TUNABLE LC FILTERS WITH LOW NONLINEAR DISTORTIONS
The article discusses the design of tunable bandpass filters based on varactor diodes and discrete variable capacitors. It is shown that conversion ratios of the converters or Norton transformations have a significant influence on the filter nonlinear distortions. The authors give recommendations for design of tunable filters with low nonlinear distortions. It is found that the design of tunable filters requires a compromise between the values of nonlinear distortions and passband losses.