Model band-limited operational amplifier
Simscape / Electrical / Integrated Circuits
The Band-Limited Op-Amp block models a band-limited operational amplifier. If the voltages at the positive and negative ports are Vp and Vm, respectively, the output voltage is:
A is the gain.
Rout is the output resistance.
Iout is the output current.
s is the Laplace operator.
f is the 3-dB bandwidth.
The input current is:
where Rin is the input resistance.
The block does not use the initial condition you specify using the Initial output voltage, V0 parameter if you select the Start simulation from steady state check box in the Simscape™Solver Configuration block.
+ — Non-inverting input
Electrical conserving port associated with the op-amp non-inverting input
- — Inverting input
Electrical conserving port associated with the op-amp inverting input
OUT — Output voltage
Electrical conserving port associated with the op-amp output voltage
Gain, A — Open-loop gain
The open-loop gain of the operational amplifier.
Input resistance, Rin — Input resistance
The resistance at the input of the operational amplifier that the block uses to calculate the input current.
Output resistance, Rout — Output resistance
The resistance at the output of the operational amplifier that the block uses to calculate the drop in output voltage due to the output current.
Minimum output, Vmin — Minimum output
The lower limit on the operational amplifier no-load output voltage.
Maximum output, Vmax — Maximum output
The upper limit on the operational amplifier no-load output voltage.
Maximum slew rate, Vdot — Maximum slew rate
The maximum positive or negative rate of change of output voltage magnitude.
Bandwidth, f — Open-loop bandwidth
The open-loop bandwidth, that is, the frequency at which the gain drops by 3 dB compared to the low-frequency gain, A.
Initial output voltage, V0 — Initial output voltage
The output voltage at the start of the simulation when the output current is zero.
This parameter value does not account for the voltage drop across the output resistor.