PROBLEM TO BE SOLVED: To provide a sawtooth wave oscillation circuit provided with a function of revising a kind of a packet used depending on a reception state of data.;SOLUTION: The sawtooth wave oscillation circuit is provided with: a waveform generating circuit that generates a vertical deflection purpose sawtooth wave; an automatic gain control circuit that converges the amplitude of the sawtooth wave to a target value; an oscillation current generating circuit; an amplitude compensation circuit that compensates the amplitude of the sawtooth wave; a constant current that detects a period from the generation of an own reset pulse to input of a vertical synchronizing signal and forcibly charges/discharges an automatic gain controlling capacitor from the generation of the own reset pulse to the input of the vertical synchronizing signal within one vertical synchronizing signal; and an own reset detection circuit that shuts off a sampling pulse output to activate the amplitude compensation circuit of the sawtooth wave oscillation circuit from the generation of the own reset pulse to the input of the vertical synchronizing signal.;COPYRIGHT: (C)2003,JPO
展开▼
