Ankush Goel

US Patent:

8258877, Sep 4, 2012

Filed:

Mar 18, 2010

Appl. No.:

12/727194

Inventors:

Ankush Goel - Los Angeles CA, US
Alireza Imani - Irvine CA, US
Hossein Hashemi - Los Angeles CA, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

H03L 7/00
H03B 28/00
H03C 3/02

US Classification:

331 1R, 331 74, 331175, 332144, 327154

Abstract:

Systems, methods, and apparatus are described that provide for low phase-noise, spectrally-pure, and low-jitter signals from electrical oscillators. An aspect of the present disclosure includes utilization of an open-loop feed-forward phase-noise cancellation scheme to cancel phase noise, or jitter, of an electrical oscillator. Phase noise can be measured and then subtracted, with the phase noise measurement and subtraction being performed at a speed faster than phase noise variations of the oscillator. Another aspect of the present disclosure includes use of a feedback scheme for phase noise reduction. A feedback scheme can be used alone or in conjunction with a feed-forward scheme. Related phase-noise cancellation and/or reduction methods are described. Notch filter and RF amplifier circuits are also described.

US Patent:

20110063038, Mar 17, 2011

Filed:

Feb 9, 2010

Appl. No.:

12/702798

Inventors:

Herschel A. Ainspan - Yorktown Heights NY, US
John F. Bulzacchelli - Yorktown Heights NY, US
Daniel J. Friedman - Yorktown Heights NY, US
Ankush Goel - Los Angeles CA, US
Alexander V. Rylyakov - Yorktown Heights NY, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H03L 9/00
H03B 5/08

US Classification:

331 47, 331167

Abstract:

A design for an oscillator, and a PLL incorporating such an oscillator, which takes up little physical area but maintains a large tuning range and low phase noise. Two LC-tanks are nested and switched. Through tuning the inactive tank, the range of the active tank may be increased and finer tuning becomes possible.

US Patent:

20120112842, May 10, 2012

Filed:

Jan 16, 2012

Appl. No.:

13/350981

Inventors:

HERSCHEL A. AINSPAN - YORKTOWN HEIGHTS NY, US
JOHN F. BULZACCHELLI - YORKTOWN HEIGHTS NY, US
DANIEL J. FRIEDMAN - YORKTOWN HEIGHTS NY, US
ANKUSH GOEL - LOS ANGELES CA, US
ALEXANDER V. RYLYAKOV - YORKTOWN HEIGHTS NY, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - ARMONK NY

International Classification:

H03L 7/00

US Classification:

331 16

Abstract:

A design for an oscillator, and a PLL incorporating such an oscillator, which takes up little physical area but maintains a large tuning range and low phase noise. Two LC-tanks are nested and switched. Through tuning the inactive tank, the range of the active tank may be increased and finer tuning becomes possible.

US Patent:

20120299651, Nov 29, 2012

Filed:

Aug 2, 2012

Appl. No.:

13/565642

Inventors:

Ankush Goel - Los Angeles CA, US
Alireza Imani - Irvine CA, US
Hossein Hashemi - Los Angeles CA, US

Assignee:

UNIVERSITY OF SOUTHERN CALIFORNIA - Los Angeles CA

International Classification:

H03F 1/00

US Classification:

330185

Abstract:

Systems, methods, and apparatus are described that provide for low phase-noise, spectrally-pure, and low-jitter signals from electrical oscillators. An aspect of the present disclosure includes utilization of an open-loop feed-forward phase-noise cancellation scheme to cancel phase noise, or jitter, of an electrical oscillator. Phase noise can be measured and then subtracted, with the phase noise measurement and subtraction being performed at a speed faster than phase noise variations of the oscillator. Another aspect of the present disclosure includes use of a feedback scheme for phase noise reduction. A feedback scheme can be used alone or in conjunction with a feed-forward scheme. Related phase-noise cancellation and/or reduction methods are described. Notch filter and RF amplifier circuits are also described.

US Patent:

20150236390, Aug 20, 2015

Filed:

Feb 19, 2015

Appl. No.:

14/626572

Inventors:

Behnam Analui - Irvine CA, US
Ankush Goel - West Hollywood CA, US
Hossein Hashemi - Pacific Palisades CA, US

Assignee:

UNIVERSITY OF SOUTHERN CALIFORNIA - Los Angeles CA

International Classification:

H01P 1/20
H04B 1/04
H04B 1/12
H03H 9/25

Abstract:

A cancellation-based filter may have at least one frequency pass band and at least one frequency stop band. The cancellation-based filter may include a first group of one or more band pass filters, each having at least one acoustic resonator, the first group providing at least one frequency pass band for the cancellation-based filter; at least one hybrid coupler; and a second group of one or more band pass filters, each having at least one acoustic resonator, the second group coupled to at least one of the at least one hybrid couplers, wherein the at least one hybrid coupler and the second group of one or more band pass filters interact to provide at least one frequency stop band for the cancellation-based filter.

