Power amplifier for a radio frequency signal

Details Power amplifier for a radio frequency signal Power amplifier for a radio frequency signal

H - Electricity

03

G

363/13, 330/38

H03G 3/20 (2006.01) H03F 3/19 (2006.01) H03F 3/20 (2006.01) H04B 7/005 (2006.01) H04J 3/12 (2006.01)

Patent

CA 1317648

ABSTRACT Power Amplifier for a Radio Frequency Signal 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.

613572

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