DIY Charge sensitive Amplifier
Posted: Sun May 19, 2019 4:25 pm
Hello!
Since my HP 5554A died I was in need of a proper charge sensitive amplifier for my detectors.
They're not often on ebay, and if they are it's $100+...
So I designed my own:
The Operational amplifier is the heart of my design, that's why I choose a very fast one, with very low input current.
The LTC-6269-10 is a dual opamp with 4 GHz and 3 fA input bias current, which makes it a perfect choice, only the supply and therefore output voltage range is somewhat low, limiting the amplifiers dynamic range.
The amplifier settings result in 300, 870, 1460 and 2560 mV/pC.
It works well with Semiconductor Detectors (tested with several Ion implanted Si detectors) and proportional detectors (tested with several helium-3 detectors), but I did not yet measure noise figures.
This is the output pulse with 2 pC input: this is the output pulse with 100 fC input: The Amplifier has to be well shielded and the input has to be very low capacitance, otherwhise you'll get tonnes of noise and or no signal. If you have any questions feel free to ask
Lukas
Since my HP 5554A died I was in need of a proper charge sensitive amplifier for my detectors.
They're not often on ebay, and if they are it's $100+...
So I designed my own:
The Operational amplifier is the heart of my design, that's why I choose a very fast one, with very low input current.
The LTC-6269-10 is a dual opamp with 4 GHz and 3 fA input bias current, which makes it a perfect choice, only the supply and therefore output voltage range is somewhat low, limiting the amplifiers dynamic range.
The amplifier settings result in 300, 870, 1460 and 2560 mV/pC.
It works well with Semiconductor Detectors (tested with several Ion implanted Si detectors) and proportional detectors (tested with several helium-3 detectors), but I did not yet measure noise figures.
This is the output pulse with 2 pC input: this is the output pulse with 100 fC input: The Amplifier has to be well shielded and the input has to be very low capacitance, otherwhise you'll get tonnes of noise and or no signal. If you have any questions feel free to ask
Lukas