Current Feedback Op-Amp

Is there a current feedback operational amplifier such as the AD844 that could be included ?

by cfoa
September 20, 2020

1 Answer

Answer by mrobbins

Figure 28 of the AD844 datasheet provides an equivalent schematic. You can implement this easily as something like this:

You can copy and paste this into your own circuit. For example, let's try to replicate Figure 29, the inverting amplifier:

Run this one and check out the frequency domain simulation. This confirms the 3rd-to-last entry in Table 3 of the datasheet, showing a gain of -10 and a bandwidth of 33 MHz.

+1 vote
by mrobbins
September 21, 2020

Appreciate the answer, however since the circuits I need to simulate require many of these i need it as a building block. It appears to me that this is not possible with circuitlab. Am I correct there?

by cfoa
September 22, 2020

Correct. Copy & paste is the easiest way forward.

You could also probably simplify the internal model if that helped. For example, the low-pass action of Rt and Ct could get bundled into BUF2, switching out CCCS1 for a CCVS.

by mrobbins
September 22, 2020

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.