Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

Post History

71%
+3 −0
Q&A Is a current-dependent current source and a current mirror the same thing?

I have a 4-20 mA digital air pressure regulator which is controlled by and reports its pressure by being the current sink in two independent 4-20 mA current loops. Our control system utilizes Anal...

1 answer  ·  posted 1y ago by JYelton‭  ·  last activity 1y ago by Olin Lathrop‭

#2: Post edited by user avatar JYelton‭ · 2023-04-06T23:48:39Z (over 1 year ago)
  • I have a 4-20 mA digital air pressure regulator which is controlled by and reports its pressure by being the current sink in two independent 4-20 mA current loops.
  • Our control system utilizes [Analog Devices AD4111 ADC](https://www.analog.com/en/products/ad4111.html) which itself sinks current.
  • I've ran into numerous roadblocks in trying to develop a converter or circuit to allow us to adapt to the regulator that sinks instead of sources current. For example, we've unsuccessfully attempted to add a simple opamp + BJT circuit to act as a repeater of sorts.
  • Researching this further, I've been trying to determine what the correct terminology would be for a circuit that fulfills this purpose.
  • Would a "current-dependent current source" (CDCS?) be the correct circuit for this? (I've also seen "current-controlled current source (CCCS).) Is a "current mirror" the same thing? Does the terminology change when the controlling-side current is sinked (sunk?) by an external device versus within the CDCS itself?
  • I have a 4-20 mA digital air pressure regulator which is controlled by and reports its pressure by being the current sink in two independent 4-20 mA current loops.
  • Our control system utilizes [Analog Devices AD4111 ADC](https://www.analog.com/en/products/ad4111.html) which itself sinks current.
  • I've ran into numerous roadblocks in trying to develop a converter or circuit to allow us to adapt to this regulator which sinks instead of sources current. For example, we've unsuccessfully attempted to add a simple opamp + BJT circuit to act as a repeater of sorts.
  • Researching this further, I've been trying to determine what the correct terminology would be for a circuit that fulfills this purpose.
  • Would a "current-dependent current source" (CDCS?) be the correct circuit for this? (I've also seen "current-controlled current source (CCCS).) Is a "current mirror" the same thing? Does the terminology change when the controlling-side current is sinked (sunk?) by an external device versus within the CDCS itself?
#1: Initial revision by user avatar JYelton‭ · 2023-04-06T23:48:02Z (over 1 year ago)
Is a current-dependent current source and a current mirror the same thing?
I have a 4-20 mA digital air pressure regulator which is controlled by and reports its pressure by being the current sink in two independent 4-20 mA current loops.

Our control system utilizes [Analog Devices AD4111 ADC](https://www.analog.com/en/products/ad4111.html) which itself sinks current.

I've ran into numerous roadblocks in trying to develop a converter or circuit to allow us to adapt to the regulator that sinks instead of sources current. For example, we've unsuccessfully attempted to add a simple opamp + BJT circuit to act as a repeater of sorts.

Researching this further, I've been trying to determine what the correct terminology would be for a circuit that fulfills this purpose.

Would a "current-dependent current source" (CDCS?) be the correct circuit for this? (I've also seen "current-controlled current source (CCCS).) Is a "current mirror" the same thing? Does the terminology change when the controlling-side current is sinked (sunk?) by an external device versus within the CDCS itself?