Modulator
AssigneeRenesas Technology Corp.
InventorsTakashi Okuda, Toshio Kumamoto, Yasuo Morimoto
Life of this patent
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Abstract
In a modulator, an attenuator attenuates an input signal, a delay element gives a delay of 1 sample period to the attenuated signal, an adder subtracts a quantized signal that has been fed back with a delay of 1 sample period, from the delayed signal, two or more integrators integrate a result of the subtraction, an adder which adds outputs of the respective integrators and the attenuated signal, and a quantizer quantizes a result of the addition, outputs a result of the quantization as an output signal and feeds back the output signal to the subtractor.
Claims4
A modulator that employs an over-sampling delta-sigma conversion system, the modulator comprising:
- an attenuating unit which attenuates an input signal to produce an attenuated signal;
- a delay unit which gives a delay of 1 sample period to the attenuated signal to produce a delayed signal;
- a subtracting unit which subtracts a quantized signal that has been fed back with a delay of 1 sample period from the delayed signal to produce a subtracted signal;
- integrating units provided in n-stages, where n is an integer is equal to or larger than 2, which integrate the subtracted signal to produce integrated signal;
- an adding unit which adds the integrated signal output from each integrating unit and the attenuated signal to produce an added signal;
- and
- a quantizing unit which quantizes the added signal to produce an output signal, outputs the output signal and feeds back the output signal to the subtracting unit.
Dependencies are inferred from the claim text.