Development of integrated digital squid with digital signalprocessing circuits

Nowadays, sensitive magnetometers are used in wide application areas. SQUID, Superconducting Quantum Interference Device, is one of the most sensitive superconducting sensors, which is known for its sensitive magnetic flux-voltage characteristic. SQUIDs, which can be used as sensors or amplifiers, have a wide range of uses. Some of those are earthquake detection, medicated magnetoencephalography and magnetocardiography, solid-state physics, biomagnetism, and archeology. There are two types of SQUIDs, called RF SQUID and DC SQUID. Magnetic field sensitivity of RF/DC SQUIDs made of low-temperature superconductors is in the fT/√Hz range. Although RF and DC SQUIDs are simple sensors and have relatively high sensitivity, they require complex readout circuits operating at room temperature. This situation both increases the cost and seriously affects the speed of processing of the data.Within the scope of this thesis; it is aimed to design an integrated system including a Digital SQUID and readout circuits on the same chip, which limits DC SQUIDs in terms of cost and speed, and also eliminates complex readout circuits operating at room temperature. In this way, it is desired to increase the sampling frequency of Digital SQUID and to eliminate the need for complex readout circuits operating at room temperature, thanks to digital signal processing circuits with different features (high speed, high sensitivity) on the same chip. Keywords: Superconductors, Single flux quantum circuits, Magnetic field sensors, SQUID, Digital signal processing circuits