Amplifiers – With amplifier condition indicating or testing means
Patent
1999-02-05
2000-03-28
Pascal, Robert
Amplifiers
With amplifier condition indicating or testing means
330127, 455115, G01R 1900, H03G 300, H03C 162
Patent
active
060437065
ABSTRACT:
A method is provided for controlling the quiescent current of a power amplifier in a wireless communication device, the amplifier configured to amplify an applied communication signal and employing biasing controlled by a reference voltage. In a preferred embodiment, the method includes: measuring the operating current of the communication device with no communication signal applied to the amplifier and with the reference voltage set to zero, increasing the reference voltage, while continuing to measure the operating current, until the difference between the operating current at a particular reference voltage and the operating current with the reference voltage set to zero reaches a pre-selected current value, and storing a digital value corresponding to the particular reference voltage. The pre-selected current value is preferably determined by characterizing a sufficient sample of amplifiers (e.g., based on model or production lot) to determine a minimum amplifier quiescent current adequate to meet desired performance characteristics for a particular system or application.
REFERENCES:
patent: 5059921 (1991-10-01), Vyne et al.
patent: 5311143 (1994-05-01), Soliday
patent: 5483682 (1996-01-01), Norimatsu
patent: 5652547 (1997-07-01), Mokhtar et al.
Karpus Thomas J.
Muhlbauer Teresa A.
Nowak Michael E.
Ericsson Inc.
Nguyen Patricia T.
Pascal Robert
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