Operational Amplifier Stability - Part 5 of
15: Real-World Design Of A Single Supply Buffer Circuit
by Tim Green
Strategic Development Engineer, Burr-Brown Products from Texas Instruments
Incorporated
This part of the series focuses on a "real-world" application
where our tricks and rules-of-thumb learned up until now will pay off in
helping us easily stabilize an otherwise complicated circuit. We will design
a universal single-supply buffer amplifier (to buffer a 2.1 V to 4.1 V reference)
capable of operating linearly from a single 5-V supply, providing high output
current (> 13mA) and swinging to within 0.4 V of the rail over an operating
temperature range of -40°C to +125°C. Although this circuit may
be used for many applications, a brief history of what spurred this design
is presented and why no off-the-shelf circuit could be found to do the job.
The synthesis techniques used here to develop the component networks to
provide a stable circuit will prove useful for many op amp applications.
...download complete article here (949k PDF file)
...download complete Part 4 here (500k PDF file)
...download complete Part 3 here
(416k PDF file)
...download complete Part 2 here (515k PDF file)
...download complete Part 1 here (450k PDF file)