Patent ID: 8938307
Filing Date: 2015-01-20
Classification: A61B,A61N,H04B

Abstract:
1. An implantable system, comprising: an ultrasonic receiver circuit coupleable to an ultrasonic transducer, the ultrasonic receiver circuit configured to obtain from the ultrasonic transducer a first electrical signal representative of an ultrasonic communication signal transduced by the ultrasonic transducer, the ultrasonic receiver circuit comprising: a local oscillator circuit; a mixer circuit coupled to the local oscillator circuit, the mixer circuit configured to provide a second electrical signal representative of the ultrasonic communication signal using the first electrical signal and the local oscillator circuit; a pre-amplifier circuit coupled to the mixer circuit, the pre-amplifier circuit including at least one field-effect transistor (FET) configured to operate in a weak inversion mode; and an analog-to-digital converter circuit coupled to the mixer and configured to provide a digital representation of the second electrical signal.