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Per Westermark
11/08/11 06:18
Read: 363 times
Sweden


 
#184587 - You sure?
Responding to: ???'s previous message
John M said:
My electronics-self says I should match the ADC input impedance to the sensor(analog signal)'s output impedance. I shall choose the resistors to match the sensor's output impedance.

Impedance matching is a great way to maximize the amount of power.

But think about that again. When you buy an expensive multimeter - does it have a setting where it allows you to adapt the impedance, or does it just settle for a high impedance to reduce the amount it will affect the measurement circuit?

So in your case - are your system designed for transfer of energy, or is it a system intended to sense the value of a signal?

Next thing - do you expect big problems with reflections of your 4kHz input signal?

List of 13 messages in thread
TopicAuthorDate
Looking for 8051 that supports high speed I2C      John M      11/02/11 15:22      
   SPI      Per Westermark      11/02/11 16:06      
      gotcha      John M      11/02/11 21:03      
         3.4 MHz I2C      Andy Peters      11/04/11 13:13      
            RE: SPI is simpler      Andy Neil      11/04/11 14:03      
               One other quick question for all you smart people.      John M      11/07/11 20:24      
                  Some things to consider....      Michael Karas      11/08/11 05:11      
                     Full range and clipping      Per Westermark      11/08/11 05:24      
                        Impedance      John M      11/08/11 06:04      
                           You sure?      Per Westermark      11/08/11 06:18      
                           Impedance With Divider      Michael Karas      11/08/11 09:00      
                           Impedance matching      Andy Neil      11/08/11 15:54      
   if I recall      Erik Malund      11/03/11 07:13      

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