Opamps have simplified circuit design for engineers. They form a basic building block for the analog and mixed-signal design. PSoC 1 analog blocks, both continuous time (CT) and switched capacitor (SC) do not have a native opamp mode. They are wired so that they can create PGAs, INSAMPs, Filters, Integrators, and so on. However, in some designs only a plain opamp is required. This application note shows how to configure a switched capacitor block so that it approximates the functionality of an opamp.
The application note discusses the following topics:
- A brief explanation of how an opamp works.
- An explanation of how a switched capacitor integrator can emulate an opamp (faux opamp).
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Examples of faux opamp circuits.
This application note does not give in depth information about switched capacitor blocks. For more information please refer AN2041 PSoC 1 – Understanding PSoC 1 Switched Capacitor Analog Blocks.
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Example Project |
Supported H/W and S/W | Supported PSoC1 Devices | |||||||||
| PSoC Designer Version |
H/W Kit |
CY8C20xxx |
CY8C21xxx |
CY8C22xxx |
CY8C23xxx |
CY8C24xxx |
CY8C27xxx |
CY8C28xxx |
CY8C29xxx |
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| Yes | 5.1 | CY3210-PSoCEVAL1 | x23A, x94 | x43 | x | x66 | |||||