Patent ID: 6480060
Filing Date: 2002-11-12
Classification: H04L

Abstract:
A FSK signal demodulating integration-discharge circuit comprising:a converter for converting a FSK signal into a rectangular-wave signal; a first integrating capacitor for charging the rectangular-wave signal therein so that charging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to an ON/OFF condition of a first transistor that is turned ON/OFF due to said rectangular-wave signal, said first integrating capacitor for discharging the rectangular-wave signal therefrom so that discharging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to the ON/OFF condition of said first transistor that is turned ON/OFF due to said rectangular-wave signal; a first holding capacitor for charging the charged voltage of said first integrating capacitor therein so that charging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to an ON/OFF condition of a second transistor that is turned ON/OFF due to said rectangular-wave signal, said first holding capacitor for discharging the charged voltage of said first integrating capacitor therefrom so that discharging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to the ON/OFF condition of said second transistor that is turned ON/OFF due to said rectangular-wave signal; an inverter for outputting an inversion rectangular-wave signal while inverting a phase of said rectangular-wave signal; a second integrating capacitor for charging the rectangular-wave signal therein so that charging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to an ON/OFF condition of a third transistor that is turned ON/OFF due to said rectangular-wave signal, said second integrating capacitor for discharging the rectangular-wave signal therefrom so that discharging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to the ON/OFF condition of said third transistor that is turned ON/OFF due to said rectangular-wave signal; a second holding capacitor for charging the charged voltage of said integrating capacitor therein so that charging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to an ON/OFF condition of a fourth transistor that is turned ON/OFF due to said rectangular-wave signal, said second holding capacitor for discharging the charged voltage of said second integrating capacitor therefrom so that discharging executes corresponding to a portion of positive voltage or negative voltage of said rectangular-wave signal according to the ON/OFF condition of said fourth transistor that is turned ON/OFF due to said rectangular-wave signal; and an output device for outputting a voltage which is subjected to holding by said first or second holding capacitor.