David W Story

US Patent:

20190229700, Jul 25, 2019

Filed:

Apr 2, 2019

Appl. No.:

16/372505

Inventors:

- Woburn MA, US
David Scott Whitefield - Andover MA, US
David Ryan Story - Ladera Ranch CA, US

International Classification:

H03H 7/40
H01P 5/18
H03H 7/01

Abstract:

Electromagnetic coupler systems including built-in frequency detection, and modules and devices including such. One example of an electromagnetic coupler system includes an electromagnetic coupler having an input port, an output port, a coupled port, and an isolation port, the electromagnetic coupler including a main line extending between the input port and the output port, and a coupled line extending between the coupled port and the isolation port, the electromagnetic coupler being configured to produce a coupled signal at the coupled port responsive to receiving an input signal at the input port. An adjustable termination impedance is connected to the isolation port. A frequency detector is connected to the adjustable termination impedance and to the coupled port, and configured to detect a frequency of the coupled signal and provide an impedance control signal to tune the adjustable termination impedance based on the frequency of the coupled signal.

US Patent:

20190207586, Jul 4, 2019

Filed:

Mar 6, 2019

Appl. No.:

16/294846

Inventors:

- Woburn MA, US
David Scott WHITEFIELD - Andover MA, US
David Ryan STORY - Ladera Ranch CA, US

International Classification:

H03H 11/04
H04B 1/48
H03K 17/687
H04B 1/44

Abstract:

Radio-frequency core circuitry includes a first switch arm associated with a first signal band and coupled to a common node, a second switch arm associated with a second signal band and coupled to the common node, a first shunt arm connected to a first shunt node in the first switch arm, and a first transmission line disposed in the first switch arm between the common node and the shunt node and having a length configured present an open circuit at a fundamental frequency associated with the second signal band and to present a short circuit at a harmonic of the fundamental frequency associated with the second signal band.

US Patent:

20180331713, Nov 15, 2018

Filed:

May 6, 2018

Appl. No.:

15/972164

Inventors:

- Woburn MA, US
Nuttapong SRIRATTANA - Billerica MA, US
David Ryan STORY - Ladera Ranch CA, US

International Classification:

H04B 1/44
H01L 27/12
H03K 17/693
H01L 25/18

Abstract:

Radio-frequency switch having intermediate shunt. In some embodiments, a switch assembly can include a first stack and a second stack arranged in series between a first node and a second node, and defining an intermediate node between the first stack and the second stack. Each of the first stack and the second stack can include a respective number of transistors arranged in series. The switch assembly can further include a switchable shunt path having a first end coupled to the intermediate node such that the switchable shunt path is capable of connecting the intermediate node to a second end such as a ground. In some embodiments, the first and second stacks can be configured to be the same or be different.

US Patent:

20170324392, Nov 9, 2017

Filed:

May 5, 2017

Appl. No.:

15/587508

Inventors:

- Woburn MA, US
David Scott Whitefield - Andover MA, US
David Ryan Story - Ladera Ranch CA, US

International Classification:

H03H 7/40
H03H 7/01
H01P 5/18

Abstract:

Electromagnetic coupler systems including built-in frequency detection, and modules and devices including such. One example of an electromagnetic coupler system include an electromagnetic coupler having an input port, an output port, a coupled port, and an isolation port, the electromagnetic coupler including a main line extending between the input port and the output port, and a coupled line extending between the coupled port and the isolation port, the electromagnetic coupler being configured to produce a coupled signal at the coupled port responsive to receiving an input signal at the input port. An adjustable termination impedance is connected to the isolation port. A frequency detector is connected to the adjustable termination impedance and to the coupled port, and configured to detect a frequency of the coupled signal and provide an impedance control signal to tune the adjustable termination impedance based on the frequency of the coupled signal.

US Patent:

20170141759, May 18, 2017

Filed:

Nov 10, 2016

Appl. No.:

15/348635

Inventors:

- Woburn MA, US
David Scott WHITEFIELD - Andover MA, US
David Ryan STORY - Ladera Ranch CA, US

International Classification:

H03H 11/04
H04B 1/44
H03K 17/687

Abstract:

A radio-frequency module includes a switching device having first and second switch arms and a common pole node connected to both the first and second switch arms, a first shunt arm connected to the first switch arm, and a first transmission line disposed in the first switch arm between the common pole node and the first shunt arm, the first transmission line being configured to present a substantially open circuit looking into the first switch arm from the common pole node at a fundamental frequency of a signal transmitting on the second switch arm when the first switch arm is in an OFF-state and the first shunt arm is in an ON-state

US Patent:

20170085245, Mar 23, 2017

Filed:

Dec 2, 2016

Appl. No.:

15/367287

Inventors:

- Woburn MA, US
David Scott Whitefield - Andover MA, US
David Ryan Story - Ladera Ranch CA, US

International Classification:

H03H 7/46
H03H 7/20
H01P 1/18
H01P 5/18
H04B 1/04
H04B 1/40

Abstract:

Provided herein are apparatus and methods for reconfigurable directional couplers in an RF transceiver. Reconfigurable directional couplers can be reconfigured and designed to provide high directivity using configurable capacitors to effect a mutual coupling and using lumped components or delay lines to effect a phase shift. Depending on the embodiment, the reconfigurable directional coupler can include capacitors, inductors, and switching components. The coupler can be designed for multi-band operation with an adjustable coupling factor conducive to semiconductor process integration. The coupler can have variable phase shifters to achieve a desired level of directivity in the coupler.

US Patent:

20170077967, Mar 16, 2017

Filed:

Sep 9, 2016

Appl. No.:

15/260544

Inventors:

- Woburn MA, US
David Scott Whitefield - Andover MA, US
David Ryan Story - Ladera Ranch CA, US

International Classification:

H04B 1/04
H04B 1/00
H04B 1/40

Abstract:

Multi-output electromagnetic couplers configured to detect multiple frequencies simultaneously, and devices and systems including same. In one example a multi-output electromagnetic coupler includes a main coupler transmission line extending between and electrically connecting an input port and an output port, a first coupled line section configured to couple electromagnetic power in a first frequency band from the main coupler transmission line to provide a first coupled output signal at a first coupled port, and a second coupled line section configured to couple electromagnetic power in a second frequency band from the main coupler transmission line to provide a second coupled output signal at a second coupled port simultaneously with the first coupled output signal being provided at the first coupled port.

US Patent:

20160344430, Nov 24, 2016

Filed:

Aug 4, 2016

Appl. No.:

15/228260

Inventors:

- Woburn MA, US
David Scott Whitefield - Andover MA, US
David Ryan Story - Ladera Ranch CA, US

International Classification:

H04B 1/04
H01P 1/18
H03H 7/00
H01P 5/18

Abstract:

Provided herein are apparatus and methods for reconfigurable directional couplers in an RF transceiver. Reconfigurable directional couplers can be reconfigured and designed to provide high directivity using configurable capacitors to effect a mutual coupling and using lumped components or delay lines to effect a phase shift. Depending on the embodiment, the reconfigurable directional coupler can include capacitors, inductors, and switching components. The coupler can be designed for multi-band operation with an adjustable coupling factor conducive to semiconductor process integration. The coupler can have variable phase shifters to achieve a desired level of directivity in the coupler.