Patent ID: 6825731
Filing Date: 2004-11-30
Classification: H03K,H03L

Abstract:
A voltage controlled oscillator comprising:N (N is an integer equal to or more than 2) inversion-type differential amplifiers connected in a loop such that each of output signals outputted from one of said N inversion-type differential amplifiers has an opposite polarity to a corresponding one of output signals outputted from the next one of said N inversion-type differential amplifiers; and a level converter connected to one of said N inversion-type differential amplifiers as a last inversion-type differential amplifier to generate an oscillation signal from the output signals outputted from said last inversion-type differential amplifier, and wherein each of said N inversion-type differential amplifiers operates in response to a predetermined voltage and a control voltage, and either of said voltages is directly connected to a single element in each of said N inversion-type differential amplifiers, each of said single elements having one terminal grounded.