Title:
VOLTAGE CONTROLLED OSCILLATOR CIRCUIT AND PHASE SYNCHRONIZATION CIRCUIT
Document Type and Number:
Japanese Patent JP3633202
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a voltage controlled oscillator circuit by which high frequency oscillation is attained with low current consumption and the phase synchronization circuit.
SOLUTION: One output of a ring oscillator consisting of differential amplifiers 1A-1C is given to a variable threshold level logic circuit 13, and an output of the variable threshold level logic circuit 13 is used for an output of the voltage controlled oscillator circuit. Then a threshold level control input VT of the variable threshold level logic circuit 13 is controlled by an output of a voltage conversion circuit that converts a low frequency component of a filter circuit output of the phase synchronization circuit proportionally.
Inventors:
Akira Abe
Application Number:
JP12270197A
Publication Date:
March 30, 2005
Filing Date:
May 13, 1997
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
H03K3/354; H03L7/099; (IPC1-7): H03K3/354; H03L7/099
Domestic Patent References:
| JP8274529A | ||||
| JP8102646A | ||||
| JP529886A | ||||
| JP327619A | ||||
| JP2151117A |
Attorney, Agent or Firm:
Masahiko Ueyanagi
Osamu Suzawa
Osamu Suzawa