Patent ID: 8154352
Filing Date: 2012-04-10
Classification: H03B,H03K

Abstract:
1. An oscillating circuit comprising: N (N denotes even numbers of four or more) nodes configured to output oscillating signals having respective different phases; a main loop circuit including N inverting circuits cascaded in a form of a ring via said N nodes: and a plurality of auxiliary loop circuits each including even numbers of inverting circuits cascaded in a form of a ring, wherein each inverting circuit in said auxiliary loop circuits is connected in parallel with even numbers of inverting circuits cascaded in said main loop circuit, circuits configured to feed back signals from outputs to inputs of the respective inverters of said main loop circuit have circuit configurations equivalent to each other, and each inverting circuit in said main loop circuit and said auxiliary loop circuits drives an output line such that a phase of an output signal is inverted with respect to a phase of an input signal and has driving power that becomes lower when the phases of the output signal and the input signal are inverted with respect to each other than when the output signal and the input signal are in phase with each other; a common node to which power supply input terminals of the respective inverting circuits of said main loop circuit and said auxiliary loop circuits are commonly connected; and a current source circuit configured to hold constant a sum total of power supply currents supplied to the respective inverting circuits via said common node.