Part 1- A voltage reference duel of duals

RE: Part 1- A voltage reference duel of duals

Ying ZHOU — Mon, 22 Sep 2014 15:02:39 GMT

Hi Matt,

Thanks for your comment. The error caused by drift over temp is discussed in Part 2 :-)

Ying

RE: Part 1- A voltage reference duel of duals

M Haglund — Mon, 22 Sep 2014 08:53:45 GMT

Interesting article of a classic challenge!

I would not mind in the upcoming article if you also mention something about drift over time as well.

Cheers

here it is: [View:https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/02/20/ic-long-term-stability-the-only-constant-is-change:1230:0]

RE: Part 1- A voltage reference duel of duals

Ying ZHOU — Sun, 21 Sep 2014 21:44:05 GMT

Hi Neil,

That could be a method to consider. But here, we are targeting at a low-drift system. The REF200 (25ppm/°C, typ) is not as low-drift as the reference voltages we proposed here. :-)

Thanks,

Ying

RE: Part 1- A voltage reference duel of duals

Ying ZHOU — Sun, 21 Sep 2014 21:28:45 GMT

Hi Rookie, John,

You are right. The INA topology I showed was not correct. I just updated the graph. Thanks for pointing this out! :-)

Ying

RE: Part 1- A voltage reference duel of duals

Neil Albaugh — Sun, 21 Sep 2014 17:58:21 GMT

A constant current in a fixed resistor generates a constant voltage. By using a REF200 a voltage reference of microvolts to volts can be easily generated. A "4th Method"?

RE: Part 1- A voltage reference duel of duals

John Handwork — Sun, 21 Sep 2014 17:07:55 GMT

Rookie,

Figure 1 can't work because it wasn't transcribed from TIPD156 properly where you'll find a complete difference amplifier with all 4 resistors.

Ying,

Could you update Figure 1 to accurately reflect the circuit in TIPD156? If the intent was to try to simplify the illustration, it didn't help. :-)

RE: Part 1- A voltage reference duel of duals

Rookie — Sun, 21 Sep 2014 16:42:18 GMT

I don't understand how the circuit in Figure 1 could function properly

RE: Part 1- A voltage reference duel of duals

Ying ZHOU — Sat, 20 Sep 2014 23:17:19 GMT

Hi Soufiane,

Thanks for your suggestion. I'll consider the idea of discussing the noise impact on data converters. :-)

RE: Part 1- A voltage reference duel of duals

Soufiane Bendaoud — Wed, 10 Sep 2014 06:33:23 GMT

Well written, clear and concise, thank you. Consider a follow up on the noise impact on data converters (from a voltage reference)

RE: Part 1- A voltage reference duel of duals

Ying ZHOU — Tue, 09 Sep 2014 04:36:03 GMT

Thanks, Bonnie!

RE: Part 1- A voltage reference duel of duals

Bonnie Baker - WEBENCH Design Center — Thu, 04 Sep 2014 21:47:52 GMT

Ying,

Excellent voltage reference discussion. I like that fact that you presented 3 options that can be used for this application probelm. I am looking forward to your performance comparision.