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= Stage 6 Impedance converter
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For maintaining the performance of the ADCs even at high frequencies, it is important to make sure that the ADCs are able to draw power from their inputs. +
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For maintaining the performance of the ADCs even at high frequencies, it is important to make sure that the ADCs are able to draw power from their inputs.
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{empty} +
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The internal capacitors of the sample and hold circuit of the ADCs have to charge as fast as possible. In conclusion ADCs should be connected to a low impedance signal source.
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Due to the added impedance of the previous stage, the impedance has to be converted by an impedance converter or also called voltage follower. +
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Due to the added impedance of the previous stage, the impedance has to be converted by an impedance converter or also called voltage follower.
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{empty} +
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This can be done by using an op-amp and connecting the output of the op-amp directly to the negative input terminal. This leads to a very low impedance input for the connected ADC. |
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