Delay ratio adjusting circuit, delayed pulse generation...

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

Reexamination Certificate

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Details

C327S149000, C327S156000, C327S147000

Reexamination Certificate

active

07486120

ABSTRACT:
Object To provide a highly accurate and stable pulse width modulation (PWM) pulse signal generation device compatible with high resolution images without increasing a basic frequency of an external oscillation circuit.Solving Means A PWM pulse signal generation device includes a first PLL control circuit410,a ring oscillator420in which a plurality of basic delay elements are serially connected, and a delayed pulse generation circuit constituted by a delay ratio adjusting circuit330and a delay circuit350. The delay circuit350is formed by setting one adjustment delay element having a delay ratio R that is adjusted by the delay ratio adjusting circuit330at a first stage and a plurality of serially connecting basic delay elements. An output pulse signal from each delay element of the ring oscillator420and an output pulse signal from each delay element of the delay circuit350having a delay amount corresponding to the delay ratio are superimposed to perform pulse width modulation, whereby output pulses having various pulse widths can be generated.

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