DRIVE CIRCUIT, VIBRATION DEVICE, ELECTRONIC APPARATUS, AND MOBILE ENTITY

• Main Author: SATO HIDEKI
• Format: Patent
• Language: English; Japanese
• Published: 29.09.2016
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; GENERATION OF NOISE BY SUCH CIRCUITS; GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

PROBLEM TO BE SOLVED: To provide a drive circuit with which it is possible to make a startup time shorter than before.SOLUTION: A drive circuit 20 includes: a circuit 21 for feedback oscillation configuring a feedback oscillation circuit by being connected to a vibrator 100 and provided with a high-pass filter 211; an oscillation circuit 22 provided with a third node N3 for outputting a cyclic signal; and a control circuit 23 for controlling whether or not to supply the cyclic signal outputted by the oscillation circuit 22 to the circuit 21 for feedback oscillation while the feedback oscillation circuit is operating, and exercising control so as to break electrical continuity between a first node N1 that is the output node of the high-pass filter 211 and a grounded second node N2 when supplying the cyclic signal to the circuit 21 for feedback oscillation, and to establish electrical continuity between the first node N1 and the second node N2 when not supplying the cyclic signal to the circuit 21.SELECTED DRAWING: Figure 7 【課題】従来よりも起動時間を短くすることが可能な駆動回路を提供すること。【解決手段】駆動回路２０は、振動子１００に接続されることで帰還発振回路を構成し、かつ、ハイパスフィルター２１１を備えている帰還発振用回路２１と、周期信号を出力する第３ノードＮ３を備えている発振回路２２と、帰還発振回路が動作している状態で帰還発振用回路２１に発振回路２２が出力する周期信号を供給するか否かを制御し、かつ、帰還発振用回路２１に当該周期信号を供給する時にハイパスフィルター２１１の出力ノードである第１ノードＮ１と接地されている第２ノードＮ２との間を非導通の状態にし、帰還発振用回路２１に当該周期信号を供給しない時に第１ノードＮ１と第２ノードＮ２との間を導通の状態にするように制御する制御回路２３と、を含む。【選択図】図７