Comments on: Design a Differential Amplifier the Easy Way with Mathcad

By: Adrian S. Nastase

Adrian S. Nastase — Thu, 02 Mar 2023 22:52:58 +0000

Use the calculator I have here:
Differential Amplifier Calculator (https://masteringelectronicsdesign.com/differential-amplifier-calculator-2/)

By: Ayyappan A

Ayyappan A — Mon, 20 Feb 2023 14:00:17 +0000

Hi ,

In my difference amplifier configuration the DAC ouput(120mv to 3.4v) is feed
to inverting terminal of opamp and 2.5Vref is applied to non-inverting terminal. The opamp output should be +10V for 120mv input along with 2.5vref and -10V for 3.4 input along with 2.5 Vref.
can i use same transfer function. please advice me.

Thanks
Ayyappan

By: Adrian S. Nastase

Adrian S. Nastase — Thu, 25 Feb 2016 06:23:15 +0000

In reply to Andy Fierman. Thank you, Andy, for you comment. I was not aware of this math program. I will check it in the next few days.

By: Andy Fierman

Andy Fierman — Mon, 22 Feb 2016 10:07:14 +0000

A free and cross-platform (i.e. it works on Linux) Mathcad-like alternative is:

http://en.smath.info/

which also has a cloud version.

It is not as extensive as Mathcad but it is very like Mathcad to use and should handle the Mathcad calculations given here.

By: taher benisa

taher benisa — Fri, 18 Jul 2014 23:42:05 +0000

Great article. Precise and brief. Great job

By: Adrian S. Nastase

Adrian S. Nastase — Mon, 08 Feb 2010 07:52:14 +0000

In reply to arun.

Mathcad is owned and distributed by PTC. Here is the link:

http://www.ptc.com/products/mathcad/

They have a trial version and also a student version. I am not aware of any Linux version.

By: arun

arun — Mon, 08 Feb 2010 04:21:38 +0000

where can i get Mathcad.Is there a Mathcad equivalent that works on Linux.

By: Adrian S. Nastase

Adrian S. Nastase — Sat, 28 Nov 2009 23:43:57 +0000

I used Mathcad 2001. However, any version between 2001 and Mathcad 14 would work the same.

By: Mathcad-user

Mathcad-user — Sat, 28 Nov 2009 07:44:48 +0000

Which Mathcad version did you use?

By: Adrian S. Nastase

Adrian S. Nastase — Wed, 25 Nov 2009 06:17:14 +0000

A negative resistance is theoretical. The system of equations has a solution, but the solution is negative. It means that your design needs an extra source of energy in order to output the voltage range you need for the given input range. In practice, you have two choices: change the reference voltage, or change the amplifier topology. A lot of times it is easier to change the reference value than to change the op amp configuration. This method is great because it lets you find the correct resistor values by trying different voltage references.