公开(公告)号：US20140159825A1

公开(公告)日：2014-06-12

申请号：US14102125

申请日：2013-12-10

Applicant: Texas Instruments Incorporated

Inventor： Sreekiran Samala ,  Vijay Rentala

IPC: H03B5/18

CPC classification number: H03B5/1228 ,  H03B5/1212 ,  H03B5/124 ,  H03B2200/009

Abstract: A voltage controlled oscillator (VCO) includes an LC tank circuit coupled between a supply terminal, a first node and a second node. A pair of cross coupled transistors is coupled to the first node and the second node. A degeneration inductor, center tapped to a ground terminal, is coupled to the pair of cross coupled transistors configured to inductively degenerate each of the pair of cross coupled transistors and configured to resonate a source capacitance of each of the pair of cross coupled transistors. The VCO is configured to be having a low phase noise with high quality factor using inductive degeneration.

Abstract translation: 压控振荡器（VCO）包括耦合在电源端子，第一节点和第二节点之间的LC谐振电路。 一对交叉耦合晶体管耦合到第一节点和第二节点。 耦合到接地端子的中心抽头的退化电感器被耦合到一对交叉耦合的晶体管，其被配置为感应地简化该对交叉耦合的晶体管中的每一个，并且被配置为谐振该对交叉耦合晶体管中的每一个的源极电容。 VCO被配置为具有使用电感退化的高品质因数的低相位噪声。