EMI FILTERING DETECTOR AND METHOD FOR SAME

1 . A circuit for detecting electromagnetic radiation, comprising:

at least one sensor element connected to convert electromagnetic radiation which strikes at least one sensor element into an electric signal;

a field effect transistor connected to receive said electric signal from said at least one sensor element, said field effect transistor having a gate terminal, a drain terminal, and a source terminal from which an output signal of said circuit is output;

a printed circuit board comprising at least one low inductance low resistance area selected from the group consisting of a drain terminal trace, a source terminal trace, and a ground connector pad;

a first source-ground capacitor connected between said source terminal and ground;

a drain-ground capacitor connected between said drain terminal and ground;

a gate resistor connected in parallel with said at least one sensor element or a resistor included in said at least one sensor element; and

an inductor and resistor connected to said drain terminal through which a supply voltage is supplied to said field effect transistor.

2 . The circuit of claim 1 , wherein said printed circuit board comprises a first side and a second side, and said field effect transistor is disposed upon said first side.

3 . The circuit of claim 2 , wherein said ground connector pad is disposed upon said second side and connected to a first side ground connector trace through a via.

4 . The circuit of claim 3 , wherein said drain terminal trace is disposed upon said first side.

5 . The circuit of claim 3 , wherein said source terminal trace is disposed upon said first side.

6 . The circuit of claim 1 , wherein said at least one sensor element is connected between said gate of said field effect transistor and ground.

7 . The circuit of claim 1 , further comprising a second source-ground capacitor connected between said source terminal and ground, wherein said second source-ground capacitor has a different capacitance value from said first source-ground capacitor.

8 . The circuit of claim 1 , wherein said at least one sensor element detects infrared radiation.

9 . The circuit of claim 8 , wherein said at least one sensor element is a pyroelectric cell.

10 . The circuit of claim 9 , wherein said at least one sensor element is a first sensor element and further comprising a second sensor element which is a pyroelectric cell, said pyroelectric cells being connected in antipolar fashion.

11 . The circuit of claim 1 , further comprising a housing enclosing said at least one sensor element and said field effect transistor and said impedance.

12 . The circuit of claim 1 , wherein said field effect transistor is connected as an impedance converter.

13 . The circuit of claim 1 , wherein said impedance further includes an inductance.

14 . The circuit of claim 10 , wherein said two pyro electric cells are connected serially.

15 . The circuit of in claim 10 , wherein said two pyroelectric cells are connected in parallel to one another.

16 . A method for manufacturing a detector for sensing electromagnetic radiation comprising a printed circuit board configured to electrically connect at least one pyroelectric sensor element connected to convert electromagnetic radiation which strikes at least one sensor element into an electric signal, an n-channel junction field effect transistor connected to receive said electric signal from said at least one sensor element, said field effect transistor having a gate terminal, a source terminal from which an output signal of said circuit is output, and said field effect transistor having a drain terminal, said method comprising the step of:

forming at least one low inductance low resistance area on said printed circuit board.

17 . The method of claim 16 , wherein said printed circuit board comprises a first side and a second side, and said printed circuit board is configured to mount said field effect transistor on said first side.

18 . The method of claim 17 , wherein said at least one low inductance low resistance area is selected from the group consisting of a drain terminal trace, a source terminal trace, and a ground connector pad.

19 . The circuit of claim 18 , further comprising the steps of:

positioning said ground connector pad upon said second side; and

positioning drain terminal trace on said first side.

20 . The circuit of claim 18 , further comprising the steps of:

positioning said ground connector pad upon said second side; and

positioning source terminal trace on said first side.

21 . A circuit for detecting electromagnetic radiation, comprising:

at least one pyroelectric sensor element connected to convert electromagnetic radiation which strikes at least one sensor element into an electric signal;

an n-channel junction field effect transistor connected to receive said electric signal from said at least one sensor element, said field effect transistor having a gate terminal, a source terminal from which an output signal of said circuit is output, and said field effect transistor having a drain terminal;

a source-ground capacitor connected between said source terminal and ground;

a drain-ground capacitor connected between said drain terminal and ground;

a gate resistor connected in parallel to said at least one sensor element or a resistor included in said at least one sensor element; and

an inductor and resistor connected to said drain terminal of said field effect transistor through which a supply voltage is supplied to said field effect transistor.