Abstract: The device for the in vivo measurement of pressures and pressure variations in or on the human or animal body, more particularly inside or outside bones, is composed of an implantable probe (1) and of an evaluating unit (3), the probe (1) comprising an oscillating circuit (L-C) including a capacitor in the form of a pressure sensor (8, 30) and a coil (13), and the evaluating unit (3) comprising a resonance oscillating circuit capable of detecting the natural frequency (Fe) of the oscillating circuit, is variable according to variations of a dimension of the capacitor caused by pressure variations. The pressure sensor (8) is spatially separated from the coil (13) and connected to the latter by an electric conductor (15). On one hand, this allows small dimensions of the implantable pressure sensor, and on the other hand, a clear signal transmitted over a relatively long distance.

Abstract: A voltage generator for producing an internal supply voltage has a standby voltage generator and a voltage generator for normal operation that are controlled in common by a reference voltage. In addition, a comparator stage is provided whose switching threshold is set lower than the reference voltage by using a voltage divider that is connected to the reference voltage. The additional comparator stage thus activates the voltage generator for normal operation when the internally produced voltage falls below its switching threshold so that the internal supply voltage is stabilized.

Abstract: A voltage generator for producing an internal supply voltage has a standby voltage generator and a voltage generator for normal operation that are controlled in common by a reference voltage. In addition, a comparator stage is provided whose switching threshold is set lower than the reference voltage by using a voltage divider that is connected to the reference voltage. The additional comparator stage thus activates the voltage generator for normal operation when the internally produced voltage falls below its switching threshold so that the internal supply voltage is stabilized.