Cuurent Source Topology

SANG YUN BANG

Other Parts Discussed in Thread: TIPD107

My name is Sang Yun Bang, and I am a graduate research assistant at New York University.

I am not sure how much information need to provide for the question Meanwhile I briefly explain the issue for now.

We are developing bio-electronics for the research. Especially, in our all-in-one measurement PCB board project, we are facing difficulties on bi-directional current source topology. The component of LTC6082, from Linear Technology, has been used for the previous version. However, since we are targeting 0 to 300nA with the resolution of 1 nA, the topology was unstable to implement on our PCB board.

I would like to have the recommendation from the industries' expert for the TI chip and design.

I will really appreciate any help and suggestion.

over 9 years ago

0 Praveen Aroul over 9 years ago

TI__Guru 50026 points

Hello Sang,

I am moving your post from Medical Forum to Precision Amplifiers Forum. The experts in the forum should be able to provide suggestions for TI amplifiers that could suit your application.

0 SANG YUN BANG over 9 years ago in reply to Praveen Aroul

Prodigy 60 points

Thanks!

0 Collin Wells over 9 years ago in reply to Praveen Aroul

TI__Guru 64245 points

Hello,

So we can see what circuit you've been using please share the circuit schematic for your existing design. Without knowing what circuit you're working with one option would be a circuit similar to the one shown in TIPD107.

To meet your goals, the TIPD107 circuitry needs to be modified to include a negative supply voltage so the output can swing down to 0V. Otherwise the design will not be able to output the near 0A output levels you're asking for as shown in the TIPD107 measured results.

0 SANG YUN BANG over 9 years ago in reply to Collin Wells

Prodigy 60 points

Dear Collin Wells,

First of all, I really appreciate your prompt response.

This is the schematic for our previous design.

After reviewing your suggestion, I have a concern regarding on low-voltage level.

Do you think the low-voltage level can manage output current of 0.2uA to 0.4uA in stable condition?

Thanks,

Amplifiers

Amplifiers forum

Cuurent Source Topology