Wireless transmission circuit enabling modulation of radio frequency power amplification

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.

Dependencies are inferred from the claim text.