Title：A voltage controlled oscillator

Country：China

Patent No.：201410422109.4

Legal Status：Authorized

Inventor：Baoyong Chi, Siyang Han, Zehong Zhang, Zhihua Wang

Assignee：Tsinghua University

Address：Mailbox No. 82, Beijing 100084

Filing Date：2014-08-25

Issue Date：2017-09-22

The invention relates to a voltage-controlled oscillator which comprises a voltage-controlled oscillating circuit. The voltage-controlled oscillating circuit comprises an LC resonance unit, an oscillation-starting oscillating unit and a bias voltage adjustment unit. The oscillation-starting oscillating unit comprises a first transistor and a second transistor which are in cross coupling, the drain of the first transistor and the drain of the second transistor are connected with the two ends of a differential inductor of the LC resonance unit respectively, the voltage of the drains is changed along with changes of the same bias voltage, and the sources receive the same bias current. The bias voltage adjustment unit provides the bias voltage to the oscillation-starting oscillating unit and adjusts the bias voltage to enable conductive angles of the first transistor and the second transistor to be changed from 0 degree to 180 degrees, and therefore the LC resonance unit starts to oscillate in a CLASS-AB mode and oscillates in a CLASS-C mode. In addition, the voltage-controlled oscillating circuit is provided with a bias current adjustment unit, and the bias current adjustment unit provides the bias current to the oscillation-starting oscillating unit to achieve power dissipation configuration and phase noise configuration.

Patent Certificate： PDF/Jpg