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