| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 99 === The impulse generators are the widely used circuit modules. Especially applied in the impulse triggered flip-flops and the communication systems. In the impulse triggered flip-flops design, as compared to the traditional master-slave flip-flops, the impulse triggered flip-flops can reduce system power consumption about 30% due to its low complexity. In the communication system design, the impulse signal has a relatively good penetration and suitable for a short-range of the indoor communications. The modulation method can be the pulse amplitude modulation (PAM) and the pulse position modulation (PPM).
In this thesis, five adjustable impulse generator circuits have been proposed. The structure of the circuit is a NAND gate with a delay circuit at its input. By adjusting the circuit’s charging / discharging current through the NAND gate, the delay time of the signal can be adjusted. Consequently, the impulse width can be changed. This proposed circuit featured with simple circuit architecture, adjustable impulse width, and lower power consumption.
All the proposed circuits have been simulated with HSPICE circuit simulation software and the TSMC N-Well 0.35um 2P4M process parameters were used. Simulation results are given to confirm the validity of the theory analysis. These circuits can also be used in digital circuit systems. When the frequency is 50MHz and the supply voltage is 3.3v, the maximum output impulse width is 3800ps while the smallest width is 350ps. Moreover the average power consumptions are all less than 200mW.
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