Transmitting apparatus
AssigneeHitachi Kokusai Electric Inc.
InventorTetsuhiko Miyatani
Life of this patent
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Abstract
The present invention provides a transmitting apparatus equipped with a modulator, a frequency converter that up-converts a modulated signal (or digital IF signal) of a baseband, and an amplifier that amplifies a transmit signal lying in a radio frequency band to a desired signal level. In the transmitting apparatus, a controller including a level determinater and a bias setter is provided with a limiter setter. The level determinater and bias setter of the controller setter perform dynamic bias control of the amplifier. Further, the limiter setter changes the setting of a threshold value of the limiter according to an average level of an input signal.
Claims6
A transmitting apparatus comprising:
- a bias setter which performs dynamic bias control in accordance with an average level of an input signal;
- an amplifier subjected to the dynamic bias control by said bias setter;
- a limiter which limits a peak that appears in the input signal of said amplifier;
- and
- a limiter setter which sets a threshold value of said limiter in accordance with the average level of the input signal,
- wherein said limiter setter lowers the threshold value of said limiter when a saturation point of said amplifier is lowered by the dynamic bias control.
Dependencies are inferred from the claim text.