High-side signal sensing circuit
AssigneeSystem General Corp.
InventorsTa-Yung Yang, Kai-Fang Wei, Yen-Ting Chen
Life of this patent
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Abstract
The present invention provides a high-side signal sensing circuit. The high-side signal sensing circuit comprises a signal-to-current converter, a second transistor and a resistor. The signal-to-current converter has a first transistor generating a mirror current in response to an input signal. The second transistor cascaded with the first transistor is coupled to receive the mirror current. The resistor generates an output signal in response to the mirror current. Wherein, the level of the output signal is corrected to the level of the input signal.
Claims10
A high-side signal sensing circuit, comprising:
- a signal-to-current converter having a first resistor and a first transistor, the first transistor generating a mirror current in response to an input signal;
- a second transistor being serially connected with the first transistor coupled to receive the mirror current;
- and
- a second resistor being directly and serially connected with the second transistor and generating an output signal in response to the mirror current;
- wherein the level of the output signal is proportional to the level of the input signal and a ratio of the second resistor to the first resistor;
- wherein by sensing a cross-voltage of the first resistor, a current flowed through the second resistor is obtained.
A high-side signal detecting circuit, comprising:
- a first circuit having a first resistor located in a substrate;
- a second circuit having a second resistor and a first transistor, the second resistor being directly and serially connected with the first transistor, the first transistor located in an isolated well generating a mirror current in response to an input signal;
- and
- a third circuit having a second transistor being serially connected with the first transistor coupled to deliver the mirror current to the first circuit;
- wherein the first resistor generates an output signal in response to the mirror current, the level of the output signal is proportional to the level of the input signal and a ratio of the first resistor to the second resistor,
- wherein by sensing a cross-voltage of the second resistor, a current flowed through the first resistor is obtained.
Dependencies are inferred from the claim text.