Patent ID: 6333649
Filing Date: 2001-12-25
Classification: G06F,H03B

Abstract:
A circuit arrangement for direct digital synthesis, comprising:a phase accumulator having an input port and an output port;a quantizer having an input port and an output port, the input port coupled to the output port of the phase accumulator;a lookup table having first and second output ports and an input port coupled to the output port of the quantizer, the lookup table configured and arranged to output on the first output port a first value being a sine function of an input value to the lookup table and output on the second output port a second value being a cosine function of the input value; anda feed-forward error-correction circuit having input ports coupled to the output ports of the phase accumulator, the quantizer, and the look-up table, the error-correction circuit arranged to determine the error as a function of an input value to and an output value from the quantizer, and to correct the error as a function of output values from the lookup table.