| ??? 04/20/10 14:17 Read: times |
#175178 - Buffers... Responding to: ???'s previous message |
Manju said:
A buffer is used to transfer a voltage from a first circuit, having a high output impedance level, to a second circuit with a low input impedance level. For my application first circuit is an opamp based differential amplifier which has high input impedance and low output impedance. The second stage is an opamp based butterworth low pass filter which also has high input impedance and low output impedance. Then what would be the role of a buffer here? Each OPamp works as a buffer here. There's no need for an extra buffer usually. Forget this delay matching gibberish. This hasn't anything to do with your application, I think. A buffer needn't to have unity gain. It can have any gain. A buffer is just an additional stage, that can do things the rest circuitry cannot. For instance, you can add a buffer to provide high output current capability, or low output impedance or high cable drive capability or fast settling time, when feeding an ADC, or or or. Mostly, an additional buffer isn't needed, because the original OPamp circuitry can serve as buffer. Kai Klaas |
