Patent ID: 8115520
Filing Date: 2012-02-14
Classification: G01R,H03K,H04L

Abstract:
1. A driver circuit for outputting an output signal of a waveform corresponding to an input signal, the driver circuit comprising: a main driver which receives said input signal and outputs a first signal corresponding to said input signal; a sub driver which receives said input signal and outputs a differential signal formed of a second signal corresponding to said input signal and a third signal produced by inverting said input signal; a differentiating circuit including a resistor which is connected in parallel with respect to an incoming signal and a variable capacity condenser which is connected in serial with respect to the incoming signal, the differentiating circuit outputting a fourth signal produced by differentiating the second signal and a fifth signal produced by differentiating the third signal; and an addition unit which selectively outputs as said output signal either one of a high frequency emphasized signal produced by adding the first signal and the fourth signal and a low frequency emphasized signal produced by adding the first signal and the fifth signal.