Patent ID: 7375566

Claim:
A clock signal generator for producing a stable clock signal, comprising: a power supply; a quartz crystal multivibrator circuit providing a sine wave signal; and a pulse-shaping circuit comprising a trigger to shape the sine wave signal to a rectangular wave, the trigger comprising a synchronising signal input terminal connected to the quartz crystal multivibrator, a first terminal for the rectangular clock signal output, a second terminal inverting to the first terminal, and a trigger terminal connected to the second terminal and connected to the power supply, wherein the trigger is a D trigger, the D trigger comprises a VCC terminal, a GND terminal connected to ground, a CP terminal serving as the synchronising signal input terminal, a Q terminal serving as the first output end, a Q′ terminal serving as the second output end, and a D terminal serving as the trigger terminal, and wherein the pulse-shaping circuit further comprises a first capacitor and a second capacitor, wherein the first capacitor is connected between the CP terminal and ground, the second capacitor is connected between the D terminal and ground, and capacitances of the first and second capacitors can be changed to adjust a frequency of the clock signal, the D terminal connected to the power supply via a resistor.