Differential charge amplifier with built-in testing for rotation rate sensor
First Claim
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1. A differential charge amplifier for a rotation rate sensor having a piezoelectric structure with first and second pick-ups that provide charge signals corresponding to rotation of the structure, comprising:
- a pair of input channels to which the charge signals are applied in a balanced differential manner, means for applying a test signal to the two input channels in an unbalanced manner so that the two channels produce different outputs in response to the test signal, and an output stage responsive to the difference between the outputs of the two input channels.
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Abstract
Differential charge amplifier for processing charge signals from a rotation rate sensor, with a test signal being applied to the differential charge amplifier so that during normal operation the output of the amplifier corresponds to the test signal as well as to the charge signals.
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Citations
10 Claims
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1. A differential charge amplifier for a rotation rate sensor having a piezoelectric structure with first and second pick-ups that provide charge signals corresponding to rotation of the structure, comprising:
- a pair of input channels to which the charge signals are applied in a balanced differential manner, means for applying a test signal to the two input channels in an unbalanced manner so that the two channels produce different outputs in response to the test signal, and an output stage responsive to the difference between the outputs of the two input channels.
- View Dependent Claims (2)
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3. In a differential charge amplifier for a rotation rate sensor having a piezoelectric structure with first and second pick-ups that provide charge signals corresponding to rotation of the structure:
- first and second charge amplifiers having first inputs to which the charge signals from respective ones of the pick-ups are applied and second inputs to which a reference is applied, means for applying a test signal to the second input of one of the charge amplifiers, and a difference amplifier responsive to output signals from the charge amplifiers.
- View Dependent Claims (4, 5)
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6. In a differential charge amplifier for a rotation rate sensor having a piezoelectric structure with first and second pick-ups that provide charge signals corresponding to rotation of the structure:
- a first charge amplifier having an inverting input to which the first pick-up is connected and a non-inverting input which is connected to a reference level, a second charge amplifier having an inverting input to which the second pick-up is connected and a non-inverting input, means for applying a test signal to the non-inverting input of the second charge amplifier, and a difference amplifier having an inverting input to which the output of the first charge amplifier is connected and a non-inverting input to which the output of the second charge amplifier is connected.
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7. In a differential charge amplifier for a rotation rate sensor having a piezoelectric structure with first and second pick-ups that provide charge signals corresponding to rotation of the structure:
- a first charge amplifier having an inverting input to which the first pick-up is connected and a non-inverting input, means for applying a test signal to the non-inverting input of the first charge amplifier, a second charge amplifier having an inverting input to which the second pick-up is connected and a non-inverting input which is connected to a reference level, and a difference amplifier having an inverting input to which the output of the first charge amplifier is connected and a non-inverting input to which the output of the second charge amplifier is connected.
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8. A circuit for processing charge signals from pick-ups on a piezoelectric structure in a rotation rate sensor, comprising:
- a differential charge amplifier for providing an output signal corresponding to the charge signals from the pick-ups, and means for applying a test signal to the differential charge amplifier so that during normal operation the output signal corresponds to the test signal as well as to the charge signals.
- View Dependent Claims (9)
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10. A differential charge amplifier for processing charge signals from a rotation rate sensor, with means for applying a test signal to the differential charge amplifier so that during normal operation the output of the amplifier corresponds to the test signal as well as to the charge signals.
Specification