Electronics > Projects, Designs, and Technical Stuff

How can I build a class AB voltage amplifier?

<< < (3/3)

Siwastaja:

--- Quote from: Ben321 on February 11, 2019, 10:19:59 pm ---so assuming that an ADC has a high input impedance is a good assumption. Right?

--- End quote ---

No. A completely wrong assumption. Depending on case, ADCs sometimes require even less than 50 ohm drive impedance, and very often less than around 200 ohms. The assumption of high impedance is a classical trap for the young players.

For low frequencies and low sample rates, you can supply it using a small capacitor (like a 100nF ceramic), since the average consumption is low, and low impedance is only needed for short peaks (while sampling).

For higher sample rates, you typically use an opamp, which does both voltage and current amplification, and yes, gain bandwidth products go up to hundreds of megahertz if needed.

MiDi:
For SAR ADCs Analog Devices has a series of videos how to drive them.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod