Title:
AUTOMATIC TUNING CIRCUIT
Document Type and Number:
Japanese Patent JPH0563513
Kind Code:
A
Abstract:
PURPOSE: To ensure the tuning action.
CONSTITUTION: The tuning frequency of tuning circuits 32, 38 is changed before and after a specific frequency to implement fine adjustment tuning. A reception radio wave intensity is detected by an electric field strength detection circuit 70 and a forced driving circuit 120 supplies a prescribed current to a PIN diode 28 to attenuate an input signal forcibly. Thus, at the tuning action the change in the current to the PIN diode by an AGC control circuit 72 is not caused to attain accurate tuning action.
Inventors:
ISHII HISAO
Application Number:
JP22024091A
Publication Date:
March 12, 1993
Filing Date:
August 30, 1991
Export Citation:
Assignee:
SANYO ELECTRIC CO
International Classes:
H03J7/18; H04B1/16; (IPC1-7): H03J7/18
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)
Next Patent: TUNING DEVICE