Pulse width modulator quantisation circuit

Details Pulse width modulator quantisation circuit Pulse width modulator quantisation circuit

2007-04-17

2007-04-17

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

11110858

ABSTRACT:
The present invention relates to pulse width modulation (PWM) modulators, especially but not exclusively for digital audio applications; and to quantizers and power switching for the same. The present invention provides a pulse width modulation (PWM) modulator or converter having a guard band quantizer arranged to block low level signal inputs to the modulator in order to prevent narrow width output pulses. This arrangement is particularly advantageous when applied to tri-level PWM modulators, but can also be applied to other level PWM modulators such as bi-level for example. Quantization noise can be reduced by implementing the quantizer in a noise shaper circuit (or possibly a SDM) having loop feedback.

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J. Vanderkooy, “New Concepts in Pulse-Width Modulation”, Presented at AES 97th Convention, San Francisco, Nov. 10-13, 1994.

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