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# How to convert V/#electron to V/V or V/I?

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#### melkord

##### Full Member level 2
I found that the gain is defined as [V/#electron]?
How can I convert this to V/V or V/I?

As I understand it, I need capacitance information to convert #electron to voltage using V = Q/C = (q x #electron)/C.

#### FvM

##### Super Moderator
Staff member
If you are asking about charge sensitive amplifier, the three gain numbers are not directly related. V/Q is set by a capacitance, V/I by a bias resistor. V/V is set by amplifier voltage gain.

#### melkord

##### Full Member level 2
If you are asking about charge sensitive amplifier, the three gain numbers are not directly related. V/Q is set by a capacitance, V/I by a bias resistor. V/V is set by amplifier voltage gain.
Yes, i am reading about the CSA used in electron counter applications.
V/#electron is commonly used.
But I am not sure how to simulate the circuit because the input is in voltage.
Any suggestion of referrence that I can see?

#### Dominik Przyborowski

CSAs are integrators. Your input is a charge, more precisily Dirac delta current pulse. Use ipulse source with 0 period, very short rise/fall time and amplitude set to desired charge/pulse area