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AN66444 - PSoC® 3 and PSoC 5LP Correlated Double Sampling to Reduce Offset, Drift, and Low Frequency Noise | Cypress Semiconductor

AN66444 - PSoC® 3 and PSoC 5LP Correlated Double Sampling to Reduce Offset, Drift, and Low Frequency Noise

Last Updated: 
Apr 27, 2017
Version: 
*D

AN66444 describes the implementation of correlated double sampling (CDS) in PSoC ® 3 and PSoC 5LP, for DC offset cancellation and noise reduction.

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
030/050
DVK
003/014
FTK
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

Note:
  1. 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: