HIGH FREQUENCY POWER AMPLIFIER WITH LINEARIZING FEATURE

A radio transmitter circuit comprises a power amplifier (12) a lineariser circuit (10) for maintaining linearity in the power amplifier (12) and a feedback circuit (13) for feeding back a signal from an output of the power amplifier (12) to the linearising means for maintaining linearity, said power...

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Bibliographic Details
Main Authors VALENTINE STEPHEN T, WRAY ANTONY J, BRIDLE MATTHEW Q
Format Patent
LanguageEnglish
Published 31.12.1996
Edition6
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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Summary:A radio transmitter circuit comprises a power amplifier (12) a lineariser circuit (10) for maintaining linearity in the power amplifier (12) and a feedback circuit (13) for feeding back a signal from an output of the power amplifier (12) to the linearising means for maintaining linearity, said power amplifier (12), lineariser circuit and feedback circuit forming a loop having adjustable loop linearisation parameters (for example phase and gain). A look-up table (19) is provided for storing predetermined loop linearisation parameters and a linear controller (18), coupled to the look-up table and the loop. The linear controller selects a loop linearisation parameter in response to a transmit control signal according to an operating condition input, such as battery level, frequency or temperature, at the time of receipt of the transmit control signal. Figure 2 shows an arrangement for detecting adjacent channel interference.
Bibliography:Application Number: PL19930301158