Bias circuit having signal output to detector portion
AssigneeFujitsu Limited
InventorYoshiyasu Tsuruoka
Life of this patent
Estimating the term…
Abstract
In a bias circuit including a transmission line and an open stub for preventing a microwave signal from passing through, the lengths of the open stub and a transmission line between the open stub and main transmission line are near .lambda./4 but not equal to .lambda./4. A leakage signal caused by the above deviations is fed to a detector portion. In the above construction, circuit size of the bias circuit and the detector portion is minimized.
Claims9
A bias circuit for supplying a main transmission line with a bias voltage and for taking out a detection signal from the main transmission line, the detection signal being for use in detection of a level of a main signal transmitted on the main transmission line, the circuit comprising:
- a first transmission line connected to the main transmission line at one end of the first transmission line;
- a second transmission line opened at one end thereof and connected to the other end of the first transmission line at the other end of the second transmission line;
- a conductive line connected to said other end of the second transmission line for feeding the bias voltage through the first transmission line to the main transmission line;
- a terminal provided between the second transmission line and the conductive line, for taking out the detection signal;
- and
- a detector portion connected to said terminal and receiving the detection signal therefrom for detecting a level of a leakage signal leaked from the main transmission line.
A bias/detector circuit for supplying a main transmission line with a bias voltage and for detecting a level of a main signal transmitted on the main transmission line, comprising:
- a first transmission line connected to the main transmission line at one end of the first transmission line;
- a second transmission line opened at one end thereof and connected to the other end of the first transmission line at the other end of the second transmission line;
- a conductive line connected to said other end of the second transmission line for feeding the bias voltage through the first transmission line to the main transmission line;
- and
- a detector portion connected to a point between the second transmission line and the conductive line, for detecting a level of a leakage signal leaked from the main transmission line, to thereby output a detection signal.
Dependencies are inferred from the claim text.