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The Interference Noise in High-Quality Push-Pull Frequency Modulators

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1 Author(s)
Otala, M. ; Dept. of Elec. Engr.,Univ. of Oulu,Finland

There exists a special kind of loading noise in highly linear push-pull frequency modulators used in radio links. It is caused by the higher order interference products in the mixer of the modulator. This noise can be very annoying and necessitates a careful selection of the oscillator frequencies. The theory leading to optimum frequencies is shown, and equations for the direct calculation of the baseband-interference loading noise are given. Reference is made to experimental results.

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Communication Technology, IEEE Transactions on  (Volume:18 ,  Issue: 3 )