SumBiquad

Two input sum stage with multi-mode second-order filter.

Parameters

corner_frequency

gain_input1

gain_input2

quality_factor

Options
input2_polarity \( \in \{ \) NONINVERTING \( , \) INVERTING \( , \) INPUT_DISABLED \( \} \)

filter_type \( \in \{ \) LOWPASS \( , \) HIGHPASS \( , \) BANDPASS \( \} \)

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

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

Inputs

input1 Half-Cycle

input2 Half-Cycle

Outputs

output Continuous

Transfer Function

$$ V_{out} = \frac{\beta}{s^2 + \frac{2\pi f_c}{Q}s + 4\pi^2 f_c^2} \\~\\ \beta = \alpha \pm 4\pi^2f_c^2G_2V_{in2}(s) \\~\\ \alpha = \begin{cases} -4\pi^2f_c^2G_1V_{in1}(s) & \text{if LP} \\ -G_1V_{in1}(s)s^2 & \text{if HP} \\ -2\pi f_c \frac{G_1}{Q}sV_{in1}(s) & \text{if BP} \\ \end{cases} $$

Analog Resource Usage

$$ \begin{array}{|c|c|} \hline \text{Opamps} & \text{2 of 8} \\ \hline \text{Capacitors} & \text{8 of 32} \\ \hline \end{array} $$

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