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Christopher D Grondahl

from Gilbert, AZ
Age ~64
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Also known as:
Christopher David Grondahl, Chris D Grondahl, Chris J Grondahl, Christoph D Grondahl, Janeen Grondahl, Chris D Grandahl, Chris Groudahl
Phone and address:
431 E Hopkins Rd, Gilbert, AZ 85295
Related to:
Jared Grondahl, 38Jenica Grondahl, 37Stanworth GrondahlJaneen Grondahl, 62
Connected to:
Lynda J Grondahl, 71Shari K Grondahl, 60Cathy C Grondek, 73Holly Grondel, 33Catherine F Grondin, 77Cindy I Grondin, 67Francis S Grondin, 58Frank J Grondin, 49James J Grondin, 66Jenny A Grondin, 45

Christopher Grondahl Phones & Addresses

  • 431 E Hopkins Rd, Gilbert, AZ 85295
  • Tooele, UT
  • Chandler, AZ
  • Salt Lake City, UT
  • Bristol, TN
  • Liverpool, NY
  • Maricopa, AZ

Resumes

Resumes

Christopher Grondahl Photo 1

Electrical Engineer At Viasat

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Location:
United States
Industry:
Defense & Space
Christopher Grondahl Photo 2

Christopher Grondahl

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Location:
United States

Publications

Us Patents

Mmic Folded Power Amplifier

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US Patent:
6388528, May 14, 2002
Filed:
Sep 24, 2001
Appl. No.:
09/961599
Inventors:
Kenneth V. Buer - Gilbert AZ
Christopher D. Grondahl - Chandler AZ
Michael R. Lyons - Gilbert AZ
Assignee:
U.S. Monolithics, L.L.C. - Chandler AZ
International Classification:
H03F 368
US Classification:
330295, 330307
Abstract:
A MMIC power amplifier having a smaller die size and higher power output are realized with the improved amplifier and transistor geometry herein provided. In particular, transistors, such as FETs (field effect transistors) are displaced from a conventional FET geometry with alternating FETs being rotated in opposite directions. The inputs (gate pads) and outputs (drain pads) of two adjacent FETs may be âshared. â In a shared input configuration, a compensation network may be coupled to the input. The improved FET configuration reduces the number of splitting and combining networks by up to 50% over the prior art and the die area for a typical 4 watt power amplifier is reduced by 48-72% over the prior art. The improved amplifier configuration provides a multi-sectional configuration wherein one section may be the mirrored image of another. In a two section amplifier, the amplifier appears to be âfolded. â.

Distributed Doherty Amplifiers

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US Patent:
8013680, Sep 6, 2011
Filed:
Nov 5, 2008
Appl. No.:
12/265532
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Dean Lawrence Cook - Mesa AZ, US
Assignee:
ViaSat, Inc. - Carlsbad CA
International Classification:
H03F 3/68
US Classification:
330295, 330286
Abstract:
Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.

Distributed Doherty Amplifiers

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US Patent:
8169264, May 1, 2012
Filed:
Aug 2, 2011
Appl. No.:
13/196255
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Dean Lawrence Cook - Mesa AZ, US
Assignee:
ViaSat, Inc. - Carlsbad CA
International Classification:
H03F 3/68
US Classification:
330295, 330286
Abstract:
Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.

Multi-Chip Doherty Amplifier With Integrated Power Detection

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US Patent:
8183929, May 22, 2012
Filed:
Apr 9, 2010
Appl. No.:
12/757803
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Assignee:
ViaSat, Inc. - Carlsbad CA
International Classification:
H03F 3/68
US Classification:
330295, 330124 R
Abstract:
In accordance with an exemplary embodiment of the present invention, a Doherty amplifier is provided for applications in radio frequency, microwave, and other electronic systems. An exemplary Doherty amplifier comprises a first MMIC having a first power detector, and a second MMIC having a second power detector. The first MMIC and the second MMIC are structurally identical. Furthermore, the first MMIC is configured as a carrier amplifier and the second MMIC is configured as a peaking amplifier. In the exemplary embodiment, an amplifier control bias of the carrier amplifier is a function of the power detected by the first power detector and an amplifier control bias of the peaking amplifier is a function of the power detected by the second power detector. The ability to assemble a Doherty amplifier using a single MMIC product results in a simple and less expensive manufacturing process.

Distributed Doherty Amplifiers

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US Patent:
8279009, Oct 2, 2012
Filed:
Apr 13, 2012
Appl. No.:
13/446203
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Dean Lawrence Cook - Mesa AZ, US
Assignee:
ViaSat, Inc. - Carlsbad CA
International Classification:
H03F 3/60
US Classification:
330286, 330295
Abstract:
Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module.

Capacitively Loaded Spurline Filter

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US Patent:
8384498, Feb 26, 2013
Filed:
Nov 6, 2009
Appl. No.:
12/613724
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Michael R. Lyons - Gilbert AZ, US
Dean Lawrence Cook - Mesa AZ, US
Assignee:
ViaSat, Inc. - Carlsbad CA
International Classification:
H01P 1/203
H01P 7/08
US Classification:
333204, 333219
Abstract:
In an exemplary embodiment, a spurline filter comprises a capacitive element connected to a spur and either a through-line of the spurline filter or ground. In another embodiment, multiple capacitive elements are connected to the spur. In an exemplary embodiment, the capacitively loaded spurline filter provides a band rejection frequency response similar to the band rejection frequency response of a similar spurline filter that does not comprise at least one capacitive element but the capacitively loaded spurline filter has half the layout area or less. In an exemplary embodiment, the spurline filter comprises capacitive elements, where the capacitive elements are configured to reduce the resonant frequency of the filter.

Highly Integrated, High Frequency, High Power Operation Mmic

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US Patent:
20110250861, Oct 13, 2011
Filed:
Apr 8, 2010
Appl. No.:
12/756964
Inventors:
Michael R. Lyons - Gilbert AZ, US
Kenneth V. Buer - Gilbert AZ, US
Dean Lawrence Cook - Mesa AZ, US
Christopher D. Grondahl - Gilbert AZ, US
Assignee:
VIASAT, INC. - Carlsbad CA
International Classification:
H04B 1/26
US Classification:
455326
Abstract:
A system and method for high frequency, high power operation communication systems is provided. More particularly, a system and method for a single system-on-chip system monolithic microwave integrated circuit that provides both high-frequency performance at a low cost is provided.

Transistor Switches With Single-Polarity Control Voltage

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US Patent:
20130021111, Jan 24, 2013
Filed:
Jul 20, 2011
Appl. No.:
13/187195
Inventors:
Christopher D. Grondahl - Gilbert AZ, US
Assignee:
VIASAT, INC. - Carlsbad CA
International Classification:
H01P 1/18
US Classification:
333164, 333139
Abstract:
Contrary to phase shifters which require complimentary polarity control voltages, a phase shifter may be driven with a single polarity control voltage. The phase shifter comprises an input node in communication with both a high pass network and a low pass network which are both in communication with an output node, where the phase shifter further comprises a first single pole double throw switch and a second single pole double throw switch configured to selectively pass an RF signal from the input node to the output node by way of one of said high pass network and said low pass network. Furthermore, the first and second single pole double throw switches are configured to select between the high pass network and the low pass network based on a single control signal having a voltage greater than or less than a reference voltage.
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Christopher D Grondahl from Gilbert, AZ, age ~64 Get Report