DETECTION DEVICE FOR DETECTING OSCILLATOR

Abstract

A detection device for detecting an oscillator is provided. The detection device includes an oscillator control circuit, a frequency-decreasing circuit and a display circuit. The oscillator control circuit is used for outputting the oscillator signal of the oscillator. The frequency-decreasing circuit is connected to the output of the oscillator control circuit and has a capacitor suitable for charging and discharging and a resistor, which can adjust the time constant of the oscillator signal. The display circuit is connected to the frequency-decreasing circuit for showing the output signal of the frequency-decreasing circuit. The detection device can decide whether the oscillator is normal or broken by observing a component of the display circuit, for example, the twinkling of a light emitting diode of the display circuit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a flow diagram of a conventional method of measuring a quartz oscillator.

FIG. 2 is a block diagram showing the circuit of a detection device according to one embodiment of the present invention.

FIG. 3A is a circuit diagram of an oscillator control circuit according to one embodiment of the present invention.

FIG. 3B is a circuit diagram of a frequency-decreasing circuit according to one embodiment of the present invention.

FIG. 3C is a circuit diagram of a display circuit according to one embodiment of the present invention.

Claims

1. A detection device for detecting an oscillator, comprising: an oscillator control circuit for outputting an oscillation signal of the oscillator;a frequency-decreasing circuit, connected to the output of the oscillator control circuit, wherein the frequency-decreasing circuit has a capacitor suitable for charging and discharging and a resistor both for adjusting the time constant of the oscillation signal; anda display circuit, connected to the frequency-decreasing circuit for displaying the output signal of the frequency-decreasing circuit.

2. The detection device of claim 1, wherein the oscillator control circuit has a NOR gate, and one of the input terminals of the NOR gate is connected to the oscillator and the other of the input terminals of the NOR gate is connected to a reference voltage source.

3. The detection device of claim 2, further comprising a switch connected between the reference voltage source and a ground terminal.

4. The detection device of claim 1, wherein the frequency-decreasing circuit has a first NOR gate and a second NOR gate, the capacitor is connected between the output terminal of the first NOR gate and the input terminal of the second NOR gate, and the resistor serially connects a reference voltage source to the capacitor.

5. The detection device of claim 4, wherein the output terminal of the second NOR gate is feedback-connected to one of the input terminal of the first NOR gate, and the other input terminal of the first NOR gate is connected to the output of the oscillator control circuit.

6. The detection device of claim 1, wherein the frequency-decreasing circuit further comprises a protection device serially connected between the capacitor and the reference voltage source.

7. The detection device of claim 6, wherein the protection device is a diode.

8. The detection device of claim 1, further comprising a frequency division circuit connected between the display unit and the frequency-decreasing circuit.

9. The detection device of claim 8, wherein the display circuit has a light emitting diode, and the cathode of the light emitting diode is connected to the output of the frequency division circuit and the anode of the light emitting diode is connected to a reference voltage source.

10. The detection device of claim 1, further comprising a power converter connected to the oscillator control circuit, the frequency-decreasing circuit and the display circuit for outputting a reference voltage.