Patent ID: 6661999
Filing Date: 2003-12-09
Classification: H04B,H04W

Abstract:
A method for transmitting data communications through air using a radio comprising:receiving a data input signal; modulating the data input signal; performing a direct sequence spread spectrum operation on the data input signal resulting in a spread data input signal; converting the spread data input signal to a spread radio frequency data signal; amplifying the spread radio frequency data signal with a first amplifier having an adjustable gain control; selectively amplifying the radio frequency data signal with a second amplifier having an adjustable bias current control in accordance with a desired transmission output power, wherein selection of a lower transmission power results in a lower current usage by the second amplifier; selectively detecting a power signal from at least a portion of the radio frequency data signal and a printed circuit board coupler that couples transmission power to a radio frequency detector diode circuit; converting the at least a portion of the radio frequency data signal to an analog error signal by a digital to analog converter; amplifying the radio frequency data signal proportionately with the error signal by adjusting the gain control of the first amplifier to achieve a substantially constant output transmission power over a specified temperature range; transmitting the radio frequency data signal through by at least one antenna.