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CMOS RF Transmitter Using Pulsewidth Modulation for Wireless Smart Sensors

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4 Author(s)
Wanghoon Lee ; Japan Sci. & Technol. Agency, Tokyo, Japan ; Takao, H. ; Sawada, K. ; Ishida, M.

This paper presents the radio frequency (RF) transmitter using pulsewidth modulation (PWM) method. The proposed transmitter can perform with lower power consumption compared to other RF transmitters using a conventional ring oscillator because the proposed voltage-controlled oscillator (VCO) is operated by ON-/OFF-time of the PWM signal. Moreover, the proposed VCO with a metal-oxide semiconductor switch can reduce the power consumption significantly due to the reduction of idle current loss. The power dissipation of the transmitter is measured as 0.75 mW at a carrier of 315 MHz. The transmission of the modulated signal is performed by the on-chip antenna with bond-wire inductor. The on-chip antenna has gain of -34.33 dBi. The radiated power is measured as -32.3 dBm at a distance of 10 cm between the receiver and the transmitter.

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Components, Packaging and Manufacturing Technology, IEEE Transactions on  (Volume:2 ,  Issue: 9 )