Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1978-11-13
1980-02-19
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325147, 325148, 331 23, 331 25, 332 19, H03C 304
Patent
active
041896890
ABSTRACT:
An automatic modulation leveling circuit gain controlled by the tuning voltage level into the voltage controlled oscillator of an FM frequency synthesizer providing a normalized modulation gain. The automatic modulation leveling circuit is used in a basic 10 KHz tuning increment direct synthesizer with a skewed frequency standard deriving four intermediate tuning steps of 2.5 KHz each. The leveling circuit includes an amplifier with gain to both DC and AC set by the ratio of a feedback resistor to the value of an input resistor that is a photo resistor subject to resistance change with light variance of a light emitting diode as driven by a second amplifier in the circuit. The second amplifier provides, in the circuit environment, an output responsive to frequency synthesizer tuning voltage with gain such as to result in a certain level of modulation across the RF tuning band being proportional to the tuning voltage and automatic adjustment of leveling circuit gain to the proper level as indicated and determined by the tuning voltage into the VCO for substantially uniform deviation across the entire tuning band.
REFERENCES:
patent: 3225304 (1965-12-01), Richards
patent: 3393380 (1968-07-01), Webb et al.
patent: 3699468 (1972-10-01), Harmgardt
patent: 4030034 (1977-06-01), Ruegg
patent: 4052672 (1977-10-01), Enderby et al.
Weisbecker, "Designing a Feedback System", Electronic Design, vol. 13, No. 18, Aug. 30, 1965, pp. 32, 34, 35.
Grimm Siegfried H.
Kintzinger Warren H.
Wulfsberg Electronics, Inc.
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