![]() Using this technology, it is possible to fabricate sensor and oscillator for the WSS concurrently. The technology has been used for fabrication of devices such as sensors and circuits in our group. The proposed ring oscillator was fabricated by 2.5 m m CMOS technology. Moreover, using the input PWM signal with lower duty cycle allows operating with lower power consumption. The useless power dissipation can be reduced during the OFF period of the input PWM signal. The proposed oscillator is operated in ON period of the input PWM signal due to NAND logic of the oscillator. However, the proposed oscillator does not need the switch device as shown in Fig. Then, the controlled carrier is transferred to antenna by the switch device such as MOS. RF transmission using conventional ring oscillator must be always turned on for switched operation as PWM signal. Using the oscillator with NAND gate, it is possible to reduce the useless power consumption because the operation of the oscillator can be controlled. For a pulse train in which the pulse duration is 1 m s and the pulse period is 4 m s, the duty cycle is 0.25 or 25%. instance, in an ideal pulse train (one having rectangular pulses), the duty cycle is the pulse duration divided by the pulse period. ![]()
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