Back to results
US 5,636,262 AGranted
Interface scanning circuit
AssigneeTelefonica de Espana, S.A.
InventorJesus P. Melian
Life of this patent
Estimating the term…
Abstract
An interface scanning circuit includes a current source at the input to a multiplexer. The current source includes a transistor disposed between two resistors, the second one of which limits reverse current. Also provided are an attenuating network including two resistors, and a low pass filter capacitor associated with the attenuating network.
Claims1
An interface scanning circuit which receives scanning interface input signals, the circuit comprising:
- a) an analog multiplexer;
- and
- b) a current source, the current source including:
- b1) a first resistor;
- b2) a transistor coupled to the first resistor;
- b3) a second resistor means, coupled to the transistor, for limiting a value of reverse current;
- b4) an attenuating network, coupled to the second resistor, and including third and fourth resistors;
- and
- b5) a low-pass filter capacitor coupled to the attenuating network.
6 more elements
Dependencies are inferred from the claim text.