Wireless transmission circuit enabling modulation of radio...

Details Wireless transmission circuit enabling modulation of radio... Wireless transmission circuit enabling modulation of radio...

2002-03-21

2008-01-22

Maung, Nay (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S127100, C455S127200, C455S126000, C345S163000

Reexamination Certificate

active

07321753

ABSTRACT:
A wireless transmission circuit enabling modulation of RF power amplification includes a signal processing circuit for outputting a signal that is modulated and then amplified at a cascade power amplification circuit including a plurality of power stages, and is then wirelessly transmitted to and received by a computer system. The wireless transmission circuit includes at least a power-setting unit for controlling a specific number of power stages included in the power amplification circuit to be used in the power amplification of the modulated signal. When a wireless input device employing the wireless transmission circuit is used within a short transmission distance, a lower transmission power is selected via the power-setting unit; and when the wireless input device is used at a long transmission distance, a higher transmission power may be selected to achieve the remote transmission. The wireless input device could therefore have extended battery life.

REFERENCES:
patent: 6400301 (2002-06-01), Kulhalli et al.
patent: 6630867 (2003-10-01), Canyon et al.
patent: 6681101 (2004-01-01), Eidson et al.
patent: 6687511 (2004-02-01), McGowan et al.
patent: 6697617 (2004-02-01), Liebenow
patent: 6775525 (2004-08-01), Tanoue et al.
patent: 6845246 (2005-01-01), Steer
patent: 6933922 (2005-08-01), Casebolt et al.

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