公开(公告)号：US10454418B1

公开(公告)日：2019-10-22

申请号：US15432781

申请日：2017-02-14

Applicant: Xilinx, Inc.

Inventor： Ankur Jain ,  Jaeseo Lee ,  Richard W. Swanson

IPC: H03B1/00 ,  H03K3/03 ,  H03L7/099 ,  G05F1/46 ,  G05F1/575

Abstract: In an example, a voltage-controlled oscillator (VCO) includes: an oscillator having a supply input; and a voltage regulator, coupled to the supply input. The voltage regulator includes: a first transistor and a second transistor providing a first source-coupled transistor pair, and a third transistor and a fourth transistor providing a second source-coupled transistor pair; an active load coupled to drains of the first, second, third, and fourth transistors; a first current source coupled to sources of the first and second transistors, and a second current source coupled to sources of the third and fourth transistors; a fifth transistor having a source and a drain coupled to the source and the drain, respectively, of the first transistor; and a sixth transistor having a source and a drain coupled to the source and the drain, respectively, of the third transistor.