| ??? 03/15/10 18:45 Read: times |
#174163 - clamps Responding to: ???'s previous message |
Manju Arun said:
I have to give opamp+ filter output to an ADC which is an in built one of a PIC micro controller.The ADC won't accept ac. In order to make it DC I need to include one clamping cicuit. But our whole system is designed with very low power. For this particular application what kind of clamping should I employ? Clamping is also called "DC restore." It's used when you AC couple two circuits and you need to establish a DC reference. The best example of this is with video signals, which are AC coupled and you clamp during the sync times to establish the black level. As for the PIC's ADC, well, no ADC specifically accepts AC, in the sense that at every sampling instant the converter takes whatever is on its input and performs the conversion. As long as the input signal is within the range of the converter, then all's well. But you must consider that if you're sampling AC you must abide by Nyquist and ensure that your sampling frequency is fast enough. -a |
| Topic | Author | Date |
| Clamper for ADC | 01/01/70 00:00 | |
| Clamping is something different | 01/01/70 00:00 | |
| Sample and Hold | 01/01/70 00:00 | |
| clamps | 01/01/70 00:00 | |
Nyquist not always a limiting factor | 01/01/70 00:00 |