Low-noise readout circuits with a response time acceleration technique for high output impedance sensors

In this paper, a low-noise high-gain read-out circuit with a response time acceleration technique for high output impedance sensors is presented. In the readout circuits using a switched capacitor amplifier, the thermal noise can be greatly reduced if a reset noise component sampled at the charge summing node is canceled. Due to high output impedance of sensors the response time is large to achieve the low noise requirement. A new technique for response time acceleration is presented making the circuit response time faster white keeping the noise level unaffected.