Patent ID: 6072995
Filing Date: 2000-06-06
Classification: H03F

Abstract:
In a wireless communications system having a plurality of portable devices in communication therewith, said portable devices including a transmitter circuit therein, circuitry within a given one of said portable devices for adjustably controlling current levels to said transmitter circuit therein, said circuitry comprising:a digital-to-analog converter for converting a digital input signal to an analog signal corresponding thereto, said converter producing a multiplicity of discrete analog signals adjustably controlled by said digital input signal;a mirror circuit, connected to said converter, for receiving said discrete analog signals therefrom and forwarding an adjusted analog signal to said transmitter circuit; anda transistor between said converter and mirror circuit connection, the base of said transistor being connected to said converter, the emitter of said transistor being connected to said mirror circuit, and the collector of said transistor being connected to a voltage source.