Testing circuit for a data interface
First Claim
1. A testing circuit adapted for an interface, the testing circuit comprising:
- a load feeding circuit comprising a resistance-regulating unit, a first comparator, a pass element, and a capacitor, the resistance-regulating unit connected to a positive input of the first comparator, a negative input of the first comparator connected to the capacitor and a first terminal of the pass element, an output of the first comparator connected to a second terminal of the pass element, a third terminal of the pass element connected to the interface, a load applied to the interface being regulated by changing a resistance value of the resistance-regulating unit; and
a voltage testing circuit comprising a second comparator and a display member connected to an output of the second comparator, the voltage of the interface being input to one input of the second comparator to compare with a reference voltage, the second comparator outputting a signal to control the display member to display a comparison result.
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Accused Products
Abstract
A testing circuit for an interface includes a load feeding circuit and a voltage testing circuit. The load feeding circuit includes a resistance-regulating unit, a first comparator, a pass element, and a capacitor. The resistance-regulating unit is connected to a positive input of the first comparator. A negative input of the first comparator is connected to the capacitor and a first terminal of the pass element. An output of the first comparator is connected to a second terminal of the pass element. A third terminal of the pass element is connected to the interface. The voltage testing circuit includes a second comparator and a display member connected to the second comparator. The voltage of the interface and a reference voltage are input to inputs of the second comparator, and the second comparator outputs a signal to control the display member to display a comparison result.
10 Citations
13 Claims
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1. A testing circuit adapted for an interface, the testing circuit comprising:
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a load feeding circuit comprising a resistance-regulating unit, a first comparator, a pass element, and a capacitor, the resistance-regulating unit connected to a positive input of the first comparator, a negative input of the first comparator connected to the capacitor and a first terminal of the pass element, an output of the first comparator connected to a second terminal of the pass element, a third terminal of the pass element connected to the interface, a load applied to the interface being regulated by changing a resistance value of the resistance-regulating unit; and
a voltage testing circuit comprising a second comparator and a display member connected to an output of the second comparator, the voltage of the interface being input to one input of the second comparator to compare with a reference voltage, the second comparator outputting a signal to control the display member to display a comparison result. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A testing circuit adapted for an interface, the testing circuit comprising:
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a first comparator, a negative input of the first comparator connected to the interface, a positive input of the first comparator being input a reference voltage;
a second comparator, a positive input of the second comparator being input the reference voltage, a negative input of the second comparator connected to an output of the first comparator;
a first display member connected to the output of the first comparator, the voltage of the interface being compared with the reference voltage, the first comparator outputting a signal to control the first display member to display a comparison result; and
a second display member connected to an output of the second comparator, the voltage from the output of the first comparator being compared with the reference voltage, the second comparator outputting a signal to control the second display member to display a comparison result. - View Dependent Claims (8, 9, 10, 11)
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12. A circuit for testing an interface, comprising:
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a load feeding circuit electrically connectable with an interface to be tested to provide a load for said interface to function, said load feeding circuit comprising a resistance-regulating unit so as to regulate said provided load for said interface by means of varying a resistance value of said resistance-regulating unit; and
a voltage testing circuit electrically connectable with said interface to receive output of said interface, said voltage testing circuit comprising a display member and a comparator electrically connectable between said interface and said display member, said comparator receiving an output voltage from said interface and a reference voltage for comparison in order to controllably output to said display member for displaying comparison results of said output voltage and said reference voltage. - View Dependent Claims (13)
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Specification