| 摘要 |
PURPOSE:To generate an accurate waveform by a simple circuit by applying synchronization to triangle wave generators so as to generate triangle waves or sawtooth waves respectively whose phase differs by 180 deg.. CONSTITUTION:The 3rd oscillator 11 generates waveforms (g), (h), that is, two rectangulat wave signals whose time ratio is 50% and whose phase differs by 180 deg., the rectangular wave signal (g) is fed to the 1st oscillator 5a and the signal (h) is fed to the 2nd oscillator 5b respectively. The 1st and 2nd oscillators 5a, 5b generate sawtooth waves (j), (k) synchronized with the rectangular wave signals (g), (h) and are inputted to a non-inverting input terminal (+) of the 1st and 2nd comparators 6, 7. On the other hand, an error amplifier 4 compares a detection signal with a reference signal, amplifies the difference and inputs the result to an inverting input terminal (-) of the 1st and 2nd comparators 6, 7. The comparators 6, 7 compare the sawtooth waves (j), (k) with an output (i) of the error amplifier 4 and a signal having a pulse width in response to the output level of the error amplifier 4 is outputted.
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