Phase controlling apparatus, phase-control printed board, and controlling method

A phase controlling apparatus comprising:na first delay line with delay units adding a delay amount to a phase of a signal, the first delay line over which, when an input of an input signal is accepted, a delay amount is added by each of the delay units to a phase of the input signal and a delay signal for each input signal of the delay units is output; anda DLL circuit includinga second delay line with delay units, the second delay line over which, when an input of an external signal that can be externally switched to a signal different in frequency, a delay amount is added by each of the delay units to a phase of the external signal the external signal being a different signal from the input signal;a phase comparator that compares a phase of a delay signal delayed by all of the delay units of the second delay line and a phase of the external signal to which no delay amount is added on the second delay line to output a phase difference; anda delay-unit controlling circuit that inputs, to each of the delay units of the first delay line and the delay units of the second delay line, a control voltage value that is a value for synchronizing the delay signal to be compared by the phase comparator with the external signal and is generated from the phase difference output from the phase comparator.

A printed board on which a phase controlling apparatus is mounted, the phase controlling apparatus comprising:na first delay line with delay units adding a delay amount to a phase of a signal, the first delay line over which, when an input of an input signal is accepted, a delay amount is added by each of the delay units to a phase of the input signal and a delay signal for each input signal of the delay units is output; anda DLL circuit includinga second delay line with delay units, the second delay line over which, when an input of an external signal that can be externally switched to a signal different in frequency, a delay amount is added by each of the delay units to a phase of the external signal the external signal being a different signal from the input signal;a phase comparator that compares a phase of a delay signal delayed by all of the delay units of the second delay line and a phase of the external signal to which no delay amount is added on the second delay line to output a phase difference; anda delay-unit controlling circuit that inputs, to each of the delay units of the first delay line and the delay units of the second delay line, a control voltage value that is a value for synchronizing the delay signal to be compared by the phase comparator with the external signal and is generated from the phase difference output from the phase comparator.

A phase controlling method comprising:nin response to an input signal, adding a delay amount to a phase of the input signal with first delay units and outputting a delay signal for each input signal of the first delay units;in a DLL circuit, in response to an external signal that is a different signal from the input signal and can be externally switched to a signal different in frequency, adding a delay amount to a phase of the external signal with second delay units;in the DLL circuit, comparing a phase of a delay signal delayed by all of the delay units at the adding with second delay units, with a phase of the external signal to which no delay amount is added; andin the DLL circuit, inputting, to each of the first and second delay units, a control voltage value that is a value for synchronizing with the external signal the delay signal to be compared at the comparing and is generated from a phase difference obtained by the comparing.