关键词: 小型化, 宽带, 电调衰减, P型-本征-N型（PIN）二极管, Π型衰减网络, 基板塑封

Abstract: To meet the demand for miniaturization of electronic tuning attenuators in automatic gain control (AGC) circuits, a miniaturized wide-band electronic tuning attenuator is realized using a symmetric Π-type attenuation networkconsisting of four P-type-intrinsic-N-type (PIN) diodes by means of circuit design and substrate molding process.The electronic tuning attenuator is powered by a 2.7 V power supply and operated with a 1.0-5.0 V control voltage.The test results show that the minimum insertion loss of the electronic tuning attenuator is less than 2.9 dB in absolute value, its maximum attenuation is more than 35.0 dBin absolute value, and its return loss is less than －10 dBwhen the operating frequency band is 30-1000 MHz.Its packaging size is 3.8 mm×3.8 mm×1.0 mm, and the single device massis 38 mg. The electronic tuning attenuator meets the requirements of broadband and low insertion loss, and has the characteristics of miniaturization, high integration, and lightweight.

Key words: miniaturization, wide-band, electronic tuning attenuation, P-type-intrinsic-N-type (PIN) diodes, Π-type attenuation network, substrate molding process