Title:
SIGNAL LEVEL DETECTING CIRCUIT
Document Type and Number:
Japanese Patent JPH0621759
Kind Code:
A
Abstract:
PURPOSE: To increase the dynamic range of the detectable signal levels without providing a new external capacitor to the output terminal of a filter nor increasing the number of pins of an integrated circuit.
CONSTITUTION: The signal component which is extracted out of an input terminal of a buffer amplifier means OP1 that feeds the output back to the input side by a filter means 11 including the means OP1 is supplied to a rectifier means 12. Thus, the DC offset component emerging at the output of the OP1 is deleted by a capacitor C2 of a feedback loop. Therefore, it is possible to increase the dynamic range of the detectable signal levels without using any new external capacitor nor increasing the number of pins of an integrated circuit.
Inventors:
KATAKURA MASAYUKI
TSURUOKA TATSUYA
TSURUOKA TATSUYA
Application Number:
JP19600292A
Publication Date:
January 28, 1994
Filing Date:
June 30, 1992
Export Citation:
Assignee:
SONY CORP
International Classes:
H03D5/00; H03H11/12; (IPC1-7): H03H11/12; H03D5/00
Attorney, Agent or Firm:
Kei Tanabe
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