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US 7,603,892 B2Granted
Cam and crank sensor with current limiting open collector output for conducted emissions improvement
AssigneeHoneywell International Inc.
InventorsSteven D. Foster, Jason M. Chilcote, John A. Modica
Life of this patent
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Abstract
A sensor apparatus and method include a sensor configured on an integrated circuit, which includes a current limiting open collector output stage configured in association with the integrated circuit. The current limiting open collector output stage reduces a fall time and a di/dt associated with an output signal of the sensor and a ringing produced thereof in order to improve EMC and conducted emissions required of the sensor.
Claims13
A sensor enhancement system, comprising:
- a sensor configured on an integrated circuit;
- a current limiting open collector output stage configured in association with said integrated circuit, wherein said current limiting open collector output stage reduces a fall time and a di/dt associated with an output signal of said sensor and a ringing produced thereof in order to improve EMC and conducted emissions required of said sensor, wherein said current limiting open collector output stage comprises:
- a first transistor connected to a second transistor, wherein said first and second transistors are connected to a ground;
- and
- a resistor connected to said first and second transistor, wherein said output signal provided by said sensor is fed to a node coupled to said first transistor and said resistor, such that said output signal is output from said second transistor.
2 more elements
A sensor enhancement system, comprising:
- a rotary/angular sensor configured on an integrated circuit;
- a current limiting open collector output stage configured in association with said integrated circuit, wherein said current limiting open collector output stage reduces a fall time and a di/dt associated with an output signal of said rotary/angular sensor and a ringing produced thereof in order to improve EMC and conducted emissions required of said rotary/angular sensor, wherein said current limiting open collector stage comprises:
- a first transistor connected to a second transistor, wherein said first and second transistors are connected to a ground:
- a resistor connected to said first and second transistor, wherein said output signal provided by said sensor is fed to a node coupled to said first transistor and said resistor, such that said output signal is output from said second transistor.
1 more element
A method for enhancing a sensor, comprising:
- configuring a sensor on an integrated circuit;
- associating a current limiting open collector output stage with said integrated circuit, wherein said current limiting open collector output stage reduces a fall time and a di/dt associated with an output signal of said sensor and a ringing produced thereof in order to improve EMC and conducted emissions required of said sensor;
- and
- configuring said current limiting open collector output stage to comprise:
- a first transistor connected to a second transistor, wherein said first and second transistors are connected to a ground;
- and
- a resistor connected to said first and second transistor, wherein said output signal provided by said sensor is fed to a node coupled to said first transistor and said resistor, such that said output signal is output from said second transistor.
4 more elements
Dependencies are inferred from the claim text.