Self-test device and method having an amplifier converted into a

Details Self-test device and method having an amplifier converted into a Self-test device and method having an amplifier converted into a

1987-09-28

1989-09-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455 67, 455341, 330112, 331 59, 324 83R, 324 83FE, H04B 1700, H03F 140

Patent

active

048646393

ABSTRACT:
An FM receiver is self tested by connecting a positive feedback network in circuit with a wideband, front end r.f. amplifier of the receiver, so that the amplifier is converted into an oscillator. R.f. and i.f. characteristics of the receiver are determined by comparing the amplitude of an i.f. signal with a predetermined reference value while the amplifier is converted to an oscillator. Noise characteristics of the receiver are determined by comparing the amplitude of an audio frequency signal of the receiver with a predetermined value while the amplifier is converted to an oscillator and the amplifier derives an unmodulated r.f. output. Baseband characteristics of the receiver are determined by varying a reactance in the positive feedback path to impose FM on r.f. oscillations derived by the amplifier and by comparing the amplitude of the output of the audio frequency amplifier with a predetermined value. By varying the value of the reactance in the feedback loop, the oscillating frequency is swept to determine the center operating frequency and i.f. bandwidth of the r.f., amplifier.

REFERENCES:
patent: 3012197 (1961-12-01), Peterson et al.
patent: 3038070 (1962-06-01), MacDonald
patent: 3196357 (1965-07-01), Hoag
patent: 3484692 (1969-12-01), Lode
patent: 3755741 (1973-08-01), Stover
patent: 4001732 (1977-01-01), Gundry
patent: 4060767 (1977-11-01), Lohrmann
patent: 4124780 (1978-11-01), Ogita
patent: 4360928 (1982-11-01), Campbell

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