Current-mode BiCMOS sliding-mode controller circuit for AC signal generation in switching power DC-DC converters

This communication describes the design of a microelectronic BiCMOS analog circuit, intended to be applied to the sliding-mode control of switching DC-DC power converters for the application of generating a sinusoidal signal with externally adjustable amplitude, frequency and offset. The circuit implements a sliding law over a nonlinear autonomous switching surface. The proposal of this analog design, which operates in current-mode, represents good performance as long as operation speed, power consumption, suitability for low voltage operation and interference robustness are concerned. The main circuit is composed of externally linearized transconductors based on current conveyors, current-mode full-wave rectifiers and transimpedance high-speed comparators, as well as bipolar translinear squaring cells. HSPICE transistor-level simulations for a BiCMOS 1.2 μm technology validate the functionality of the proposed sliding-mode controller implementation