ROHM BD87521G-LB Non Inverting Amplifier
Specifications
- Product Name: ROHM Solution Simulator
- Features: Excellent EMI Immunity, High Output Drive, Rail-to-Rail Input/Output, CMOS Operational Amplifier
- Simulation Type: Frequency-Domain
- Default Start Frequency: 0 Hz
- Default End Frequency: 100 MHz
This circuit simulates the transient response to a pulse input with voltage follower configured Op-Amps. You can observe the fluctuation of the output voltage when the input voltage is abruptly changed. You can customize the parameters of the components shown in blue, such as VSOURCE, or peripheral components, and simulate the voltage follower with the desired operating condition.
You can simulate the circuit in the published application note: Operational amplifier, Comparator (Tutorial). [JP] [EN] [CN] [KR]
General Cautions
- Caution 1: The values from the simulation results are not guaranteed. Please use these results as a guide for your design.
- Caution 2: These model characteristics are specifically at Ta=25°C. Thus, the simulation result with temperature variances may significantly differ from the result with the one done at actual application board (actual measurement).
- Caution 3: Please refer to the Application note of Op-Amps for details of the technical information.
- Caution 4: The characteristics may change depending on the actual board design and ROHM strongly recommend to double check those characteristics with actual board where the chips will be mounted on.
Simulation Schematic
How to simulate
- The simulation settings, such as parameter sweep or convergence options, are configurable from the ‘Simulation Settings’ shown in Figure 2, and Table 1 shows the default setup of the simulation.
- In case of simulation convergence issue, you can change advanced options to solve. The temperature is set to 27 °C in the default statement in ‘Manual Options’. You can modify it.
Table 1. Simulation settings default setup
| Parameters | Default | Note |
| Simulation Type | Time-Domain | Do not change Simulation Type |
| End Time | 100 µs | – |
| Advanced options | Balanced | – |
| Convergence Assist | – | |
| Manual Options | .temp 27 | – |
Simulation Conditions
Table 2. List of the simulation condition parameters
| Instance Name | Type | Parameters | Default Value | Variable Range | Units | |
| Min | Max | |||||
|
VSOURCE |
Voltage Source |
Initial_value | 0 | VSS | VDD | V |
| Pulse_value | 4 | VSS | VDD | V | ||
| ramptime_initial_to_pulse | 2 | free | µs | |||
| ramptime_pulse_to_initial | 2 | free | µs | |||
| Start_delay | 10 | free | µs | |||
| Pulse_width | 50 | free | µs | |||
| Period | 100 | free | µs | |||
|
VDD |
Voltage Source For Op-Amp | Voltage_level | 5 | 4(Note1) | 15(Note1) | V |
| AC_magnitude | 0.0 | fixed | V | |||
| AC_phase | 0.0 | fixed | ° | |||
(Note 1) Set it to the guaranteed operating range of the Op-Amps.
VSOURCE parameter setup
Figure 3 shows how the VSOURCE parameters correspond to the VIN stimulus waveform.
Op-Amp model
Table 3 shows the model pin function implemented. Note that the Op-Amp model is the behavioral model for its input/output characteristics, and neither protection circuits nor functions unrelated to the purpose are implemented.
Table 3. Op-Amp model pins used for the simulation
| Pin Name | Description |
|---|---|
| +IN | Non-inverting input |
| -IN | Inverting input |
| VDD | Positive power supply |
| VSS | Negative power supply / Ground |
| OUT | Output |
Peripheral Components
Bill of Materials
Table 4 shows the list of components used in the simulation schematic. Each of the capacitors has the parameters of equivalent circuit shown below. The default values of equivalent components are set to zero except for the ESR of C. You can modify the values of each component.
Table 4. List of capacitors used in the simulation circuit
| Type | Instance Name | Default Value | Range (Min) | Range (Max) | Units |
|---|---|---|---|---|---|
| Resistor | R1_1 | 0 | 0 | 10 | kΩ |
| Resistor | RL1 | 10k | 1k | 1M, NC | Ω |
| Capacitor | C1_1 | 0.1 | 0.1 | 22 | pF |
| Capacitor | CL1 | 10 | free, NC | — | pF |
Notes:
- “NC” stands for “Not Connected” or “No Connection”.
- For CL1, “free, NC” suggests it may either be freely chosen or left unconnected.
Capacitor Equivalent Circuits
The default value of ESR is 2 mΩ.
(Note 2) These parameters can take any positive value or zero in simulation but it does not guarantee the operation of the IC in any condition. Refer to the datasheet to determine adequate value of parameters.
Recommended Products
Op-Amp
- BD87521G-LB: 1ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
- BD87522FJ-LB: 2ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
- BD87524FV-LB: 4ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
Technical Articles and Tools can be found in the Design Resources on the product web page.
General Precaution
- Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of nay ROHM’s Products against warning, caution or note contained in this document.
- All information contained in this document is current as of the issuing date and subejct to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the latest information with a ROHM sales representative.
- The information contained in this document is provided on an “as is” basis and ROHMd oes not warrant that all information contained in this document is accurate and/or error-free. ROHM shall no tbe in any way responsible or liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or concerning such information.
Notice – WE
© 2015 ROHM Co., Ltd. All rights reserved.
FAQ
Q: Can I change the simulation type?
A: The default simulation type is Frequency-Domain, and it is recommended not to change this setting.
Q: What is the default start and end frequency for simulation?
A: The default start frequency is 0 Hz, and the end frequency is 100 MHz for simulating the frequency response.
Q: How can I modify the values of components in the simulation?
A: You can customize parameters of components shown in blue, such as VSOURCE, or peripheral components, to simulate the desired operating conditions.
Documents / Resources
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ROHM BD87521G-LB Non Inverting Amplifier [pdf] User Guide BD87521G-LB, BD87521G-LB Non Inverting Amplifier, BD87521G-LB, Non Inverting Amplifier, Inverting Amplifier, Amplifier |
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ROHM BD87521G-LB Non Inverting Amplifier [pdf] User Guide BD87521G-LB, BD87521G-LB Non Inverting Amplifier, Non Inverting Amplifier, Inverting Amplifier, Amplifier |