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Parametric amplifiers are distinguished from most active networks in that power is taken directly from an a-c source and that the phase of this source is significant in the amplification process. As a consequence of the harmonic spectrum produced by the interaction of the power source (pump) and the nonlinear element, the introduction of a small signal generates a pair of sidebands about each harmonic. Networks with variable parameters may be handled with an extension of the conventional formalism into one of frequency as well as spatial scattering.
Broadcast and Television Receivers, IRE Transactions on (Volume:BTR-5 , Issue: 3 )
Date of Publication: Dec. 1959