Patent ID: 7443253
Filing Date: 2008-10-28
Classification: G04D,H03K

Abstract:
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 an 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, the frequency-decreasing circuit has a first NOR gate and a second NOR gate, the capacitor is connected between an output terminal of the first NOR gate and an input terminal of the second NOR gate, and the resistor serially connects a reference voltage source to the capacitor; and a display circuit, connected to the frequency-decreasing circuit for displaying an output signal of the frequency-decreasing circuit.