Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2005-07-08
2008-03-04
Vuong, Quochien B. (Department: 2618)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C330S129000, C330S285000
Reexamination Certificate
active
07340228
ABSTRACT:
An RF transmitter having an RF power amplifier comprising: 1) a drive transistor that receives an input RF signal and generates an output RF signal; and 2) a drain bias adaptation circuit for supplying drain current to the drive transistor. The drain bias adaptation circuit comprises: i) a first switch for coupling the drive transistor drain to a system supply voltage; ii) a second switch for coupling the drive transistor drain to a high supply voltage that is greater than the system supply voltage; iii) a first bypass capacitor coupled to the first switch for reducing noise in the drain current when the first switch is closed and the second switch is open; and iv) a second bypass capacitor coupled to the second switch for reducing noise in the drain current when the second switch is closed and the first switch is open.
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Brobston Michael L.
Monroe Robert W.
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