A constant-transfer-function widely-tunable VHF modular field-programmable filter array (FPFA) with IIP3 of 38–52 dBm

A 3D modular field-programmable filter array (FPFA) with high third-order input intercept point (IIP3) capable of delivering a constant transfer function through an octave tuning range is presented in this paper. An RF design methodology to fulfill the concept of an FPFA in a modular configuration is reported for the first time. The theoretical concept and its associated practical RF design considerations for IIP3 improvement in an octave tuning range are discussed. This modular FPFA allows for hardware extension at will, addressing the needs of next generation RF front-ends with multi-standard operability. An experimental 3D four-resonator FPFA has been designed, built and measured for proof-of-concept demonstration purposes. It functionalizes transfer functions with variable: i) order, ii) center frequency and iii) bandwidth. Furthermore, within an octave tuning range (98-194 MHz), the IIP3 was measured between 38-52 dBm.