Title:
GENERAL-PURPOSE WIDEBAND AMPLIFIER
Document Type and Number:
WIPO Patent Application WO2005119907
Kind Code:
A3
Abstract:
A single-stage amplifier includes (1) first and second "gain" transistors coupled in a common source configuration, (2) first and second resistors providing self-biasing for the first and second transistors, respectively, (3) first and second current sources providing bias currents for the first and second transistors, respectively, and (4) a load impedance coupled between the drains of the first and second transistors. The amplifier may further include (5) third and fourth "compensation" transistors coupled in parallel with, and used to compensate parasitic capacitances of, the first and second transistors, respectively, and (6) third and fourth resistors providing self-biasing for the third and fourth transistors, respectively. Variable gain may be achieved by varying the bias currents for the gain transistors. A two-stage amplifier may be formed with two stages coupled in cascade, with each stage including most or all of the circuit elements of the single-stage amplifier.
Inventors:
ZHANG XUEJUN (US)
ZHOU JIANJUN (US)
ZHOU JIANJUN (US)
Application Number:
PCT/US2005/019682
Publication Date:
March 30, 2006
Filing Date:
June 02, 2005
Export Citation:
Assignee:
QUALCOMM INC (US)
ZHANG XUEJUN (US)
ZHOU JIANJUN (US)
ZHANG XUEJUN (US)
ZHOU JIANJUN (US)
International Classes:
H03F3/45; H03F1/42; H03F3/21; H03G1/00
Foreign References:
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