论文信息 - A simple SQUID system with one operational amplifier as readout electronics

A simple SQUID system with one operational amplifier as readout electronics

We describe a dc Superconducting Quantum Interference Device (SQUID) readout electronics in Flux Locked Loop (FLL) mode without integrator and with only one operational amplifier, which is called Single Chip Readout Electronics (SCRE). A weakly damped niobium-SQUID magnetometer with a large flux-to-voltage transfer coefficient of about ∂V/∂Φ ≈ 380 μV/Φ0 and SCRE results in a very simple SQUID system. We characterize the system and demonstrate its applicability to Magnetocardiography (MCG) and measurements using the Transient ElectroMagnetic (TEM) method. SCRE not only simplifies the readout scheme, but also improves the system stability, the bandwidth and the slew rate. The difference between SCRE and a conventional readout scheme (preamplifier + amplifier + integrator) is also discussed.

[1] M. Jiang,et al. An insight into voltage-biased superconducting quantum interference devices , 2012 .

[2] H. Meyer,et al. Planar SQUID magnetometer integrated with bootstrap circuitry under different bias modes , 2012 .

[3] C. M. Natarajan,et al. Superconducting nanowire single-photon detectors: physics and applications , 2012, 1204.5560.

[4] M. Jiang,et al. A voltage biased superconducting quantum interference device bootstrap circuit , 2010 .

[5] D. G. Nichols,et al. Linearity of high‐Tc dc superconducting quantum interference device operated in a flux‐locked loop , 1996 .

[6] D. Drung,et al. A 5‐MHz bandwidth SQUID magnetometer with additional positive feedback , 1995 .

[7] Dietmar Drung,et al. Low‐noise high‐speed dc superconducting quantum interference device magnetometer with simplified feedback electronics , 1990 .

[8] A. Warnick,et al. Digital‐Analog Magnetometer Utilizing Superconducting Sensor , 1967 .