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Bandwidth vs Coupling Bandwidth vs Coupling 10 7 10 7 Type II (nom. 50 µA/Φ 0 ) 50 µV/Φ 0 75 100 150 10 6 Frequency (Hz) Frequency (Hz) Type I (nom. 5 µA/Φ 0) 10 5 10 4 10 3 0 5 10 15 20 10 6 10 5 10 4 10 3 25 Sensor Feedback Coupling (µA/Φ 0) 50 µV/Φ 0 75 100 150 0 10 20 30 40 50 60 70 80 90 100 Sensor Feedback Coupling (µA/Φ 0 ) Figure 5.5 The -3dB cut-off frequency as a function of sensor feedback coupling for SQUID Types I and II and several values of the transfer function ∂V/∂Φ. STAR Cryoelectronics 59