Antenna driving apparatus

Details Antenna driving apparatus Antenna driving apparatus

2011-04-26

2011-04-26

Payne, David C (Department: 2611)

Pulse or digital communications

Pulse width modulation

C327S031000, C327S172000, C329S312000, C370S205000

Reexamination Certificate

active

07933325

ABSTRACT:
A transmitter portion14includes a control circuit32, a driver circuit33, and a wave detector circuit35. The control circuit32generates control signals Vp, Vn based on a pulsed transmission signal So. The driver circuit33, which is supplied with a battery voltage Vb, generates an output signal Sa to be sent to an antenna13based on the control signals Vp, Vn. The wave detector circuit35outputs a detection signal Sk having a voltage proportional to the level of the output signal Sa (transmission power level). The control circuit32changes the pulse widths of the control signals Vp, Vn based on the voltage level of the detection signal Sk. As a result, electric power consumption is reduced and enlargement of an apparatus is suppressed while maintaining the transmission power level constant.

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