Patent ID: 8432958

Claim:
An apparatus for measuring a jitter transfer characteristic, the apparatus comprising: a modulation signal generator which generates a modulation signal including a plurality of sinusoidal wave components having known amplitudes and different frequencies; a jitter generator which receives the modulation signal from the modulation signal generator and outputs a clock signal phase-modulated by the modulation signal; a data signal generator which generates an input data signal synchronized with the clock signal and provides the input data signal to a device under test; a clock recovery unit which receives a result data signal output from the device under test receiving the input data signal and recovers a clock signal component included in the result data signal; a phase detector which receives the clock signal component from the clock recovery unit and detects the phase of the clock signal component and outputs a signal indicating phase change; a signal amplitude detector which detects each of the amplitudes of the plurality of sinusoidal wave components included in the signal indicating the phase change; and an operation processor which calculates a ratio of each of the amplitudes of the sinusoidal wave components detected by the signal amplitude detector and each of the known amplitudes of the sinusoidal wave components, respectively, wherein the signal amplitude detector comprises: a plurality of filters each extracting each of the plurality of sinusoidal wave components included in the signal indicating the phase change; and a plurality of detectors each detecting each of the plurality of sinusoidal wave components extracted by each of the plurality of filters and calculating each of the amplitudes of the plurality of sinusoidal wave components.