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Huai Gao
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Huai Huai Gao, 625151 Walnut Ave APT 4, Irvine, CA 92604
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5151 Walnut Ave APT 4, Irvine, CA 92604
Morgan Hill, CA
Orange, CA
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Us Patents
Compensation Units For Reducing The Effects Of Self-Heating And Increasing Linear Performance In Bipolar Transistors
US Patent:
7425871, Sep 16, 2008
Filed:
Mar 21, 2005
Appl. No.:
11/087068
Inventors:
Huai Gao - Irvine CA, US
Haitao Zhang - Irvine CA, US
Huinan Guan - Irvine CA, US
Haitao Zhang - Irvine CA, US
Huinan Guan - Irvine CA, US
Assignee:
Regents of the University of California - Oakland CA
International Classification:
H03F 1/30
US Classification:
330289, 330290
Abstract:
The systems and methods described herein provide for composite transistor circuit having a bipolar transistor and a compensation unit. The compensation unit can be configured to stabilize the DC biasing point of the bipolar transistor. The compensation unit can compensate for the self-heating effect in the bipolar transistor and/or improve the linear performance of the bipolar transistor. The compensation unit can include a nonlinear resistor in series with a switch and can be configured to increase the base current into the bipolar transistor as the output voltage of the circuit increases.
Power Amplifier With An Output Matching Network
US Patent:
7602240, Oct 13, 2009
Filed:
Apr 28, 2006
Appl. No.:
11/911800
Inventors:
Huai Gao - Morgan Hill CA, US
Haitao Zhang - Nashua NH, US
Haitao Zhang - Nashua NH, US
Assignee:
The Regents of the University of California - Oakland CA
International Classification:
H03F 1/24
US Classification:
330 98, 330302, 330310
Abstract:
Provided herein is a power amplifier having a multiple stage power amplifier section and an output matching network section. The multiple stage power amplifier section can include multiple power amplifier stages with interstage matching circuits located therebetween. The output matching network can be configured to match the multiple stage power amplifier section at multiple different frequencies or frequency bands. The power amplifier device is capable of selective operation within one of multiple different frequencies or frequency bands.
Multi-Stage Broadband Amplifiers
US Patent:
7652539, Jan 26, 2010
Filed:
Oct 31, 2005
Appl. No.:
11/264291
Inventors:
Huai Gao - Irvine CA, US
Huinan Guan - Irvine CA, US
Li-Wu Yang - Cerritos CA, US
Daniel Yang - Los Angeles CA, US
Huinan Guan - Irvine CA, US
Li-Wu Yang - Cerritos CA, US
Daniel Yang - Los Angeles CA, US
International Classification:
H03F 3/68
US Classification:
330311
Abstract:
Provided herein are multi-stage broadband amplifier configured to achieve a high gain-bandwidth product in a non-distributed architecture and methods for designing the same. The broadband amplifier can include an input stage having a broadband matching unit and an input buffer unit, a gain stage having an RLC network and a amplifier unit and an output stage having a common collector amplifier and an RC compensation unit.
Power Amplifier With A Output Matching Network
US Patent:
2007025, Nov 1, 2007
Filed:
Apr 28, 2006
Appl. No.:
11/380867
Inventors:
Huai Gao - Irvine CA, US
Haito Zhang - Irvine CA, US
Haito Zhang - Irvine CA, US
International Classification:
H03F 3/191
US Classification:
330302000, 330294000
Abstract:
Provided herein is a power amplifier having a multiple stage power amplifier section and an output matching network section. The multiple stage power amplifier section can include multiple power amplifier stages with interstage matching circuits located therebetween. The output matching network can be configured to match the multiple stage power amplifier section at multiple different frequencies or frequency bands. The power amplifier device is capable of selective operation within one of multiple different frequencies or frequency bands.
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