Resumes
Resumes
Shao Shu Phones & Addresses
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8628 Muledeer Dr, Beaverton, OR 97007 (503) 848-9218 (503) 848-9878
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10415 Mockingbird Way, Beaverton, OR 97007
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Portland, OR
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8628 SW Muledeer Dr, Beaverton, OR 97007
Publications
Us Patents
Gain Enhancement Technique For Operational Amplifiers
View pageUS Patent:
54423180, Aug 15, 1995
Filed:
Oct 15, 1993
Appl. No.:
8/138176
Inventors:
Rajeev Badyal - Fort Collins CO
Shao F. Shu - Hillsboro OR
Shao F. Shu - Hillsboro OR
Assignee:
Hewlett Packard Corporation - Palo Alto CA
International Classification:
H03F 345
US Classification:
330253
Abstract:
A folded cascode operational amplifier using an improved gain enhancement technique is described. The folded cascode includes an input section, a cascode current mirror section, and a cascode current section. A first fully-differential operational amplifier is coupled to the cascode current mirror section to provide improved gain enhancement thereto and a second fully-differential operational amplifier is coupled to the cascode current source section to provide improved gain enhancement thereto. The differential inputs of the first fully-differential operational amplifier are coupled to feedback nodes of the cascode current mirror section and the differential outputs of the first fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. The differential inputs of the second fully-differential operational amplifier are coupled to feedback nodes of the cascode current source section and the differential outputs of the second fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. Coupling the feedback nodes of both current sources to a single fully-differential operational amplifier increases the common mode noise rejection of the corresponding section.