Wireless transmission circuit enabling adjustable radio frequency transmission power

Abstract

A wireless transmission circuit enabling adjustable RF transmission power includes a signal modulator-oscillator stage, a power-amplifier stage, and a filter circuit. A bias voltage condition of an output transistor of the signal modulator-oscillator stage or the power-amplifier stage is adjustable via a bias control circuit, so as to adjust an output power of the signal modulator-oscillator stage or the power-amplifier stage. When a wireless input device employing the wireless transmission circuit is used to work within a short distance, a lower transmission power may be selected for it. And, when the same input device is used to work at a remote location, a higher transmission power may be selected to achieve the remote transmission. In this manner, the wireless input device may have effectively extended battery life.

Dependencies are inferred from the claim text.