IC design of an analog tunable crossover network

This paper presents a tunable crossover circuit for audio applications, to be implemented in a standard 0.35 /spl mu/m CMOS process. The circuit is based on the decomposition of low-pass and high-pass transfer functions into two structurally all-pass building blocks. The transconductors (OTA) incorporate source degenerated current mirrors (SDCM), to allow wide and highly linear tuning range, while keeping the input and output signal swings constant. Simulation results, with practical process parameters, are presented.