An MMIC active filter with 60-dB rejection

The design, fabrication, and characterization of a GaAs monolithic, active, 4-GHz bandpass filter with 60-dB edge-of-band rejection are described. A predistorted transfer function is realized by a set of cascaded-, lumped-, and distributed-element inductance-capacitance circuits isolated by two feedback amplifiers. The monolithic microwave integrated circuit (MMIC) consists of two identical 3-mm*2-mm GaAs chips. A remarkable advantage of this circuit over other resonant-based implementations is the absence of a second harmonic passband.<<ETX>>

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