An Integrated Negative Resistance Current Amplifier to Enhance the Sensitivity of a Weakly Coupled Local Detector

A localized detection coil with an integrated negative resistance amplifier has been constructed to enhance the local sensitivity of inductively coupled receive coils. When the transistor is grounded on its drain, the feedback effect transforms capacitive impedance on the source into negative resistance on the gate, thus increasing the signal current in the LC resonator. Although the integrated amplifier consumes only 86 μW of power, 14 dB gain is achievable with excellent noise performance. Such a detection scheme enables high resolution animal imaging at 3T with small active coils inductively coupled to larger clinical coils using the standard signal interface.

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