Title:
SYSTEM AND METHOD FOR ESTABLISHING THE INPUT IMPEDANCE OF AN AMPLIFIER IN A STACKED CONFIGURATION
Document Type and Number:
WIPO Patent Application WO2004021562
Kind Code:
A3
Abstract:
A circuit for establishing the input impedance of an amplifier includes an amplifier (12), a circuit component (14), a first feedback resistor (18), and a second feedback resistor (20). The amplifier has an input impedance (26) and is coupled to a load (72) having a load impedance. The circuit component (14) is coupled to the load (72) and shares at least a portion of a bias current (24) with the amplifier (12). The first feedback resistor (18) is coupled to the amplifier (12) and the load (72), and has a first impedance (ZF1). The second feedback resistor (20) is coupled to the amplifier (12) and has a second impedance (ZF2). The input impedance (26) of the amplifier is established based at least in part upon the first impedance (ZF1) and the second impedance (ZF2).
Inventors:
BEUMER KIM E
Application Number:
PCT/US2003/026374
Publication Date:
July 29, 2004
Filing Date:
August 22, 2003
Export Citation:
Assignee:
MICROTUNE TEXAS LP (US)
International Classes:
H03F3/45; (IPC1-7): H03F3/45; H03F1/56
Foreign References:
| EP1119100A2 | 2001-07-25 | |||
| US4118731A | 1978-10-03 | |||
| US6438365B1 | 2002-08-20 | |||
| US6255889B1 | 2001-07-03 | |||
| US6400777B1 | 2002-06-04 | |||
| US6304142B1 | 2001-10-16 | |||
| US5382919A | 1995-01-17 |
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