Semen P Volfbeyn

US Patent:

7165211, Jan 16, 2007

Filed:

Sep 20, 2004

Appl. No.:

10/945117

Inventors:

Anatoli B. Stein - Atherton CA, US
Semen P. Volfbeyn - Milpitas CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

H03M 13/03

US Classification:

714795

Abstract:

A decoder for detecting data within an input signal with attenuated low frequency components that comprises a Viterbi decoder, is disclosed. Viterbi decoder internal data is used along with its output bits to reduce delay between the restored direct current (DC) component and the input signal to zero. As a result, increased accuracy of DC restoration and corresponding bit error rate reduction are achieved.

US Patent:

7245449, Jul 17, 2007

Filed:

Oct 11, 2005

Appl. No.:

11/249042

Inventors:

Anatoli Stein - Atherton CA, US
Semen P. Volfbeyn - Milpitas CA, US
Vladislav A. Klimov - San Jose CA, US
Igor Tarnikov - Palo Alto CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

G11B 5/35

US Classification:

360 65, 360 31, 360 51, 360 39

Abstract:

Analysis of a read back signal in a magnetic recording device is disclosed. The read back signal is converted to a digital read back signal, and a low frequency component of the digital read back signal is restored. A sample clock is recovered from the restored digital read back signal, and the restored digital read back signal is averaged using the recovered sample clock. A timing error is calculated based at least in part on the averaged restored digital read back signal.

US Patent:

7408495, Aug 5, 2008

Filed:

Jul 25, 2006

Appl. No.:

11/493353

Inventors:

Anatoli Stein - Atherton CA, US
Semen P. Volfbeyn - Milpitas CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

H03M 1/12

US Classification:

341155, 341120

Abstract:

Time variant interleaving equalization of an interleaved analog to digital converter is disclosed. A high-frequency analog input signal is converted into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters. the plurality of individual digital signals are interleaved into a composite digital signal. The composite digital signal is processed in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients.

US Patent:

7705609, Apr 27, 2010

Filed:

Nov 21, 2007

Appl. No.:

11/944086

Inventors:

Nahum Guzik - Palo Alto CA, US
Vladislav Klimov - San Jose CA, US
Semen Volfbeyn - Milpitas CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

G01R 23/20

US Classification:

324620, 324622

Abstract:

Disclosed is a method of measuring frequency distortions characteristics of a device under test, the device configured convert an input signal in an input frequency range to an output signal in a different output frequency range. The method includes, for each test frequency f, where i=1,. . . , N and N a positive integer, in a selected frequency range, providing a corresponding test signal with multiple frequency components having a measurement component with a frequency f, a first reference component with a frequency fand a second reference component with a frequency f; inputting the test signals into the device under test; measuring output test signals at the output of the device under test corresponding to the input test signals; and determining, for each test frequency f, information representative of frequency distortions based on the corresponding input test signal and the corresponding output test signal.

US Patent:

7791329, Sep 7, 2010

Filed:

Nov 21, 2007

Appl. No.:

11/944076

Inventors:

Anatoli B. Stein - Atherton CA, US
Semen Volfbeyn - Milpitas CA, US
Vladislav Klimov - San Jose CA, US
Sergey Konshin - Mountain View CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

G01R 23/00

US Classification:

324 7619, 324620, 455 6711

Abstract:

Disclosed is a method of equalization of a vector/signal analyzer including: providing a structured test signal within a selected frequency range. The structured test signal includes a plurality of frequency components each having a respective amplitude and phase. The method includes inputting the test signal to the analyzer; the analyzer operating to condition the test signal; determining information representative of frequency distortion of the conditioned test signal introduced by the analyzer; generating a set of equalization coefficients based on the information representative of the frequency distortion, the set of coefficients corresponding to the selected frequency range; and storing the set of equalization coefficients and the correspondence of the set of coefficients to the selected frequency range.

US Patent:

7830217, Nov 9, 2010

Filed:

Nov 24, 2008

Appl. No.:

12/276718

Inventors:

Anatoli Stein - Atherton CA, US
Semen Volfbeyn - Milpitas CA, US
Nahum Guzik - Palo Alto CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

H03C 3/00
H04L 27/20

US Classification:

332103, 332144

Abstract:

A vector signal generator with direct RF signal synthesis is disclosed. The vector signal generator comprises an RF signal synthesizer, a switch, and a memory. The RF signal synthesizer is configured for converting baseband IQ signals into a modulated digital RF signal. The RF signal synthesizer is connected to an I input, a Q input, a clock input, a control input, and an output, where the clock input is a clock input of the vector signal generator, the control input is a control input of the vector signal generator, and the output is an RF signal output of the vector signal generator. The switch is configured for selecting a source of IQ signals and is connected to an external I input, an external Q input, a stored signal I input, a stored signal Q input, the control input, an I output, and a Q output. The external I input and external Q input are external IQ inputs to the vector signal generator and the I output and the Q output are connected to the I input and the Q input of the RF signal synthesizer. The memory is configured for storing IQ signals samples, said memory being connected to the control input and having a stored I output, connected to the stored signal I input, and a stored Q output connected to the stored signal Q input.

US Patent:

8477445, Jul 2, 2013

Filed:

Dec 5, 2012

Appl. No.:

13/706311

Inventors:

Semen P. Volfbeyn - Milpitas CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

G11B 5/09

US Classification:

360 51

Abstract:

A write clock generator for use in writing data to a rotating patterned magnetic media disk is disclosed. The generator includes a magnetic read head for generating a succession of servo signals representative of succession of servo magnetization patterns detected from a corresponding succession of arcuate sectors along a circular data track on the disk. A preamble processor generates a corresponding succession of sector pair signals representative of the lengths of adjacent sectors along the data track on a rolling pair-wise basis. A next sector length predictor processor determines for a succession of pairs of sectors, a length ratio of the lengths of the sectors in the respective pairs of sectors. A clock generator generates a periodic clock for each sector of the succession of sectors, wherein the clock rate associated with a current sector has an associated phase deviation relative to a clock rate associated with a previous sector, which is proportional to the length ratio for the current sector and the previous sector.

US Patent:

8537044, Sep 17, 2013

Filed:

Dec 28, 2012

Appl. No.:

13/730071

Inventors:

Semen P. Volfbeyn - Palo Alto CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

H03M 1/12

US Classification:

341155, 341120

Abstract:

An interleaved analog to digital converter with digital equalization includes a conversion-measurement-equalization unit and residual distortions reduction unit, and is operative in a calibration mode and converter mode. The conversion-measurement-equalization unit includes a composite ADC containing N sub-ADCs, equalizer, responses measurement unit and a coefficients calculator. The residual distortions reduction unit uses received measured frequency responses and equalizer coefficients, both from the conversion-measurement-equalization unit, as a base to calculate corrected frequency responses that are applied to the coefficients calculator for generation of equalizer coefficients for application to the equalizer. A residual distortions calculator of the residual distortions reduction unit, is responsive to measured frequency responses from the composite ADC and a current set of equalizer coefficients applied to the equalizer, to calculate residual frequency distortions that should have been expected to appear in the output signal of the ADC system if the current equalizer coefficients remain applied to the equalizer.