Title:
高速電圧制御発振器
Document Type and Number:
Japanese Patent JP2005501457
Kind Code:
A
Abstract:
The invention provides an improved high speed voltage controlled oscillator (VCO) buffer cell, with consistent output performance. According to one embodiment of the invention, the cell comprises a differential pair of transistors and a current mirror circuit. The differential pair has input terminals for receiving input signals and output terminals for providing differential voltage swing in response to the input signals. The current mirror circuit is operably coupled to the pair of transistors and is configured to receive a first external reference current and provide a mirrored current to an active one of the transistors. The differential voltage swing has a frequency which is determined based on the reference current. In a specific embodiment of the invention, the pair of transistors of the cell is bipolar transistors, and the current mirror circuit is composed of CMOS transistors.
Inventors:
West Jeffrey A
Application Number:
JP2003524105A
Publication Date:
January 13, 2005
Filing Date:
August 02, 2002
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H03K3/282; H03B5/24; H03K3/0231; H03K3/03; H03K3/354; (IPC1-7): H03K3/0231; H03K3/282
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Akihiko Miyazaki
Fueda Shusen