Programmable gain instrumentation amplifiers (PGIAs) can be tough to set up for maximum efficiency. In this article, read about a newly developed methodology for developing a precise PGIA system.
Depending on the specific amplifier architecture and the pin setup, there could be drawbacks to PGIAs as currently designed. These include:
● Large gain error due to switch on-resistance (RON) nominal value and its variation.
● High gain values may be impossible to achieve due to the low switch RON values required.
● Signal distortion due to switch nonlinearity. That is because signal current flows directly through RON and thus any variation in its value as a function of voltage causes distortion.
These concerns could be alleviated with a versatile instrumentation amplifier like the Analog Devices LT6372, with RG,F and RG,S pins that are separately pinned out. This allows for 4 possible gain values, adding versatility to a design. Click through to the article to find out more about this setup, plus learn more about other considerations in PGIA design, such as:
● Design Steps to Compute External Resistors for Any Gain
● Procedure for Determining the Value of the PGIA
● Measured Performance Plots
● Analog Devices products that meet the needs of modern PGIA designs
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