Switching-mode absolute-value amplifier and its applications

Proposes methods of absolute-value and variable-phase operations using switching techniques. These methods show high efficiency and characteristics suitable for use in very-low-frequency regions due to its sampling effects. This paper introduces the basic principle, theoretical analysis, and characteristics of the switching-mode absolute-value amplifier and presents the realization of a variable-phase ultra-low-frequency signal generator by means of the switching-mode operations.