Patent ID: 8130128
Filing Date: 2012-03-06
Classification: G06F,H03F,H03K,H04B,H04L

Abstract:
1. A circuit device, comprising: a data generator adapted to output a random pulse sequence having a particular spectral shape, the data generator including a sigma-delta modulator that includes a zero input signal, a random noise signal, a quantizer, a noise transfer function defined within a feedback loop, and limiter circuitry coupled within the feedback loop between the output of the feedback loop and the noise transfer function; where a feedback value output by the feedback loop of the sigma-delta modulator is subtracted from the zero input signal of the sigma-delta modulator to produce a first result prior to addition of the random noise signal to the first result to produce a second result; where the second result is provided to the quantizer of the sigma-delta modulator to produce a random pulse sequence at an output of the sigma-delta modulator; and where the random pulse sequence is subtracted from the first result to produce a feedback result that is provided to the noise transfer function of the sigma-delta modulator.