Supply regulated voltage controlled oscillator including active loop filter and phase locked loop using the same

Patent metadata

Field	Value
Publication number	US-9048849-B2
Application number	US-201313926233-A
Country	US
Kind code	B2
Filing date	Jun 25, 2013
Priority date	Sep 26, 2012
Publication date	Jun 2, 2015
Grant date	Jun 2, 2015

Abstract

The inventive concept relates to a supply regulated voltage controlled oscillator having a function of an active loop filter by sharing one operational amplifier without additional use of active elements in a supply regulated voltage controlled oscillator using an operational amplifier as a supply regulator, and a phase locked loop using the same.

First claim

What is claimed is:

1. A phase locked loop comprising:
a phase frequency detector comparing a reference frequency and a frequency of a signal corresponding to a clock signal to output a pulse signal in response to a difference between the reference frequency and the frequency of the signal;
a charge pump controlling charge amount on the basis of the pulse signal; and
a supply regulated voltage controlled oscillator outputting the clock signal in response to an input signal, th…

Assignees

• Univ Yonsei Iacf

Inventors

• Choi Woo-Young
• Choi Kwang-Chun

Classifications

• H03L7/099 Primary

  Electricity · mapped topic

• H03L7/0995

  Electricity · mapped topic

• H03L7/18

  Electricity · mapped topic

• H03L7/093 Primary

  Electricity · mapped topic

• H03B5/04 Primary

  Electricity · mapped topic