Title:
半導体装置
Document Type and Number:
Japanese Patent JP4416735
Kind Code:
B2
Abstract:
A voltage-controlled oscillation circuit (15) includes a plurality of independent ring oscillation circuits different in the number of stages; and a selector (22) selectively outputting as a feedback clock signal (FB) an output of one of the ring oscillation circuits, so that any of the outputs of the independent ring oscillation circuits is always outputted as the feedback clock signal, which makes it possible to output the feedback clock signal keeping a proper duty ratio even when the operating speed is high, allowing arbitrary adjustment of the delay time before an input signal (DLLI) is outputted.
Inventors:
Hiroaki Yamanaka
Kunimitsu Kosaka
Kiyoshi Nishiwaki
Kunimitsu Kosaka
Kiyoshi Nishiwaki
Application Number:
JP2005509603A
Publication Date:
February 17, 2010
Filing Date:
October 17, 2003
Export Citation:
Assignee:
Fujitsu Microelectronics Limited
International Classes:
H03L7/081; H03K3/03; H03K3/354; H03K5/13; H03K19/017; H03L7/099
Domestic Patent References:
| JP2000341099A | ||||
| JP2000232356A | ||||
| JP2000269809A | ||||
| JP8148997A | ||||
| JP6104748A |
Attorney, Agent or Firm:
Takayoshi Kokubun