Other Parts Discussed in Thread: THS4303
I am wondering if my THS4303 EVM is potentially defective. My set up is described below:
- I have a simple power supply circuit giving (according to a voltmeter) +1.8 V and -1.8 V relative to ground that I am trying to use to power this device. These voltage measurements were taken on the three banana plug-terminated wires I am plugging in directly to the board, so I know my power supply circuit is working. (The +/- 1.8 V should be sufficient, as the manual indicates the minimum supply voltage should be 3 V and I have ~3.6 V).
- Naturally, I have the +1.8 V lead plugged into the "VS+" connection on the board, the -1.8 V lead plugged into the "VS-" connection on the board, and the 0 V lead plugged into the ground connection of the board.
- I have confirmed that my input signal for amplification (the pulse train output from a femto-second laser) is visible on an oscilloscope, so I know the relevant components on the front end are working. Yet when I connect the input signal to the board, turn on the power supply, and connect the board output to the oscilloscope (i.e., set everything up to actually amplify this signal!) I see nothing on the oscilloscope. Just a noisy baseline no different than when the power supply to the amplifier is not even turned on.
Am I missing something very basic to properly power this device? Is it potentially defective? I can elaborate and/ or upload photos if needed.
Thank you!
