Receiver

Details Receiver Receiver

2008-05-13

2008-05-13

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S302000

Reexamination Certificate

active

11102317

ABSTRACT:
A receiver includes a tuning circuit for picking up a reception signal having a desired frequency, a local oscillator for forming an oscillation signal, a first mixer for frequency-converting the reception signal into an IF signal by using the oscillation signal, an IF filter for deriving the IF signal from an output signal of the first mixer, a signal forming circuit for forming an AC signal having a frequency equal to a frequency of the IF signal, a second mixer to be supplied with the AC signal and the oscillation signal, a deriving circuit for deriving a signal having a desired frequency or an image frequency from an output of the second mixer, and a detector for detecting a level of the IF signal, wherein a self test is performed by supplying the signal derived from the deriving circuit to the tuning circuit and checking a detection output level of the detector.

REFERENCES:
patent: 2005/0221776 (2005-10-01), Okanobu
patent: 2006/0035612 (2006-02-01), Miyagi et al.

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