Photo-Diode Current-to-Voltage Converters
This entry was posted on Tuesday, November 24th, 2009 at 7:54 am and is filed under AC/DC Converter. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.
Tags: Current-to-Voltage Converter
Here are some ways to use high-speed Current Feedback and Voltage Feedback op amps to do the job.It’s more difficult to design a good current-to-voltage converter using a Voltage Feedback Amplifier (VFA). As discussed above, phase shift caused by photo-diode capacitance is often a source of instability. Furthermore, wide bandwidth usually comes at the expense of supply currents and higher supply voltage. However, the new LMH6642 high-speed low-voltage VFA op amp has excellent performance
in a transimpedance gain block.This device can operate down to 2.7V single supply and its ?3dB BW (AV = +1) is more than 100MHz (with a supply current of only 2.7mA)
Source: http://www.national.com/an/AN/AN-1244.pdf
