Some remarks are made on how to determine by magneto-optical imaging the electric currents flowing in a superconductor. The inversion problem is discussed how to compute these currents from the magnetic field measured in a planar magneto-optical indicator film positioned close to the conductor. Next, some geometries are listed for which the currents and magnetic fields can be computed from firs...

We propose a deenition of \regular synthesis," more general than those suggested by other authors such as Boltyanskii and Brunovsk y, and an even more general notion of \regular presynthesis." We give a complete proof of the corresponding suuciency theorem, a slightly weaker version of which had been stated in an earlier article, with only a rough outline of the proof. We illustrate the strengt...

A current mode sample and hold circuit has been designed to examine if high-precision current processing is possible simultaneously with a circu it to which current mode and switched-current circuits are applied and which operates at high-speed and with low supply voltage. The results are 1 O-bit accuracy, a 20MHz clock, and a 2 V supply voltage. Clock feedthroug h which degrades the precision ...