초록 ▼

Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. The electronics includes an off-frequency drive scheme for reducing in-band drive signal coupling to the output signal and techniques for reducing errors in the sensor output signal due to quadrature a

Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. The electronics includes an off-frequency drive scheme for reducing in-band drive signal coupling to the output signal and techniques for reducing errors in the sensor output signal due to quadrature and phase shift. The off-frequency drive scheme includes a frequency translation circuit in the excitation feedback loop of a sensor system to suppress components of the sensor drive signal at a predetermined frequency so that coupling of the drive signal to the sensor output signal can be readily removed by conventional filtering techniques. The sensor system includes a nonlinear input transducer for converting the drive signal to a force signal such that the force signal has a component at the predetermined frequency while the drive signal does not. A tuned circuit amplifies and filters the frequency shifted output signal of the translation circuit to provide the drive signal. Also provided is a sense bias generator including a tuned circuit for amplifying the available bias supply voltage to enhance sensitivity.

대표청구항 ▼

A sensor system comprising: an input transducer receiving a drive signal and converting said drive signal into a force signal having a non-linear relationship with respect to said drive signal; a sensor responsive to said force signal and an external stimulus for providing a first sensor output sign

A sensor system comprising: an input transducer receiving a drive signal and converting said drive signal into a force signal having a non-linear relationship with respect to said drive signal; a sensor responsive to said force signal and an external stimulus for providing a first sensor output signal having a predetermined frequency and being indicative of said force signal and a second sensor output signal having said predetermined frequency and being indicative of said external stimulus; a frequency translation circuit responsive to said first sensor output signal for suppressing a component of said first sensor output signal at said predetermined frequency to provide a frequency translated signal capable of producing a force at said predetermined frequency; and a tuned circuit responsive to said frequency translated signal for generating said drive signal, wherein said tuned circuit comprises an inductor and a capacitor for amplifying said frequency translated signal, so as to increase the amplitude of said drive signal.