Hi,
I need to measure the configuration current of a CPLD, the datasheet says it should be roughly 7mA over period of 150us.
I am thinking of making an opamp current-voltage converter (transimpedance amp), what would be the GBW product needed to pull this off? I am planning to measure the output with an oscilloscope, so 10mA=2V would probably be ideal, so this if I want it to react in 1us this gives me slew rate of 2V/us which doesn´t seem too demanding.
This gives conversion ratio will need Rf of 200Ω, how would I calculate the bandwidth of this circuit?
The fastest opamp that I have readily available is the TLE2142 wih 27v/us and 5.9Mhz GBW, which seems it should be ok.
I need to measure the configuration current of a CPLD, the datasheet says it should be roughly 7mA over period of 150us.
I am thinking of making an opamp current-voltage converter (transimpedance amp), what would be the GBW product needed to pull this off? I am planning to measure the output with an oscilloscope, so 10mA=2V would probably be ideal, so this if I want it to react in 1us this gives me slew rate of 2V/us which doesn´t seem too demanding.
This gives conversion ratio will need Rf of 200Ω, how would I calculate the bandwidth of this circuit?
The fastest opamp that I have readily available is the TLE2142 wih 27v/us and 5.9Mhz GBW, which seems it should be ok.