On 2/10/06, Madhu Annapragada wrote: > I was wondering if anyone on the list had experience with off-the-shelf > amplifiers in the 2GHz range. I have a current signal in the nano-ampere > range with a rise time of about 3ns and a pulse width of 9ns that I need to > convert to a voltage using a transimpedance amplifier with a gain of 10; the > signal is coming in via a 50 Ohm coax cable so my voltage output would be in > the order of 1nA x 50_Ohm x 10. It will eventually go to a 1.5Gsps flash ADC > but I need the voltage out without loosing the shape of the current > waveform. Any pointers to amplifiers used in the past would be greatly > appreciated. I'm not very sure you need a GHz amplifier. If you're checking a few dozens of datasheets, youll see a curious thing: there are large band amplifiers with low slew rate and low frequency band amplifier with very high slew rate. This could be a little dizzy. If you want to check my affirmation take a deep look on the Maxim site on the high frequency amplifiers. On the other hand, the GHz range amplifiers, are designed usually for a 50 ohm impedance match on both input and output, and this will be nasty your nanoampere current. I'll sugeest you to search a high slew rate amplifier (and there are up to 13kV/uS) with large input impedance. best regards, Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist