As MRI array counts expand, there is growing interest in moving more of the receive electronics onto the array, the ultimate goal being wearable, and cordless arrays. This places severe constraints on the maximum feasible power consumption per channel. We explore low power front-end topologies employing passive mixers. If combined with low-power high resolution successive approximation ADCs or continuous time sigma delta ADCs, receive arrays at only 100mW per channel may be feasible.
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