NI Circuit Design Community Blog
-
bikeron
on:
New International Rectifier Components in Multisim 14.0
-
giondoo77
on:
Creating Custom Arduino Shields With NI Multisim
- robo_Jeff on: Multisim Touch for iPad Now Available
-
doa4378
on:
New Models for Photovoltaic Cells in Multisim
- Mahmoud_W on: Connectors for NI 78xxR Multifunction RIO series in Multisim
- Mahmoud_W on: Search for Components in Digi-Key's Database While Building Your Circuit in Multisim
-
BMac
on:
Ultiboard Mating PCB Design of the new NI GPIC Platform for Energy Applications
-
Henry_Lavery
on:
Automotive Application: Hall Effect Sensor in Multisim
- GarretF on: LabVIEW-Multisim Co-Simulation with Variants and Hierarchical Blocks (Part 2)
-
Control_Dir
on:
Adding 3D Information in Ultiboard
Application of a High-Precision Low-Noise Instrumentation Amplifier in NI Multisim
Instrumentation Amplifiers (InAmps) play a vital role in low-frequency data acquisition applications. Low-voltage signals in noisy environments require pre-amplifiers that exhibit very high Common Mode Rejection Ratio (CMRR), high input impedance, low output impedance, and excellent noise performance. In some cases, such as in defense electronics, gain drift is a critical parameter to guarantee the system behaves as expected at higher temperatures.
InAmps are a viable choice to meet all these design specifications in the test and measurement world. This is why semiconductor manufacturers have been increasing their portfolio of monolithic InAmp chips. Board designers with such components could save time to meet their design specifications, although in some cases the customization of discrete amplifiers is still needed.
At NI, we work with semiconductor manufacturers to equip Multisim’s library with a large selection of InAmps models and footprint. All these models are provided by leading manufacturers and validated by NI R&D engineers guaranteeing accurate simulation results in Multisim.
AMP01 Aerospace Instrumentation Amplifier from Analog Devices
This is a monolithic instrumentation amplifier by Analog Devices designed for high-precision data acquisition and instrumentation applications. It shows a combination of performance attributes that take the instrumentation amplifier one step further towards the ideal amplifier, datasheet here.
The figure below shows a typical InAmp configuration for driving a 50 Ω loads from the part’s datasheet.
Simulation as a High Performance Non-inverting Operational Amplifier in Multisim
This instrumentation amplifier could also be configured as a high performance operational amplifier. In many applications, this configuration could be a replacement of amplifier-buffer combinations. Some of the advantages of InAmps in such configuration are the low harmonic distortion, improved gain offset drift, and excellent linearity.
This configuration is built in Multisim and performance attributes are analyzed using the simulation and analysis tools in the design environment.
Instrumentation amplifier configuration as a differential amplifier. Drag and drop PNG image into Multisim to load the circuit.
Transient time response of amplifier operation. Output is 2Vp-p
Fourier analysis and a THD of 0.00014%
