Charge amplifiers that can be implemented in thin film and are useful for imaging systems such as digital breast tomosynthesis with reduced X-ray exposure
An apparatus (e.g., an imaging system) includes a circuit, including: a p-i-n diode having a cathode coupled to a cathode bias voltage or ground； a charge transistor having a first source/drain terminal coupled to an anode of the diode； a storage capacitor having a first terminal coupled to a second source/drain terminal of the charge transistor and a second terminal coupled to the cathode； an amplification transistor having a gate terminal coupled to the first terminal of the storage capacitor and a first source/drain terminal coupled to a reference voltage； a read transistor having a first source/drain terminal coupled to a second source/drain terminal of the amplification transistor； a data line having a first terminal coupled to a second source/drain terminal of the read transistor； and a readout circuit coupled to a second terminal of the data line, providing an output voltage corresponding to charge on the storage capacitor.
