RAMP GENERATOR AND RAMP SIGNAL GENERATING METHOD THEREOF

摘要

A ramp generator and a ramp signal generating method thereof are provided to generate a ramp signal of a proper index function even if the characteristic change of the detector occurs by calibrating inclination and curvature of the ramp signal in real time using a calibration circuit. A ramp generator(20) comprises a ramp signal generating circuit(100), and a calibration circuit(200). The ramp signal generating circuit generates a ramp signal which increases as an index function. The ramp signal generating circuit receives the ramp signal and calibrates inclination and curvature of the ramp signal in real time. The calibration circuit calibrates the ramp signal by comparing voltage differences between the ramp signal and a target ramp signal. The ramp signal generating circuit includes an OP amplifier, a resistor(R), a capacitor(C), a feedback resistor(Rf), and a variable resistor(Rv). A switch(Sw) is placed between an inversion input end of the OP amplifier and an output end of the OP amplifier.