Progression of states numerically controlled oscillator

Details Progression of states numerically controlled oscillator Progression of states numerically controlled oscillator

1991-08-22

1993-01-12

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328155, 307271, 307261, H03L 700, H03K 500, H03K 513, H03B 1900

Patent

active

051793482

ABSTRACT:
A numerically controlled oscillator includes a number of N-bit adders that perform parallel addition of a frequency setting word to an accumulated output. A first adder adds the frequency setting word to the accumulated output. A second adder adds a multiple of the frequency setting word to the accumulated output. Additional adders may be included to add other multiples of the frequency setting word to the accumulated output. The sum output of the adder in which the highest multiple of the frequency setting word is added is saved as the new accumulated output. The outputs of all the adders are saved and are mutliplexed out in sequence at a predetermined clock rate as a series of input values to a sine lookup table in a ROM. The outputs from the ROM form the digitized samples of a sine wave at the predetermined clock rate. The frequency setting word is applied to the adders at a reduced clock rate that is lower than the predetermined clock rate so that the adders operate at the reduced clock rate. Thus, the digitized samples of the sine wave are output at the predetermined clock rate that is greater than the clock rate at which the adders are required to operate.

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