A Field Programmable Gate Array Based High Resolution Pulse Programmer

A.B.M Shafiul, Azam and Ahmad Jamal, Salim and Abdul Hamid, Hamidon (2005) A Field Programmable Gate Array Based High Resolution Pulse Programmer. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

To construct a pulse programmer with very short duration, it is first needed to design an internal clock, a coincidence and a synchronization circuit. The internal clock consists of a 1 MHz oscillator, some resistors and transistors (medium speed) to produce a symmetric square wave and impedance matching to the remaining circuit. A coincidence circuit used to select the position of the delayed pulses. It can be constructed with two NOR gates and one NAND gate. A synchronization circuit will be used to remove timing error that will accumulate in the preceding circuitry- the output 90° and 180° pulses. Later it will be synchronized with the time base. This circuit will be combined together with other sets to construct a versatile Pulse Programmer, which will be able to produce the standard pulse sequence required for pulsed nuclear magnetic resonance spectroscopy. Both positive and negative 4 V trigger pulses are produced that are fully synchronous with a crystal-controlled time base and the pulse programmer may be phase-locked with a maximum pulse jitter of 3 ns to the oscillator of a coherent pulse spectrometer.

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