| US 7,612,590 B2 | ||
| Oscillating apparatus | ||
| Hiroki Kimura, Tokyo (Japan); and Yuichi Miyaji, Tokyo (Japan) | ||
| Assigned to Advantest Corporation, Tokyo (Japan) | ||
| Filed on Oct. 24, 2008, as Appl. No. 12/257,401. | ||
| Application 12/257401 is a division of application No. 11/776550, filed on Jul. 11, 2007. | ||
| Application 11/776550 is a continuation of application No. PCT/JP2006/305591, filed on Mar. 20, 2006. | ||
| Claims priority of application No. 2005-084575 (JP), filed on Mar. 23, 2005. | ||
| Prior Publication US 2009/0079480 A1, Mar. 26, 2009 | ||
| Int. Cl. H03L 7/06 (2006.01) | ||
| U.S. Cl. 327—156 [331/17] | 3 Claims |
| 1. An oscillating apparatus comprising:
an integration circuit that outputs a control signal based on an integration value of two inputted voltage values;
an oscillator that outputs an oscillation signal of a frequency that is based on the control signal;
a phase comparator that outputs a phase difference signal of a pulse width that is in accordance with a phase difference between
the oscillation signal and the reference signal, by comparing the oscillation signal with a reference signal of a predetermined
frequency;
a controlling circuit that controls the two inputted voltage values based on the phase difference signal, so as to approximate
a phase difference between the oscillation signal and the reference signal to a predetermined reference phase difference;
and
a voltage stabilizing circuit that defines the two inputted voltage values both based on a predetermined reference voltage.
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