Chu Hsiung Ho

age ~52

from Milpitas, CA

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Saturated Power Amplifier System
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US Patent:

8274336, Sep 25, 2012
Filed:

Sep 29, 2010
Appl. No.:

12/893201
Inventors:

Malcolm Smith - San Jose CA, US
Chu Shiung Ho - Milpitas CA, US
Caesar See-Hoi Wang - Fremont CA, US
Baker Scott - San Jose CA, US
Assignee:

Amalfi Semiconductor, Inc. - Los Gatos CA
International Classification:

H03F 3/04
H03G 3/20
US Classification:

330311, 330136
Abstract:

A saturated power amplifier system has a saturated power amplifier that receives an input signal. The saturated power amplifier has one or more stages, including one or more output stages. Each output stage produces multiple signals which are combined. Each output stage has one or more levels of cascoding including one or more thick oxide devices and one or more thin oxide devices.

Ground Partitioned Power Amplifier For Stable Operation
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US Patent:

8604873, Dec 10, 2013
Filed:

Dec 2, 2011
Appl. No.:

13/310611
Inventors:

Baker Scott - San Jose CA, US
George Maxim - Milpitas CA, US
Stephen Franck - Felton CA, US
Chu Hsiung Ho - Milpitas CA, US
Assignee:

RF Micro Devices (Cayman Islands), Ltd. - Greensboro NC
International Classification:

H03F 1/38
US Classification:

330112, 330 99, 330104
Abstract:

Achievement of robust stability of a power amplifier (PA) that allows the sharing of the ground between the driver stages and the output stage is shown. A controlled amount of negative feedback is used to neutralize the local positive feedback that results from the driver-to-output stage ground sharing in the signal path, for example, a radio frequency (RF) signal path. The solution keeps a strong drive and a good performance of the PA. Exemplary embodiments are shown for the PA positive feedback neutralization. A first embodiment uses a ground signal divider while another embodiment uses a ground signal divider weighting technique.

Power Amplifier Having A Nonlinear Output Capacitance Equalization
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US Patent:

8629725, Jan 14, 2014
Filed:

Dec 2, 2011
Appl. No.:

13/310568
Inventors:

Baker Scott - San Jose CA, US
George Maxim - Milpitas CA, US
Chu Hsiung Ho - Milpitas CA, US
Stephen Franck - Felton CA, US
Tom Biedka - San Jose CA, US
Assignee:

RF Micro Devices (Cayman Islands), Ltd. - Greensboro NC
International Classification:

H03F 3/191
US Classification:

330305, 330310
Abstract:

Power amplifier (PA), regardless of the process used for the manufacturing of its devices, suffers from a nonlinear output capacitance that has significant impact on various aspects of the PA performance. This output capacitance is dependent on the large output voltage swing. Accordingly a compensation capacitance is added at the output of the PA that has a behavior that is inverse respective of the output voltage of that of the output capacitance of the PA. Connecting the compensation capacitor in parallel to the PA output capacitance, results in a total capacitance that is the sum of the output capacitance and its compensation capacitance. The total output capacitance is therefore essentially stable throughout the output voltage swing.