Abstract
An implanted physiological-signal telemetry unit for an ambulatory animal is described. It uses a single 1.35 V mercury cell, is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1 \times 2.5 \times 4</tex> cm in size, and weighs 15 g. Transcutaneous RF turn-on and magnetic turn-off are used to conserve battery power. The battery can operate 175 h before replacement. An integrated circuit amplifier supplies a voltage gain of 250 over a nominal band from 0.2 Hz to over 4 kHz. With 2 mV peak input, it yields 75 kHz peak deviation of a 20 MHz carrier. Relations between frequency, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> , receiving antenna voltage, and implant coil diameter are derived. Circuits are also given for a "turn-on" device, a 20 MHz converter, and the sequential gating of three mutually perpendicular antennas to avoid dropouts as the animal moves within the cage.
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