Title:
OSCILLATION CIRCUIT
Document Type and Number:
Japanese Patent JP2004242296
Kind Code:
A
Abstract:
To provide an oscillation circuit in which linearity for a current for controlling an oscillation frequency is improved, in the oscillation circuit for realizing a wide oscillation frequency range.
NMOS transistors MN4, MN5, MN6 which are limiting elements for limiting an amplitude of an oscillation output, are serially inserted on the drain side of constant current sources, so that the amplitude of the oscillation output resulting from constant current charge or constant current discharge from PMOS transistors MP1, MP2, MP3 which are the constant current sources within the oscillation circuit, can be fixed regardless of the oscillation frequency.
Inventors:
NISHIKAWA KAZUHIKO
ENOI TAKAHIRO
WATANABE SEIJI
ENOI TAKAHIRO
WATANABE SEIJI
Application Number:
JP2004008334A
Publication Date:
August 26, 2004
Filing Date:
January 15, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03K3/354; H03K3/02; H03K3/0231; (IPC1-7): H03K3/354; H03K3/02; H03K3/0231
Attorney, Agent or Firm:
Kenichi Hayase