Circuit arrangement for adjusting the impedance of a differential active component
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
May 31, 2001
app pub date -
Mar 9, 1999
filing date -
Mar 11, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The active component (400, 500) of a radio device comprises a first transistor (Q1) and a second transistor (Q2). The differential input of the active component comprises a first input line (RF+) and a second input line (RF-), of which the first input line is coupled to the base of the first transistor (Q1) and the second input line is coupled to the base of the second transistor (Q2). In order to match the input impedance there is cross-feedback (Rfb') between the first transistor (Q1) and the second transistor (Q2).
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