Analog electronic timepiece
AssigneeSii Semiconductor Corporation
InventorsMakoto Mitani, Kotaro Watanabe
Life of this patent
Estimating the term…
Abstract
To provide an analog electronic timepiece which prevents a crystal oscillation circuit from malfunctioning even if a battery voltage is lowered at motor loading. An analog electronic timepiece is equipped with a crystal vibrator, an oscillation circuit, a frequency division circuit, a constant voltage circuit, an output control circuit, and a motor. The analog electronic timepiece is configured in such a manner that the constant voltage circuit has a voltage holding circuit connected between a gate of an output transistor and a power supply terminal, and the oscillation circuit and the frequency division circuit are operated with a constant voltage generated by the constant voltage circuit as a power supply.
Claims4
An analog electronic timepiece, comprising:
- a crystal vibrator;
- an oscillation circuit;
- a frequency division circuit;
- a constant voltage circuit;
- an output control circuit;
- and
- a motor,
- said oscillation circuit and said frequency division circuit being operated with a constant voltage generated by the constant voltage circuit as a power supply, and
- said constant voltage circuit including:
- an output transistor connected between an output terminal and a power supply terminal,
- a voltage division circuit which is connected between the output terminal and a ground terminal and divides an output voltage of the output terminal to output a feedback voltage,
- a reference voltage circuit which outputs a reference voltage,
- a differential amplifier circuit which controls a voltage of a gate of the output transistor, based on the reference voltage and the feedback voltage, and
- a first voltage holding circuit connected between the gate of the output transistor and the power supply terminal.
Dependencies are inferred from the claim text.