Phase control device, and pulse pattern generator and error detector using the phase control device

Abstract

An orthogonal modulator separates I and a Q channel signals that are orthogonal to each other from a first signal input as a local signal, provides the I and Q channel signals with DC voltages, respectively, and outputs a second signal with a desired phase delay with respect to the first signal in response to the DC voltages. A phase comparator detects a phase difference between the first and second signals. A setting unit sets the desired phase delay. A control unit controls the DC voltages supplied to the I and Q channel signals of the orthogonal modulator to make an output value corresponding to the phase difference detected by the phase comparator equal to a value corresponding to the desired phase delay set by the setting unit, so that the DC voltages Vi and Vq for the I and Q channel signals are satisfied with Vi = cos and Vq = sin ., respectively.

Description

Phase controller device, and pulse pattern generator and error detector using the phase controller device technical field The present invention relates to a phase controller device, and a pulse pattern generator and an error detector using the same, and, more particularly, to a phase controller device which imparts a desired delay by using a quadrature modulator, Among them, not being affected by errors in the quadrature modulator even when the frequency of the signal changes to a wide band; and a pulse pattern generator and an error detector using the phase controller device. Background technique For example, in a measurement system for a data signal using a pulse pattern generator and an error detector, a phase controller device that imparts a desired delay to a clock signal is used. As a delay device that imparts a desired delay to a signal, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-163608, there has hitherto been known a trombone-shaped...

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Problems solved by technology

Since each error of the quadrature modulator shows frequency dependence, it is very difficult to deal with the error according to the technique disclosed in US2004 / 0250192A1 when the frequency of the signal to be controlled varies in a wide range as described above

Therefore, when implementing a pulse pattern generator and an error detector using a quadrature modulator as a phase controller device, it is difficult to implement them separately with high accuracy

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