RING-TYPE VOLTAGE CONTROLLED OSCILLATOR

• Main Authors: NA, YOO SAM, KIM, GYU SUCK
• Format: Patent
• Language: English; Korean
• Published: 08.10.2014
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

The present invention relates to a ring type voltage controlling oscillator. In the ring type voltage controlling oscillator according to the present invention, multiple delay cells are connected in a chain form. The delay cell includes: first to fourth MOSs which control an oscillation frequency which oscillates through an output terminal (Vout); and a fifth MOS which is connected to the common node of each source of the first to fourth MOSs and controls the first to fourth MOSs. The present invention respectively controls a control voltage (Vctrl) of a fixed size which is applied to the gate terminal of the fifth MOS, a body voltage (Vbody) which is applied to a body, and a voltage which is applied to the gate terminal and the body. The present invention is able to improve a Kvco (VCO′s gain) by controlling two voltages at the same time by respectively applying to the gate and body of the fifth MOS which controls the first to fourth MOSs which control an oscillation frequency in the delay cell, and thereby is able to improve a PLL system function and a phase noise feature.