent:

6834085, Dec 21, 2004

Filed:

Jan 14, 1998

Appl. No.:

09/006808

Inventors:

Robert Henry Leonowich - Muhlenberg Township, Berks County PA
Ayal Shoval - Whitehall PA
Matthew Tota - Clinton NJ

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H04L 2706

US Classification:

375316, 375377

Abstract:

A multiple data-rate receiver uses a signal rate detection technique that employs comparators to obtain information on the incoming data rate for enabling the appropriate receiver. Once a data rate is determined, only then is the appropriate receiver activated. Hence, power dissipation is kept to a minimum during the autonegotiation phase. This is a significant improvement over existing art which require two (or more) receivers to be active during the autonegotiation phase, consequently demanding high power dissipation. Because the autonegotiation phase can be lengthy, the present technique is preferable in many cases.

US Patent:

61726346, Jan 9, 2001

Filed:

Feb 25, 1998

Appl. No.:

9/030276

Inventors:

Robert H. Leonowich - Muhlenberg Township PA
Omid Shoaei - Allentown PA
Ayal Shoval - Whitehall PA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H03M 180

US Classification:

341153

Abstract:

A line-driver receives as an input a Manchester-encoded digital data signal, which is then converted into an analog signal by a wave-shaping circuit. The wave-shaping circuit comprises a bank of current sources with a combined output, each current source being actuated by a switch controlled by a switching signal. The current sources are each scaled by a coefficient, and are actuated in a selected sequence during each input data pulse, thereby generating as a combined output a staircase pulse signal with n steps for each input data pulse.

US Patent:

60493003, Apr 11, 2000

Filed:

Mar 11, 1998

Appl. No.:

9/038423

Inventors:

Ayal Shoval - Whitehall PA

Assignee:

Lucent Technologies Inc.

International Classification:

H03M 166
H03M 300

US Classification:

341144

Abstract:

A resistor-string DAC employing resistors of different value and a switching circuit for producing a differential analog voltage output which can be shaped with respect to an arbitrary common-mode voltage.

US Patent:

61188158, Sep 12, 2000

Filed:

Dec 19, 1997

Appl. No.:

8/994862

Inventors:

Ryan E. Hirth - Cupertino CA
Ruchi Wadhawan - Sunnyvale CA
Robert H. Leonowich - Temple PA
Ayal Shoval - Whitehall PA
Kathleen O. Lee - Brookline MA

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04L 2701

US Classification:

375232

Abstract:

A method for tuning an adaptive equalizer in order to receive digital signals from a transmission medium both coarse and fine tuning methods to adaptively equalize a signal received from the transmission medium. The coarse tuning method adjusts an equalizer such that the post equalized signal starts to resemble a known data pattern, such as an MLT3 data pattern. The coarse tuning method monitors and corrects for several things: illegal transitions, over equalization, statistical data pattern anomalies and saturation conditions. Fine tuning methods operate concurrently with the coarse tuning methods and function from the point at which the coarse tuning methods stop being efficient. Additionally, the fine tuning methods hold the waveform locked in. In addition to coarse tuning and fine tuning of the equalizer, the present invention also adjusts gain of the overall signal such that the post equalized signal is always a certain amplitude.

US Patent:

6038266, Mar 14, 2000

Filed:

Sep 30, 1998

Appl. No.:

9/164022

Inventors:

Kathleen Otis Lee - Brookline MA
Robert Henry Leonowich - Temple PA
Ayal Shoval - Whitehall PA

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

H04L 2506
H04L 2510

US Classification:

375317

Abstract:

The invention is a receiver front end for a data communications system having adaptive correction for intersymbol interference, DC offset, baseline wander, and flat loss and related method. Each of the compensation circuits is adaptive and is controlled by adaptation logic via a digital feedback loop including a digital integrator for providing perfect or near-perfect integration of the adaptation algorithm feedback error signal. The architecture further utilizes multiple comparators, including continuous-time and clocked comparators, for separately detecting various aspects of the received data signals that are used to determine the signal degradation characteristics needed to generate error signals for the adaptation feedback loops.