US Patent:

20150236395, Aug 20, 2015

Filed:

Feb 13, 2015

Appl. No.:

14/622627

Inventors:

Behnam Analui - Irvine CA, US
Ankush Goel - West Hollywood CA, US
Hossein Hashemi - Pacific Palisades CA, US

Assignee:

UNIVERSITY OF SOUTHERN CALIFORNIA - Los Angeles CA

International Classification:

H01P 5/22
H03H 7/01

Abstract:

A two-port tunable or reconfigurable network having a filter transfer function may include: a network input port; a network output port; a hybrid coupler having a hybrid input port, a hybrid isolated port, a hybrid through port, and a hybrid coupled port; a first internal two-port network connected between the network input port and the hybrid input port; a second internal two-port network connected between the network output port and the hybrid isolated port; and a third internal two-port network connected between the hybrid through port and the hybrid coupled port. At least one of the first internal two-port network, the second internal two-port network, the third internal two-port network, and the hybrid coupler may be tunable or reconfigurable in response to an electrical signal or a user-operated control in a way that tunes or reconfigures the filter transfer function of the two-port tunable or reconfigurable network.A two-port tunable or reconfigurable network having a filter transfer function may include: a network input port; a network output port; a hybrid coupler having a hybrid input port, a hybrid isolated port, a hybrid through port, and a hybrid coupled port; a first load; a second load; a first internal two-port network connected between the between the first load and the hybrid through port; and a second internal two-port network connected between the between the second load and the hybrid coupled port. At least one of the first internal two-port network, the second internal two-port network, the hybrid coupler, the first load, and the second load may be tunable or reconfigurable in response to an electrical signal or a user-operated control in a way that tunes or reconfigures the filter transfer function of the two-port tunable or reconfigurable network.

US Patent:

20150236842, Aug 20, 2015

Filed:

Feb 17, 2015

Appl. No.:

14/624289

Inventors:

Ankush Goel - West Hollywood CA, US
Behnam Analui - Irvine CA, US
Hossein Hashemi - Pacific Palisades CA, US

Assignee:

UNIVERSITY OF SOUTHERN CALIFORNIA - Los Angeles CA

International Classification:

H04L 5/14
H04B 1/525

Abstract:

A multi-port hybrid-based cancellation network may include a first and second hybrid coupler, and a first and second two-port network. The second hybrid coupler may be distinct from the first hybrid coupler. The first two-port network may include a first filter connected between the first and the second hybrid couplers. The second two-port network may include a second filter that is distinct from but essentially the same as the first filter connected between the first and the second hybrid couplers. Other circuitry components may be connected to one of the ports of multi-port hybrid-based cancellation network. These other circuitry components may have a configuration that increases or maximizes signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.

US Patent:

20150163044, Jun 11, 2015

Filed:

Dec 10, 2014

Appl. No.:

14/565752

Inventors:

Behnam Analui - Irvine CA, US
Ankush Goel - West Hollywood CA, US
Hossein Hashemi - Pacific Palisades CA, US

Assignee:

UNIVERSITY OF SOUTHERN CALIFORNIA - Los Angeles CA

International Classification:

H04L 5/14
H04J 1/02

Abstract:

Multi-port hybrid-based cancellation networks may be used to enable simultaneous transmit and receive in one or more co-existent communication systems. A multi-port hybrid-based cancellation network may include a first and second quadrature hybrid, a first and second two-port network, and other circuitry components. The second quadrature hybrid may be distinct from the first quadrature hybrid. The first two-port network may include a first filter or a first amplifier connected between the first and the second quadrature hybrids. The second two-port network may include a second filter or a second amplifier that is distinct from but essentially the same as the first filter or the first amplifier connected between the first and the second quadrature hybrids. The other circuitry components may be connected between or connected to a connection between one of the quadrature hybrids and one of the two-port networks. These other circuitry components may have a configuration that minimizes signal return loss at least one of the ports of the multi-port hybrid-based cancellation network. They may in addition or instead have a configuration that maximizes signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.