Title:
【発明の名称】発振周波数調整装置
Document Type and Number:
Japanese Patent JP3367465
Kind Code:
B2
Abstract:
An oscillating circuit removes a phase difference from between an input signal variable in frequency and a free-running oscillation signal through a two-step voltage-to-frequency control, wherein a frequency comparator, a detector, a flip flop circuit cooperates with a counter so as to vary a control range of the voltage-controlled oscillator in the vicinity of the input frequency, and, thereafter, a phase comparator makes the free-running oscillation signal synchronous with the input signal through the phase comparison therebetween, even if the voltage-to-frequency characteristics of the voltage-controlled oscillator is deviated from a design range, the deviation is taken up through the first-step control so that the manufacturer can delete an external regulator from the oscillating circuit.
Inventors:
Kenji Mori
Application Number:
JP13246499A
Publication Date:
January 14, 2003
Filing Date:
May 13, 1999
Export Citation:
Assignee:
NEC
International Classes:
H03L7/06; H03L7/087; H03L7/095; H03L7/099; H03L7/113; H03L7/12; (IPC1-7): H03L7/087; H03L7/099; H03L7/12
Domestic Patent References:
| JP5268078A | ||||
| JP10164395A | ||||
| JP9246963A | ||||
| JP3274917A | ||||
| JP2100348U |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)