Patent ID: 7679349

Claim:
An electronic circuit comprising: a first switching transistor having a first terminal, a second terminal, a control terminal, and a first resistance between the first terminal and the second terminal when the control terminal is in an on state, the first terminal coupled to a first node receiving a first switching current, the second terminal coupled to a reference voltage, and the control terminal coupled to receive a switching signal; a second switching transistor having a first terminal coupled to the first terminal of the first switching transistor, a second terminal, a control terminal coupled to the control terminal of the first switching transistor, and a second resistance between the first terminal and the second terminal when the control terminal is in the on state; and one or more transistors coupled in a first series, each transistor having a first terminal, a second terminal, a control terminal coupled to a bias voltage, and a third resistance between the first terminal and the second terminal, wherein a first terminal of an initial transistor in the first series is coupled to the second terminal of the second switching transistor, and a second terminal of a last transistor in the first series is coupled to the reference voltage, wherein a sense current corresponding to the first switching current is coupled to a second node between the second terminal of the second switching transistor and the first terminal of the initial transistor in the first series, and in accordance therewith, produces a switching voltage corresponding to said first switching current.