HIGH-SPEED DIRECT SINE WAVE SIGNAL SYNTHESISER Russian patent published in 2008 - IPC H03B19/12 

FIELD: physics, radiotechnics.

SUBSTANCE: the synthesiser contains a frequency selection device, the outputs of which are connected to the first input of the first N-bit adder and the second input of the second N-bit adder, as well as a clock oscillator and a frequency halver connected in series, the outputs of which are connected to the third and second inputs of the first, second, and third shift registers, respectively. The output of the first register is connected to the first input of the second adder, the output of which is connected to the first input of the second register, to the first input of the third shift register, and the second input of the first adder, the output of which is connected to the first input of the first register. The output of the third register, through the first read-only memory (ROM) device, and the output of the second register, through the second ROM, are connected, respectively, to the first and second inputs of the multiplexer, the output of which is connected to a digital-to-analogue converter. The frequency halver output is connected to the third input of the multiplexer.

EFFECT: increase in maximum sine wave signal frequency by two.

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