Evaluation circuit for electronic signal transmitters

An evaluation circuit for an electronic signal transducer (6,6′), said evaluation circuit comprising

• a current interface (1;1′;
• 11,11′) for supplying a current signal (i2) from the electronic signal transducer (6,6′);
• a current-sensing field effect transistor (3,3′;
• 13,13′) having a gate (G), a source (S), a drain (D) and a sensing output (sense), said current-sensing field effect transistor being connected with said current interface (1,1′;
• 11,11′) so that said current signal (i2) supplied by said transducer (6,6′) passes through said source (S) and said drain (D);
• monitoring circuit means (5,5′;
• 15,15′) for controlling said currrent-sensing field effect transistor (3,3′;
• 13,13′) in the event of erroneous operation or malfunction, said monitoring circuit means having an output terminal connected to said gate (G) of said current-sensing field effect transistor (3,3′;
• 13,13′) and an input terminal connected to said drain (D) or said source (S) of said current-sensing field effect transistor (3,3′;
• 13,13′);
• a current reflector circuit (4,4′;
• 14,14′) having an input and an output, wherein said input of said current reflector circuit is connected to said sensing output (sense) of said current-sensing field effect transistor (3,3′;
• 13,13′);
• and
• means (2,2′) for converting current to voltage, said means for converting being connected to said output of said current reflector circuit (4,4′;
• 14,14′), so that said current signal (i2) is converted to a voltage signal (Us).