Post History
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...
#2: Post edited
by
JYelton
·
2023-04-06T23:48:39Z (about 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
JYelton
·
2023-04-06T23:48:02Z (about 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?