| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 98 === In this thesis, an UHF ASK transceiver for the range finder system is demonstrated using 0.18-um CMOS technology. The injection locked technology and frequency multiplier circuits are employed to implement the transmitter. The required injection signal for transmitter to achieve UHF RF signals is provided by a crystal oscillator. As compared with traditional architectures, the advantage of the transmitter lies in that it requires no on-chip phase-locked loop, which eases a miniaturized and low cost design of the transmitter. The experimental results show that the output power of the circuit is -14 dBm at a power consumption of 7 mW. Under the injection-locked condition, the circuit presents a flat phase noise of -116 dBc/Hz over the offset frequency range from 10 kHz to 1 MHz. The die occupies 1.96 mm2 including pads.The ASK receiver consists of a common-gate low noise amplifier、a cascaded gain amplifier、a demodulator、a comparator and a data buffer. The tiny chip area and the low power consumption are the advantages of this architecture which not only reduces the cost of the range finder system, but also extends the battery life. The experimental results show that a sensitivity of -58 dBm and a maximum input power of -30 dBm are achieved at 905 MHz frequency band with a power consumption of 4.1 mW.The die occupies 0.71 mm2 including pads.
Furthermore, the application of the field-plate technology on the ring oscillator is demonstrated in the last part of this thesis. The experimental results show that the 1/f noise is effectively suppressed by the field-plate technology and an improvement of 2~3 dB in the phase noise can be achieved in a 400-700 MHz CMOS VCO.
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