Broadband RF power detector using FET

Details Broadband RF power detector using FET Broadband RF power detector using FET

1984-03-05

1987-03-03

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With waveguide or long line

307550, G01R 2304, H03B 104

Patent

active

046478485

ABSTRACT:
A junction field effect transistor circuit is used to detect the power level contained in radio frequency signals over a wide range of frequencies and signal levels. The radio frequency signal is coupled to the drain of a junction field effect transistor, the gate of which is biased at a d.c. potential equal to the pinch off voltage. The radio frequency signal is also coupled to the gate. The resulting current from the source contains a d.c. term proportional to the square of the magnitude of the radio frequency signal, as well as time varying signal components. A low pass filter is employed to remove the time varying signal components from the resulting source current to produce a D.C. output current which is proportional to the power level of the input signal.

REFERENCES:
patent: 3348062 (1967-10-01), Carlson et al.
patent: 3694744 (1972-09-01), Kalotay

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