VOLTAGE-CONTROLLED OSCILLATOR (VCO) AS FIRST STAGE IN AN ANALOG-TO-DIGITAL CONVERTER (ADC) IN COMBINATION WITH A DIGITAL FILTER FOR SECOND OR HIGHER-ORDER NOISE SHAPING
CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.;ZANBAGHI, Ramin;BRENNAN, Aaron;MELANSON, John, L.
发明人:
ZANBAGHI, Ramin,BRENNAN, Aaron,MELANSON, John, L.
申请号：
WO2016US38271
公开号：
WO2017011145(A1)
申请日:
2016.06.19
申请国别(地区):
世界知识产权组织国际局
年份:
2017
代理人:
摘要：
A delta-sigma modulation analog-to-digital converter (ADC) may be constructed by combining a VCO used for a first order filter with a digital loop filter used for a second or higher order of the ADC. One such ADC would include an analog input node configured to receive an analog signal; a voltage-controlled oscillator (VCO) comprising a first input configured to receive the analog signal, wherein the voltage-controlled oscillator is configured to implement a first order noise-shaping function; a digital loop filter comprising a second input configured to receive an output of the voltage-controlled oscillator (VCO); and a digital output node configured to output a digital signal based on an output of the digital loop filter. The digital loop filter may be configured to implement at least a first order noise-shaping function, but may also implement higher order noise-shaping functions.
