Patent ID: 6462528
Filing Date: 2002-10-08
Classification: G01R,H01L

Abstract:
An arrangement for probing a signal at a terminal of an electronic device, comprising:an input coupled to said terminal for receiving said signal; a tip resistor having a tolerance in a range greater than 1%, said tip resistor having a first end coupled to said input for receiving said signal, and being physically located substantially adjacent to said terminal of said electronic device; a transmission line having an input end coupled to a second end of said tip resistor for receiving said signal, and having an output end; and an amplifier having a first input coupled to said output end of said transmission line for receiving said signal and amplifying said signal when said signal exceeds a predetermined reference value; said amplifier being biased to said reference level, said reference level being substantially identical to a reference level exhibited by said signal at said input; wherein said amplifier is biased to said reference level by a biasing circuit comprising: a source of reference level potential; and a second resistor having a first end coupled to said source of reference level potential at a junction, and having a second end coupled to said output end of said transmission line, said transmission line having a characteristic impedance and said second resistor having a value substantially equal to said characteristic impedance; and wherein said junction of said source of reference level potential and said second resistor is coupled to a second input of said amplifier.