A simple charge sensitive preamplifiers for experiments with a small number of detector channels

We present a Charge Sensitive Preamplifiers, CSP, based on a very simple design. The CSP consists of an input transistor and a Differential Amplifier, DA, in the second stage. The circuit does not make use of a cascode connection to load the input transistor, to minimize the supply voltage, with a consequent reduction of power dissipation. In addition, only two active devices, a transistor and an Operational Amplifier, are needed where discrete components are used. By exploiting both the inputs of the DA and thanks to a simple resistive network used to load the input transistor, stability, noise and dynamic performances can be met applying a few very simple mathematical rules.