Does Analog Devices got an Op Amp which got: 60V output voltage within 30-50 MHz with a very low current?
The only Opamp that can go up to 100 V in our portfolio is the ADA4700. But its bandwidth is limited around 3.5 MHz only. What applications are you going into?
I'm after a solution to get a control voltage (very low current) that changes with time very fast (30-50 MHz bandwidth)
With your required output voltage and bandwidth, I think it is impossible to get an amplifier that can handle your requirements. Aside from we only have single part that can go up to 100 V output voltage, computing the minimum Slew rate required by your system using the formula below makes very difficult to get any parts that can handle this.
SR = 2*pi*Fmax*Vpeak
With BW = 30 MHz and Vp = 60 V, the SR you need is around 11300 V/us.
Are you saying that even designing an 30-50 MHz BW amplifier won't work for that application?
Can you think of any other solution for the application below:
I'm after a solution with the details below:
- Input signal: 30-50MHz BW - 0V to 0.25V
- Output signal: 30-50MHz BW - 30V -92V (current < 30 mA)
- Available power supply: 30V and 90V
What is your load? How much capacitance?
It is high impedance load and capacitance of the order of pF.
"...of the order of pF...." 2 pF?? 10 pF?? 50 pF??
Makes a big difference. It takes a lot of current to charge and discharge a capacitance
at the slew rates you want. Find out how many pF it really is and calculate how much
current you need.
the current is limited to 3 mA or so
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