Patent ID: 7243542

Claim:
An apparatus for measuring the angular rotation of a moving body, the apparatus comprising: an upper sensor layer; a lower handle layer substantially parallel to said sensor layer; a capacitive pickoff structure for providing an output signal indicative of the angular rotation of the moving body, said pickoff structure including first and second air capacitive elements receiving first and second measurement signals from which said output signal is derived; a first accelerometer motor formed of said sensor layer, said first accelerometer motor including a first conductive path for providing said first measurement signal to said first capacitive element and a second conductive path for receiving a common motor voltage, said common motor voltage including noise; a second accelerometer motor formed of said sensor layer, said second accelerometer motor including a third conductive path for providing said second measurement signal to said second capacitive element and a fourth conductive path for receiving said common motor voltage; and an isolation structure for preventing substantial capacitive coupling of said first and third paths to any other element of said apparatus carrying said common motor voltage that would import the noise into said first and second measurement signals.