Nonlinearity robust successive requantizer

Details Nonlinearity robust successive requantizer Nonlinearity robust successive requantizer

2011-07-26

2011-07-26

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

C341S051000, C341S143000, C341S200000

Reexamination Certificate

active

07986250

ABSTRACT:
A successive requantizer, which serves as a replacement for a ΔΣ modulator in a fractional-N PLL or a DAC, and avoids spurious tone problems, thereby circumventing the tradeoffs that result from reliance on the common approach of making highly linear analog circuitry to avoid spurious tones. A successive requantizer fractional-N PLL of the invention has the potential to reduce power consumption and the cost of commercial communication devices. The successive requantizer performs digital quantization one bit at a time in such a way that the quantization noise can he engineered to have desirable properties such as non-linearity robustness. The successive requantizer is applicable to most high-performance digital communication systems, such as cellular telephone handsets and wireless local and metropolitan area network transceivers.

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