2008 Volume 128 Issue 1 Pages 7-11
The wireless smart sensors have been proposed not only for high-risk and chronically ill patients but also in the healthcare field. The radio frequency (RF) transmitter is necessary to fabricate wireless smart sensors. This paper presents a proposal of the complementary metal-oxide-semiconductor (CMOS) RF transmitter using pulse width modulation (PWM) method. The major advantage of the PWM is a performance with low consumption power. In this paper, we designed and simulated the circuitry for the transmitter. The proposed transmitter consists of pulse width modulator, oscillator and on-chip antenna. With the transmitter using PWM method, it will be possible that wireless smart sensor perform with lower power consumption than the RF transmitter using conventional ring oscillator.