Baseband continuous time sigma delta analog-to-digital conversion for ADSL applications
作者:Shouli Yan
简介:Almost all earlier high speed ΣΔ modulators with MHz signal bandwidth are implemented with switched-capacitor circuit techniques. Whereas ΣΔ modulators with continuous-time loop filters have the advantages of lower power consumption and intrinsic anti-alias filtering. Moreover, because the sampler of a continuous-time ΣΔ modulator is right in front of the quantizer inside of the noise shaping loop, any sampling error at signal frequencies is greatly suppressed by the high gain of the loop filter together with the quantization noise.
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