Orest Fedan from 52 Prospect St, Boston, MA 02136, age 72, Phone: 617-333-0585

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Location:

Boston, MA

Industry:

Electrical/Electronic Manufacturing

Work:

Lojack Corporation 2001 - 2018
Principal Rf Design Engineer

Education:

Montana State University - Bozeman 1970 - 1974

Skills:

Rf Design
Analog Circuit Design
Pcb Layout Design
Embedded Software
Cpld

Languages:

English
Ukrainian
Spanish

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Location:

Greater Boston Area

Industry:

Automotive

Optical Object Detection Having Circuitry Applying Logarithmic Function To The Average Of Filtered Output
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US Patent:

6362466, Mar 26, 2002
Filed:

Oct 15, 1999
Appl. No.:

09/418712
Inventors:

Orest Fedan - Belmont MA 02478
International Classification:

H01J 4014
US Classification:

250214L, 250221, 340555
Abstract:

An object detector which illuminates an area with a pulsating beam of light and measures light reflected back by an object in the beam. The light source is chopped by three different chopping frequencies. The light detector uses the highest frequency to reject out of band ambient signals and noise, uses the middle frequency for synchronously detecting the reflected signal, and uses the lowest frequency to ratio the output to the noise floor. The light detector uses linear gain prior to filtering out of band ambient signals to avoid intermodulation effects. The light detector uses logarithmic gain after the filtering to avoid overload and transient effects, without requiring an automatic level control circuit.

Dual Table Temperature Compensated Voltage Controlled Crystal Oscillator System And Method
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US Patent:

8130050, Mar 6, 2012
Filed:

Oct 23, 2009
Appl. No.:

12/589430
Inventors:

Orest Fedan - Belmont MA, US
Assignee:

LoJack Operating Company, LP - Westwood MA
International Classification:

H03B 5/32
US Classification:

331158, 331176
Abstract:

Dual table temperature compensation for a voltage controlled crystal oscillator is achieved by sensing the temperature of the voltage controlled crystal oscillator (VCXO), retrieving from a first table the frequency error with variations in the temperature sensed, retrieving from a second table the oscillator control voltage corresponding to the frequency error from the first table and applying the oscillator control voltage to the VCXO.

Notched Saw Image Frequency Rejection Filter System
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US Patent:

8169279, May 1, 2012
Filed:

Oct 23, 2009
Appl. No.:

12/589431
Inventors:

Orest Fedan - Belmont MA, US
Assignee:

Lojack Operating Company, LP - Canton MA
International Classification:

H03H 9/64
H03H 9/52
H04B 1/12
US Classification:

333193, 333194, 455285, 455302
Abstract:

A notched SAW image frequency rejection filter system includes a SAW filter having an input, an output and a ground output and an impedance matching network including a first matching inductance connected to the SAW filter output and a second matching inductance connected to the ground output of the SAW filter; the SAW filter having an inherent internal capacitance that produces a predetermined capacitive leakage current at the image frequency; an inherent internal inductance that produces an inductance leakage current at the image frequency; and a boosted inherent parasitic ground inductance at the ground output of the SAW filter for generating a voltage across the second matching inductance to produce a compensation current which is substantially opposite in phase and substantially matched in magnitude with the capacitive leakage current for reducing the capacitive leakage current and increasing the image frequency rejection.

Fast Settling, Bit Slicing Comparator Circuit
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US Patent:

8242810, Aug 14, 2012
Filed:

Oct 22, 2009
Appl. No.:

12/589367
Inventors:

Orest Fedan - Belmont MA, US
Stephen Bourque - Littleton MA, US
Assignee:

LoJack Operating Company, LP - Canton MA
International Classification:

H03K 5/22
H03K 5/153
US Classification:

327 90, 327 77, 327205
Abstract:

An improved fast settling bit slicing comparator circuit includes a comparator having a non-inverting and inverting input; the non-inverting input receiving an input signal; a filter circuit for receiving the input signal and being connected with the inverting input of the comparator; a positive feedback circuit interconnected between the output of the comparator and the non-inverting input of the comparator for introducing a predetermined hysteresis offset; the filter circuit including a filter resistance and filter capacitance having a reduced time constant sufficient to compensate for at least a portion of the hysteresis offset. Additionally, the positive feedback circuit may be interconnected with the inverting input of the comparator through the filter circuit for gradually reducing the effect of the hysteresis offset by reducing the differential voltage between the inverting and non-inverting inputs.

Surface Acoustic Wave Resonator Filter
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US Patent:

8339220, Dec 25, 2012
Filed:

Sep 16, 2009
Appl. No.:

12/586054
Inventors:

Orest Fedan - Belmont MA, US
Assignee:

LoJack Operating Company, LP - Canton MA
International Classification:

H03H 9/64
H03H 9/52
US Classification:

333195, 333193
Abstract:

A SAW resonator filter including a SAW resonator, and a first inductive reactance in parallel with the SAW resonator for shifting the null points below and above the center frequency for establishing substantially symmetrical attenuation about the center frequency.

Transmission Line Resonator Loop Antenna
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US Patent:

20080036667, Feb 14, 2008
Filed:

Aug 10, 2006
Appl. No.:

11/502191
Inventors:

Orest Fedan - Belmont MA, US
International Classification:

H01Q 11/12
US Classification:

343741, 343713, 343866
Abstract:

A transmission line resonator loop antenna includes a transmission line resonator for receiving an input excitation signal and producing a predetermined resonant output signal which is substantially phase reversed relative to the input excitation signal; and a loop antenna having one end responsive to the phase reversed output signal and the other end responsive to a reference excitation signal for maintaining the predetermined resonance.

Dynamic, Low If, Image Interference Avoidance Receiver
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US Patent:

20080051053, Feb 28, 2008
Filed:

Aug 24, 2006
Appl. No.:

11/509287
Inventors:

Orest Fedan - Belmont MA, US
International Classification:

H04B 1/10
US Classification:

455296
Abstract:

A dynamic low IF image interference avoidance receiver shifts the local oscillator frequency to avoid image interference and shifts the center frequency of the band pass filter to track the frequency shift of the local oscillator or uses two local oscillators, a first to shift frequency and separate the desired frequency and image interference frequency and the second to track the first and maintain the output IF at a fixed frequency

Fast Start, Low Power Oscillator System
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US Patent:

20110095832, Apr 28, 2011
Filed:

Oct 22, 2009
Appl. No.:

12/589366
Inventors:

Orest Fedan - Belmont MA, US
International Classification:

H03B 5/02
US Classification:

331108 R
Abstract:

A fast start, low power oscillator system includes an oscillator circuit including an amplifier and a tank circuit, the amplifier including an operating resistance which sets the amplifier operating current and a speed-up circuit including a switching circuit for temporarily increasing the operating current to an elevated level at start-up and then returning it to the original operating current when the oscillator reaches its operating amplitude.