Igor A Tarnikov

20070025004, Feb 1, 2007

Oct 11, 2005

11/249042

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

G11B 27/36

360031000

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.

20140047198, Feb 13, 2014

Aug 7, 2012

13/568605

Anatoli B. Stein - Atherton CA, US
Igor Tarnikov - Palo Alto CA, US
Valeriy Serebryanski - Sunnyvale CA, US

Guzik Technical Enterprises - Mountain View CA

G06F 12/00
H03M 13/00

711154, 711E12001

A data acquisition device incorporates a front end analog-to-digital converter (ADC), which is responsive to an applied analog input signal, sample that signal and provide digital data representative of the sampled signal. The digital data is applied to a data channel connected to a data acquisition memory, which stores data values representative of the sampled analog input signal. The digital data from the ADC is also applied to a real time a trigger channel connected to a composite function trigger equalizer and filter, a trigger processor and to a trigger memory. The trigger channel operates in real time to identify trigger events and store real-time trigger event occurrence signals in the trigger memory. A controller reads out the stored data values from the data acquisition memory by way of a data equalizer, in synchronism with corresponding real-time trigger event occurrence signals from the trigger memory.

20160241253, Aug 18, 2016

Jan 11, 2016

14/992364

- Mountain View CA, US
Anatoli B. Stein - Atherton CA, US
Lauri Viitas - Palo Alto CA, US
Igor Tarnikov - Palo Alto CA, US

H03M 1/12
G01S 7/35

A two-stage digital down-conversion device for optimal detection of varying RF pulses incorporates a front end analog to digital converter (ADC), which samples an input RF signal and performs a first stage digital down conversion in wide bandwidth by means of two digital local oscillator multipliers, low pass filters and decimators. A stream of first stage quadrature I and Q samples is analyzed by a first stage I/Q processor. The I/Q processor generates an RF pulse trigger based on a first-stage envelope signal, center frequency and frequency span data which are used for a second stage narrow band digital down-conversion. The second stage digital down-conversion is based on mixing the first stage I and Q data samples with a second stage local oscillator, further low pass filtering and decimation using a second bandwidth. A stream of second stage I/Q quadrature samples has an optimal signal to noise ratio and allows accurate estimation of RF pulse parameters (magnitude, phase and frequency) by means of a second I/Q signal processor and/or by storing second I/Q data for subsequent processing and analysis.

20160231357, Aug 11, 2016

Jan 11, 2016

14/992373

- Mountain View CA, US
Anatoli B. Stein - Atherton CA, US
Lauri Viitas - Palo Alto CA, US
Igor Tarnikov - Palo Alto CA, US

G01R 13/02

Digital signal acquisition system is triggered when an input waveform matches a known reference waveform. This is achieved by calculating a stream of error metric values defined as a sum of absolute values of differences between incoming and reference samples. An error metric is calculated using only byte operations, which is advantageous for hardware implementation. A waveform trigger is determined by a sample index corresponding to a minimum value of the error metric and corresponds to a best match between input and reference waveforms. A waveform trigger is used for synchronous averaging and estimating time domain noise voltage. A reference waveform updates in poor SNR conditions to provide robust estimates of time domain noise by reducing reference waveform jitter.

20150349983, Dec 3, 2015

May 29, 2015

14/725535

- Mountain View CA, US
Anatoli B. Stein - Atherton CA, US
Semen P. Volfbeyn - Palo Alto CA, US
Igor Tarnikov - Palo Alto CA, US

GUZIK TECHNICAL ENTERPRISES - Mountain View CA

H04L 25/03
H04L 25/06

An acquisition device includes an analog to digital converter (ADC) composed of multiple interleaved ADCs (sub-ADCs), which receives an analog signal which is converted to digital form. The digitized signal is processed seriatim by a pre-(or trigger-) equalizer, an acquisition memory and a post-(or memory) equalizer. In a calibration mode, frequency responses of the respective sub-ADCs are determined and trigger coefficients are determined for application to the trigger equalizer to effect a preliminary equalization of the digitized signal sufficient to permit operation of the trigger processor in an acquisition mode. Memory coefficients are determined based on residual frequency responses of the sub-ADCs, for application to the memory equalizer. A trigger processor is responsive to the trigger equalizer to select a subset of samples of the digitized signal for loading to the acquisition memory. The trigger equalizer and a memory equalizer are configured for consecutive operation so that, in an acquisition mode, the memory equalizer receives as its input, a digitized signal from the ADC that has been pre-processed in the trigger equalizer, and the memory equalizer corrects only the residue of misalignments and frequency distortions that remain after the trigger equalizer operation.