초록 ▼

Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. An 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

Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. An 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. An amplifier circuit having a bandpass circuit in cascade with the forward loop gain is provided, with the bandpass circuit having a transfer function approximating one plus a bandpass characteristic, the passband of which corresponds to the information band. This arrangement increases the open-loop gain of the amplifier circuit around the information frequency without affecting the open-loop gain at DC and crossover so as to reduce phase and gain errors around the information frequency. A quadrature hulling system is provided for an in-plane micromechanical gyroscope. A signal having an in-phase component due to Coriolis induced out-of-plane motion and a quadrature component due to mechanical misalignments is mixed with a voltage in-phase with motor position. The mixer output is used to apply a DC potential to motor drive electrodes and is automatically adjusted by the integral compensator until the mixer output is zero, resulting in a nulled quadrature component.

대표청구항 ▼

An amplifier circuit comprising: a bandpass circuit having an input and an output and a transfer function approximating one plus a bandpass characteristic, wherein said output of said bandpass circuit provides an output terminal of said amplifier circuit; a first operational amplifier having an inpu

An amplifier circuit comprising: a bandpass circuit having an input and an output and a transfer function approximating one plus a bandpass characteristic, wherein said output of said bandpass circuit provides an output terminal of said amplifier circuit; a first operational amplifier having an input coupled to an input terminal of said amplifier circuit and an output coupled to said input of said bandpass circuit; and a global feedback network coupled around said first operational amplifier and said output terminal.