Power amplifier for a radio frequency signal
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United States of America Patent
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-
Feb 12, 1991
Grant Date -
N/A
app pub date -
Oct 2, 1989
filing date -
Nov 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power amplifier is provided for amplifying a radio frequency signal such as in a burst modulation manner for use in GSM cellular radio. The amplifier has means, such as a ROM (16), for producing a predetermined sequence of values in response to a control pulse. Means (21) are provided for converting each value into a power control signal, and control means (9) are provided for controlling the amplifier output power in accordance with said power control signal. In this manner, the power/time characteristic can be made to take the form of a raised cosine. The invention also provides power selection means for selecting a nominal output level from a plurality of discrete levels and for selecting power sub-levels offset from said selected level. An indication is recorded as to which sub-level best represents the nominal power level.
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