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AD9788芯片中,设置反sinc滤波器的作用是什么?
如下文介绍,参数设定的依据是什么呢? It is designed to provide greater than ±0.05 dB pass-band ripple up to a frequency of 0.4 × fDACCLK. To provide the necessary peaking at the upper end of the pass band, the inverse sinc filter has an intrinsic insertion loss of 3.4 dB. |
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TheDAC output spectrum is shaped by the characteristic sin(x)/x(or SINC) envelope, due to the intrinsic zero-order hold effectassociated with DAC-generated signals.Because the shape ofthe SINC envelope is well known, it can be compensated. This envelope restoration functionis provided bythe optionalinverse SINC filter preceding the DAC. This function isimplemented as an FIRfilter, which has a transfer function thatis the exact inverse of the SINC response.
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