LOW POWER, UNIFORM FREQUENCY RESOLUTION AND HIGH SAMPLING SPEED ARBITRARY WAVEFORM GENERATOR

摘要

A Low Power, Constant Frequency Resolution, High Sampling Speed Arbitrary Waveform generator is invented by using a high- performance 32-bit MCU. It has been implemented using ARM Cortex M3/M4 core. The entire user application program and waveform generation program is designed to run on a single chip which reduces the cost considerably. The 32-bit General purpose registers are being used as phase accumulator, frequency & phase registers which aids to maintain high sampling rate and constant frequency resolution. Internal Static Random-Access Memory (SRAM) is used to store the sampling data. The algorithm is implemented in assembly using THUMB instruction set. The invention supports a maximum of 16-bit resolution which complies with industry standard 14-bit resolution. The waveform is generated using Direct Digital Synthesis (DDS), while all the components and required modules are integrated in a single Printed Circuit Board. An on-board Rail-to-Rail power supply circuit has been designed to power the operational amplifiers.