New digital notch filter structures with low coefficient sensitivity
Gong-Tao Yan · IEEE Transactions on Circuits and Systems · 1984
For narrow-band digital notch filters, poles are near the unit circle. Also, when the sampling rate is increased, the poles approach the pointZ = + 1. The usual realizations of digital notch filters are highly sensitive to coefficient quantization. Three new digital notch filter structures are proposed, and their coefficient sensitivities are derived.