Multiplexing of a bandpass filter circuit to work with a flux-gate sensor output
First Claim
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1. A multiplexed control circuit for an electronic compass including a microcomputer, a flux-gate, a flux-gate driver, a bandpass filter, a synchronous detector, an integrator, a summing amplifier, and a ranging circuit the multiplexed control circuit comprising:
- a gate switch connected at its input to the flux-gate for each magnetic component to be measured;
a switching network, controlled by the microcomputer;
the gate switches commonly connected at their outputs to the serial connection of the bandpass filter, synchronous detector, integrator and summing amplifier;
the microcomputer sending signals to the switching network such that the gate switches for each magnetic component are controlled, alternately conducting, thereby alternately allowing the output of the flux-gate to pass through to the serial connection of the bandpass filter, synchronous detector, integrator and summing amplifier whereby the effects of gain and component tolerances on the control circuit is minimized.
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Abstract
Multiplexing a bandpass filter circuit to work with a flux-gate sensor output to minimize the amount of electronic circuitry required to work with the control system and to reduce the effect of gain on the circuit by emphasizing repeatability.
26 Citations
1 Claim
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1. A multiplexed control circuit for an electronic compass including a microcomputer, a flux-gate, a flux-gate driver, a bandpass filter, a synchronous detector, an integrator, a summing amplifier, and a ranging circuit the multiplexed control circuit comprising:
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a gate switch connected at its input to the flux-gate for each magnetic component to be measured; a switching network, controlled by the microcomputer; the gate switches commonly connected at their outputs to the serial connection of the bandpass filter, synchronous detector, integrator and summing amplifier; the microcomputer sending signals to the switching network such that the gate switches for each magnetic component are controlled, alternately conducting, thereby alternately allowing the output of the flux-gate to pass through to the serial connection of the bandpass filter, synchronous detector, integrator and summing amplifier whereby the effects of gain and component tolerances on the control circuit is minimized.
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Specification
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Current AssigneeChrysler Corporation (Stellantis NV)
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Original AssigneeChrysler Corporation (Stellantis NV)
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InventorsHormel, Ronald F.
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Primary Examiner(s)Little, Willis
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Application NumberUS06/814,125Time in Patent Office557 DaysField of Search33/361, 33/356, 33/357, 33/363 QUS Class Current33/361CPC Class CodesG01C 17/30 Earth-inductor compassesG01R 33/04 using the flux-gate principle
