FilterBiquadBandstop

A second-order bandstop filter.

Parameters

corner_frequency

dc_gain

high_frequency_gain

quality_factor

Options
filter_topology \( \in \{ \) TYPE_I \( , \) TYPE_II \( , \) UNDEFINED \( \} \)

opamp_mode \( \in \{ \) DEFAULT \( , \) CHOPPER_STABILIZED \( \} \)

Inputs

input Continuous

Outputs

output Continuous

Low-frequency Variant

FilterBiquadBandstopLF : a version of this module that uses additional hardware resources to extend its low-frequency range.

Transfer Function

$$ \frac{V_{out}(s)}{V_{in}(s)} = \frac{-G_{hf}s^2 - 4\pi^2 f_c^2 G_{dc}}{s^2 + \frac{2\pi f_c}{Q}s + 4\pi^2 f_c^2} \\ f_{notch} = f_c\sqrt{\frac{G_{dc}}{G_{hf}}} $$

Analog Resource Usage

$$ \begin{array}{|c|c|} \hline \text{Opamps} & \text{2 of 8} \\ \hline \text{Capacitors} & \text{8 of 32} \\ \hline \end{array} \\~\\ \text{Low Frequency Variant:} \\ \begin{array}{|c|c|} \hline \text{Opamps} & \text{2 of 8} \\ \hline \text{Capacitors} & \text{16 of 32} \\ \hline \end{array} $$

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