Closed-loop device calibration using wideband signals
A broadband and equipment technology, applied in the field of feedback information, which can solve the problems of affecting measurement, sensitivity changes, and it is not easy to eliminate interference.
Active Publication Date: 2021-06-18
TEXAS INSTR INC
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Problems solved by technology
[0006] A known problem with conventional closed-loop calibration of Hall Effect sensors is that the calibration current near the Hall Effect sensor can generate enough heat to change the operating temperature, causing a change in sensitivity and affecting the primary measurement
Furthermore, closed-loop calibration has been shown to perform well without an external magnetic field, but fully removing the interference in practice is not straightforward and requires offline calibration in a magnetically shielded environment
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[0015] Referring now to the attached drawings, specifically figure 1 , which shows a simplified closed-loop calibration circuitry example 140 . In this configuration, a signal generator device 141 provides a pseudo-random broadband calibration signal 142 in which a nearly random sequence of bits (eg, ones and zeros) is spread over a wide range of frequencies. The receiver circuitry 143 then receives the calibration signal 142 and outputs the calibration signal 142 depending at least on said broadband calibration signal 142, any input signal 130 that the device is expected to measure, and other possible perturbing effects that change the response / characteristics of the receiver 143 (such as temperature effect)144. Processing circuit 146 receives output signal 144 and desired response signal 147 . In this way, the processing circuitry 146 can determine what compensation signal 148 should then be applied back to the receiver circuitry 143 . Compensation signal 148 affects adju...
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The present application relates to closed-loop device calibration using broadband signals, and the present application discloses a closed-loop calibration scheme configured to allow a device (140, 240) to remain in continuous operation. A signal generator device (141, 240) provides a pseudo-random sequence for a signal (142, 242) received by a magnetic field sensor (143, 243) of a magnetic field, such as a Hall effect sensor. A signal decoder circuit (250) receives the output signal (144, 244) and decodes the resulting spread spectrum signal from interference by measuring the gain in the overall signal. The decoder device (250) distinguishes known spread spectrum signals from perturbing effects of any specific bandwidth. The processing circuit (246) then outputs a signal with the operating parameters that have been tuned to compensate for the effects of the disturbance. Processing circuitry (246) provides receiver circuitry (243) to compensate the signal, thereby forming a closed loop calibration configuration.
Description
[0001] related application [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 273033, filed December 30, 2015, the contents of which are incorporated by reference as if rewritten herein. technical field [0003] The present invention relates generally to the calibration of devices, and in particular to obtaining feedback information for the operation of devices, such as closed-loop calibration of Hall effect sensors, by using signals applied to the devices. Background technique [0004] Open-loop and closed-loop calibration methods are well known and applied in various contexts. One such context is in the calibration of Hall effect magnetic field sensors. Hall effect magnetic field sensors are solid state magnetic sensor devices that can be used to measure magnetic fields. Applications of Hall effect magnetic field sensors require high accuracy; however, they are known to suffer from sensitivity variations and drift with process variat...
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IPC IPC(8): G01R33/00
CPCG01R33/0035G01R35/005G01N1/00G01N2201/00G01R33/07H04J1/00
Inventor A·波利R·M·罗森奎斯特T·L·斯卡利
Owner TEXAS INSTR INC