—A performance evaluation of a level-crossing analog-to-digital converter (ADC) is presented. It is shown that its signal-to-noise ratio (SNR) does not depend on the input-signal amplitude, which results in an almost-flat SNR for amplitudes that fall into the Nyquist criteria for irregular sampling. The influence of the reconstruction procedure on SNR is… (More)
—We have designed, fabricated and tested an XY-addressable readout architecture for superconducting flux qubits in an integrated circuit designed to enable adiabatic quantum optimization algorithms. The readout architecture for an N-qubit system comprises N hysteretic dc SQUIDs and N rf SQUID latches controlled with 2 √ N +2 wires. The latching elements are… (More)
– The use of PSpice models for piezoe-lectric devices and ultrasonic transmission media is of major importance when designing electronics for ultrasonic systems. Today, these models include vis-coelastic loss but disregard loss due to diffraction, i.e. beam spreading. This paper presents a method for the inclusion of diffraction loss in PSpice simulations… (More)
— We have designed, fabricated and operated a scal-able system for applying independently programmable time-independent, and limited time-dependent flux biases to control superconducting devices in an integrated circuit. Here we report on the operation of a system designed to supply 64 flux biases to devices in a circuit designed to be a unit cell for a… (More)
2 2 1 1 s s t t I I n n t t e e r r n n a a t t i i o o n n a a l l T T e e c c h h n n i i c c a Some format issues inherent in the e-media version may also appear in this print version.
The design of a 450nW bandgap temperature sensor in the 0 to 175°C range is presented. The design demonstrates a leakage current compensation technique that is useful for low-power designs where transistor performance is limited. The technique mitigates the effects of leakage in Brokaw bandgap references by limiting the amount of excess current that… (More)
Equivalent circuits for piezoelectric devices and ultrasonic transmission media can be used to cosimulate electronics and ultrasound parts in simulators originally intended for electronics. To achieve efficient system-level optimization, it is important to simulate correct, absolute amplitude of the ultrasound signal in the system, as this determines the… (More)
—A concept for doing accurate monitoring of temperature in power semiconductor modules is proposed. The concept involves glueing wireless single-chip temperature sensors with on-chip coils in direct contact with power semiconductor devices within their modules. Direct contact results in accurate temperature measurements while wireless technology such as… (More)