发明名称 |
Pulse width modulator quantisation circuit |
摘要 |
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. |
申请公布号 |
GB2449591(B) |
申请公布日期 |
2009.03.18 |
申请号 |
GB20080016236 |
申请日期 |
2005.01.17 |
申请人 |
WOLFSON MICROELECTRONICS PLC |
发明人 |
ANTHONY JAMES MAGRATH |
分类号 |
H03M5/08;H03F3/217;H03M1/82;H03M7/32 |
主分类号 |
H03M5/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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