Apparatus and method of stabilizing sigma-delta modulator...

Details Apparatus and method of stabilizing sigma-delta modulator... Apparatus and method of stabilizing sigma-delta modulator...

2007-12-11

2007-12-11

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S126000

Reexamination Certificate

active

11360614

ABSTRACT:
A sigma-delta modulation method with low complexity is provided. To this end, in the present invention, an input signal is forwarded and an output signal is fed back to thus reduce the range of the noise transfer function of the sigma-delta modulator and to lower the frequency offset and the phase noise at low frequencies. A sigma-delta modulator for a frequency synthesizer may include one or more modulation units which are connected in series and perform a sigma-delta modulation to an input signal and a provided accumulated signal using a signal which is weighted with a feedback coefficient; and an output adder which adds an output signal from a terminal section of the modulation units and the input signal, and outputs the added signal for feedback to the modulation units.

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patent: 6057793 (2000-05-01), Gong et al.
patent: 6587063 (2003-07-01), Su
patent: 6600789 (2003-07-01), Lipasti et al.
patent: 10-320075 (1998-12-01), None

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