| 摘要 |
<p>Problems with source followers employed in active arrays are alleviated by employing a differential amplifier for each element of the active array. However, instead of including an entire differential amplifier within each element, part of the differential amplifier structure is shared among each sensor element connected to a particular column. For example, the differential amplifier may be a differential pair operational transconductance amplifier (OTA) which is connected using a feedback configuration. However, instead of including an OTA within each sensor element of the array, part of the OTA structure is shared among each sensor element connected to a particular column. Although gains greater than one are achievable by employing the differential amplifier with a feedback network, to avoid introducing fixed pattern noise, substantially unity gain is often preferred. Furthermore, the shared differential amplifier model of array reading may be employed for any active array readout application, e.g., including arrays that are not in themselves per se sensor arrays, where the necessary structure to form the shared differential amplifier is included within the elements of the array. <IMAGE></p> |
