This method reduces low frequency (1/f) noise and nulls DC offset in slow-changing analog signals. AN66444 provides a brief introduction to CDS and details of its implementation in PSoC 3 and PSoC 5LP. For theory of the CDS technique, see AN2226 - PSoC® 1 - Correlated Double Sampling for Thermocouple Measurement.
The following video explains the correlated double sampling technique that can be used to reduce a low frequency signal and eliminate DC offset in slow changing signals
The following table indicates the PSoC devices, PSoC Creator versions, compilers, and development kits that will work with this application note project:
|
Project |
Device
|
PSoC Creator
Version |
Development Kit
CY8CKIT-xxx |
Compiler
|
|||||||
|
Architecture
|
Silicon
Revision |
V2.1 SP1 or higher |
V2.1/2.0
|
001
DVK |
Keil
|
GCC
|
RVDS
|
MDK
|
|||
|
AN66444.zip |
Prod
|
YES
|
NO
|
YES
|
YES*
|
NO
|
YES
|
N/A
|
N/A
|
N/A
|
|
|
Prod
|
YES
|
NO
|
YES
|
YES*
|
NO
|
N/A
|
YES
|
YES
|
YES
|
||
| AN66444_Archive.zip |
ES2, ES3, Prod
|
NO
|
YES
|
YES
|
YES*
|
NO
|
YES
|
N/A
|
N/A
|
N/A
|
|
|
ES1, Prod
|
NO
|
YES
|
YES
|
YES*
|
NO
|
N/A
|
YES
|
YES
|
YES
|
||
*Refer to Migrating CY8CKIT-001 DVK project to CY8CKIT 030/ 050.
- For PSoC 5 project and related document, please download file AN66444_Archive.zip.
Projects associated with this application note can be downloaded from the ‘Related Files’ section below. For your convenience, we have provided projects that are compatible with the two most recent versions of PSoC Creator:
- AN66444.zip is used with PSoC Creator 2.1 SP1
- AN66444_Archive.zip is used with PSoC Creator 2.1/2.0.
The project’s default settings may not be compatible with your device or kit, and you may need to change your project settings. For more information, see: