University of Michigan

Xin Zan

Al-Thaddeus Avestruz

A field cancellation device includes a primary coil and a cancellation coil. The primary coil surrounds a primary volume. The cancellation coil is disposed at least in part within the primary volume. Upon simultaneous incidence of an input signal on both coils, the primary coil and the cancellation coil each generate a response to the signal input. The cancellation field associated with the response from the cancellation coil may cancel a portion of the field power in a protected volume, which is the part of the primary volume surrounded by the cancellation coil. The field cancellation device further includes a balancing inductor that controls the balance between the responses generated by the respective coils.

Field cancellation for coil-surrounded circuitry

A pulse shaping device includes an inductor that is selectively output-coupled to a first port of a capacitor. The inductor is charged to a selected current throughput and then coupled to the first port to generate a first characteristic within the current flowing at a second port of the capacitor. The capacitor is charged until reaching a clamping voltage at the first port. A voltage clamp of the shaping device clamps the first port of the capacitor at the clamping voltage to generate a second characteristic within the current flowing at a second port of the capacitor.

Pulse generator

A device for driving a control terminal of a transistor includes an input terminal, a transformer including an input winding and an output winding, the input winding being coupled to the input terminal, an n-stage buffer circuit configured to generate a drive signal for the control terminal of the transistor, the n-stage buffer circuit being coupled to a first end of the output winding, and a positive feedback path coupled to an output of a stage of the n-stage buffer circuit to provide a DC offset to an input of the n-stage buffer circuit.

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Ann Arbor, MI, United States of America

Xin Zan