Sensor readout circuit
AssigneeThe Charles Stark Draper Laboratory, Inc.
InventorsAnthony Petrovich, John R. Williams, Christopher E. Dube
Life of this patent
Estimating the term…
Abstract
A sensor readout circuit which provides a frequency signal output including a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal, and a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal.
Claims32
A sensor readout circuit which provides a frequency signal output, the readout circuit comprising:
- a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal;
- and
- a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal.
A sensor readout circuit which provides a frequency signal output, the readout circuit comprising:
- a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal;
- a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal;
- and
- a phase delay adjustment circuit responsive to the input signal and the phase detection circuit for adjusting the phase difference.
A sensor readout circuit which provides a frequency signal output, the readout circuit comprising:
- a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal;
- and
- a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal;
- and
- a voltage step module configured to offset the voltage by a predetermined amount to offset the frequency and measure the corresponding phase detector circuit output change.
A sensor readout circuit which provides a frequency signal output, the readout circuit comprising:
- a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output signal;
- a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal;
- a phase delay adjustment circuit responsive to the input signal and the phase detection circuit for adjusting the phase difference;
- and
- a voltage step module configured to offset the voltage by a predetermined amount to offset the frequency and measure the corresponding phase detector circuit output change.
A sensor readout circuit which provides a frequency signal output, the readout circuit comprising:
- a phase detector circuit responsive to an output signal from a flexure plate wave device and an input signal to the flexure plate wave device and configured to detect the phase difference between the input signal and the output signal;
- and
- a drive circuit responsive to the phase detector circuit and configured to maintain a fixed phase difference between the input signal and the output signal.
A method for determining the frequency signal output of a sensor, the method comprising the steps of:
- detecting the phase difference between an output signal from a sensor and an input signal to a sensor;
- and
- maintaining a fixed phase difference between the input signal and the output signal.
A method for determining the frequency signal output of a sensor, the method comprising:
- detecting the phase difference between an output signal from a sensor and an input signal to a sensor;
- maintaining a fixed phase difference between the input signal and the output signal;
- and
- adjusting the phase difference between the input signal and the output signal to a predetermined fixed phase difference.
Dependencies are inferred from the claim text.