Current-mode BiCMOS sliding-mode controller circuit for AC signal generation in switching power DC-DC converters
نویسندگان
چکیده
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 highspeed comparators, as well as bipolar translinear squaring cells. HSPICE transistor-level simulations for a BiCMOS 1.2μm technology validate the functionality of the proposed sliding-mode controller implementation.
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