The invention discloses a fast oscillation starting type programmable
crystal oscillator circuit with low
power consumption, and relates to the technical field of integrated circuits. The fast oscillation starting type programmable
crystal oscillator circuit comprises: an independent
current source is connected with a current
control circuit, the current
control circuit is connected with an amplifying circuit, a first output end of a
crystal oscillator is connected with an input end of the amplifying circuit, a second output end of the
crystal oscillator is connected with the output end of theamplifying circuit, the
crystal oscillator is connected with a first
comparator, the first
comparator is connected with a second
comparator, the second comparator is connected with a level conversioncircuit, the level conversion circuit is connected with a first
inverter, the first
inverter is connected with a counter and a
AND gate, the counter is connected with a logic digital circuit, the counter is connected with the
AND gate, the
AND gate is connected with the second
inverter, the second inverter outputs a
signal, and the logic digital circuit is connected with the current
control circuit. The fast oscillation starting type programmable
crystal oscillator circuit disclosed by the invention has the advantages that when the amplitude of oscillation of the crystal oscillator is relatively large, some switches are turned off, continuous oscillation is maintained, fast oscillation starting is achieved by
high current, and low current and low
power consumption are achieved after the oscillation starting.