You are cordially invited to the Mosharaka Remote Seminar with the below details at 17:00 (GMT+2) on Monday 11 January 2021. If you know other colleagues who may be interested in joining us at the Seminar, please send me their email addresses, or ask them to email me. Thank you.

 

 

In oversampled Sigma Delta Analog Digital converters the signal is sampled by a rate which is much higher than Nyquist rate. However, at the output of the modulator, this rate should be decreased to a Nyquist rate. This process is called decimation. The process of decimation introduces aliasing which must be eliminated by a filter called antialiasing filter. The most simple antialiasing filter is comb filter which has all coefficients equal unity and consequently does not need multipliers for its implementation. There are two principal comb structures: recursive and no recursive. The recursive structure is an area efficient structure, while the no recursive structure is a power efficient structure. However, the magnitude characteristic of comb filter does not provide enough alias attenuations and additionally it has a droop in the passband which may deteriorate the decimated signal. Different methods have been proposed to improve comb aliasing rejection and decrease passband droop. We will present some the most popular methods to improve comb filter magnitude characteristic.

 

Speaker: Prof. Gordana Dolecek. Please join the seminar here.