Patent ID: 11940336
Assignee: SPORIAN MICROSYSTEMS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. Capacitive pressure transducer apparatus for transducing pressures to electric signals, comprising:
two electrodes positioned adjacent to each other with a gap between them, at least one of the two electrodes being movable toward and away from the other of the electrodes in response to pressure changes;
a spacer positioned between portions of the two electrodes to maintain the gap between the two electrodes, the spacer comprising an electrically conductive shield layer sandwiched between a first electrically insulative layer and a second electrically insulative layer;
a sensor voltage connected to one of the two electrodes;
a shield voltage connected to the electrically conductive shield layer, wherein the shield voltage is essentially equal in magnitude to the sensor voltage at all points in time; and
an electrically conductive shield box covering, but not in electrical connection with, the two electrodes, wherein the shield voltage is connected, to the electrically conductive shield box.