Back to results
US 2003/0156661 A1Published application
Receiver and receiving method
OwnerShigeki Nakamurainventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerShigeki Nakamurainventor
Estimating the term…
A receiver 1 comprises a tracking filter 9 connected to the signal receiving side of the field effect transistor (FET) 10 of a tracking filter circuit 2 and a frequency converter 3 connected to the tracking filter circuit 2. A control signal is applied from an AGC circuit 15 to the gate of the FET 10 to detect the receiving level of the signal being received. A predetermined tuning voltage is applied from a D/A converter 7 to the tracking filter 9 according to the control signal from a microcomputer 8. When the signal receiving level is high, a filtering characteristic for power matching is selected for the tracking filter 9. On the other hand, when the signal receiving level falls to a certain extent, a filtering characteristic for NF matching is selected for the tracking filter 9 for the tracking purpose. With this arrangement, the signal receivable range is broadened and the signal receiving sensitivity is improved for the receiver 1.
A receiver comprising a tracking filter circuit for selectively extracting a predetermined frequency band,
A receiving method for selectively extracting a predetermined frequency band by utilizing both a filtering characteristic adapted to lay stress on reduction of the passing loss of the predetermined frequency band and a filtering characteristic adapted to lay stress on the noise figure in order to reduce the noise level of the signal being received.
Dependencies are inferred from the claim text.