Phase synchronization circuit and electronic apparatus
First Claim
1. A phase synchronization circuit comprising:
- an oscillation unit for outputting an output oscillation signal with a predetermined frequency based on an oscillation control signal;
a phase comparison unit for comparing phases between the output oscillation signal outputted from the oscillation unit and an input signal inputted from the outside;
a loop filter unit;
a drive unit for generating a drive signal based on a signal indicative of a phase comparison result outputted from the phase comparison unit, and driving the loop filter unit by the drive signal; and
an oscillation control signal generation unit for generating the oscillation control signal based on a loop filter output signal outputted from the loop filter unit so that the phase of the output oscillation signal synchronizes with the phase of the input signal; and
a gain characteristic information obtaining unit for obtaining gain characteristic information which specifies an input signal-oscillation frequency conversion gain characteristic of the oscillation unit at the time of actual operation and for storing the gain characteristic information, the gain characteristic information being obtained by comparing an actual oscillation frequency and first and second target frequencies to find a difference, while supplying, by using the target frequencies, a regulation signal of a predetermined magnitude and a compensation for oscillating the oscillation unit at each frequency as the oscillation control signal,wherein a compensation signal is generated based on the gain characteristic information obtained by the gain characteristic information obtaining unit at the time of the usual phase synchronizing operation, and the drive unit is controlled by the compensation signal so that a product of the input signal-oscillation frequency conversion gain at the time of actual operation and the drive signal with which the drive unit drives the loop filter unit is constant.
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Abstract
A phase synchronization circuit and an electronic apparatus equipped with the phase synchronization circuit are provided. The phase synchronization circuit includes an oscillation unit, a phase comparison unit, a loop unit, a drive unit, an oscillation control signal unit, and a gain characteristic information obtaining unit. In the phase synchronization unit, a compensation signal is generated based on the gain characteristic information obtained by the gain characteristic information obtaining unit at the time of the usual phase synchronizing operation, and the drive unit is controlled by the compensation signal so that a product of the input signal-oscillation frequency conversion gain at the time of actual operation and the drive signal with which the drive unit drives the loop filter unit is constant.
14 Citations
14 Claims
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1. A phase synchronization circuit comprising:
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an oscillation unit for outputting an output oscillation signal with a predetermined frequency based on an oscillation control signal; a phase comparison unit for comparing phases between the output oscillation signal outputted from the oscillation unit and an input signal inputted from the outside; a loop filter unit; a drive unit for generating a drive signal based on a signal indicative of a phase comparison result outputted from the phase comparison unit, and driving the loop filter unit by the drive signal; and an oscillation control signal generation unit for generating the oscillation control signal based on a loop filter output signal outputted from the loop filter unit so that the phase of the output oscillation signal synchronizes with the phase of the input signal; and a gain characteristic information obtaining unit for obtaining gain characteristic information which specifies an input signal-oscillation frequency conversion gain characteristic of the oscillation unit at the time of actual operation and for storing the gain characteristic information, the gain characteristic information being obtained by comparing an actual oscillation frequency and first and second target frequencies to find a difference, while supplying, by using the target frequencies, a regulation signal of a predetermined magnitude and a compensation for oscillating the oscillation unit at each frequency as the oscillation control signal, wherein a compensation signal is generated based on the gain characteristic information obtained by the gain characteristic information obtaining unit at the time of the usual phase synchronizing operation, and the drive unit is controlled by the compensation signal so that a product of the input signal-oscillation frequency conversion gain at the time of actual operation and the drive signal with which the drive unit drives the loop filter unit is constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic apparatus comprising:
a phase synchronization circuit which includes; an oscillation unit for outputting an output oscillation signal with a predetermined frequency based on an oscillation control signal; a phase comparison unit for comparing phases between the output oscillation signal outputted from the oscillation unit and an input signal inputted from the outside; a loop filter unit; a drive unit for generating a drive signal based on a signal indicative of a phase comparison result outputted from the phase comparison unit, and driving the loop filter unit with the drive signal; an oscillation control signal generation unit for generating the oscillation control signal based on a loop filter output signal outputted from the loop filter unit so that the phase of the output oscillation signal may synchronize with the phase of the input signal; and a gain characteristic information obtaining unit for obtaining gain characteristic information which specifies an input signal-oscillation frequency-conversion gain characteristic of the oscillation unit at the time of actual operation and for storing the gain characteristic information, the gain characteristic information being obtained by comparing an actual oscillation frequency and first and second target frequencies to find a difference, while supplying, by using the target frequencies, a regulation signal of a predetermined magnitude and a compensation for oscillating the oscillation unit at each frequency as the oscillation control signal, wherein a compensation signal is generated based on the gain characteristic information obtained by the gain characteristic information obtaining unit at the time of the usual phase synchronizing operation, and the drive unit is controlled by the compensation signal so that a product of the input signal-oscillation frequency conversion gain at the time of actual operation and the drive signal with which the drive unit drives the loop filter unit is constant.
Specification