1. A circuit, for restarting up a voltage-controlled oscillator (VCO), the circuit comprising:
a detection circuit, generating a detection signal by receiving an output signal from the VCO, a power down signal and an external signal;
a divider, generating a second reference signal by dividing the external signal;
a logic circuit, generating a restart up signal by logic operation on the detection signal and the second reference signal; and
a pulse generator, generating a trigger signal according to the restart up signal, wherein the trigger signal is provided to the VCO for triggering the VCO to leave a stable mode.
2. The circuit of claim 1, wherein the logic circuit is a circuit of a AND function.
3. The circuit of claim 1, wherein the frequency of the second reference signal is lower than or equal to the frequency of the output signal from the VCO.
4. The circuit of claim 1, wherein the detection circuit comprising:
an energy storing element, wherein a first end of the energy storing element is coupled to a ground voltage source and a second end of the energy storing element is coupled to a node;
a first switch, controlled by the power down signal, wherein a first end of the first switch is coupled to a power source and a second end of the first switch is coupled to the node, wherein the energy storing element is charged by the power source and the voltage level at the node is equal to the voltage level in response to the power down signal; and
a bi-stable trigger, wherein an input terminal of the bi-stable trigger is coupled to the node, the bi-stable trigger generating the detection signal in response to the voltage level at the node.
5. The circuit of claim 4, wherein the energy storing element is a capacitor.
6. The circuit of claim 4, wherein the detection circuit further comprising:
a one-shot generator, receiving the output signal of the VCO and generating a one-shot signal accordingly;
a resistor, wherein a first end of the resistor is connected to the power source and a second end of the resistor is coupled to the node;
a first current source, wherein a second end of the first current source is coupled to a ground voltage source; and
a second switch, controlled by the one-shot signal of the one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source.
7. The circuit of claim 4, wherein the detection circuit further comprising:
a first one-shot generator, receiving the output signal of the VCO and generating a first one-shot signal accordingly;
a first current source, a second end of the first current source is coupled to a ground voltage source;
a second switch, controlled by the first one-shot signal of the first one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source;
a second one-shot generator, receiving the external signal and generating a second one-shot signal accordingly;
a second current source, a first end of the second current source is coupled to a power source; and
a third switch, controlled by the second one-shot signal of the second one-shot generator, wherein a first end of the third switch is coupled to a second end of the second current source, and a second end of the third switch is coupled to the node.
8. The circuit of claim 4, wherein the detection circuit further comprising:
a divider, receiving the output signal of the VCO and generating a divided clock by dividing the output signal of the VCO by M, where M is an integer;
a first one-shot generator, receiving the divided clock of the divider and generating a first one-shot signal accordingly;
a first current source, wherein a second end of the first current source is coupled to a ground voltage source, and the first current source provides a current corresponding to M;
a second switch, controlled by the first one-shot signal of the first one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source;
a second one-shot generator, receiving the external signal and generating a second one-shot signal accordingly;
a second current source, a first end of the second current source is coupled to a power source; and
a third switch, controlled by the second one-shot signal of the second one-shot generator, wherein a first end of the third switch is coupled to a second end of the second current source, and a second end of the third switch is coupled to the node.
9. A circuit, for restarting up a voltage-controlled oscillator (VCO), the circuit comprising:
a detection circuit, generating a detection signal by receiving an output signal of the VCO, a power down signal and an external signal;
a logic circuit, generating a restart up signal by logic operation on the detection signal and a second reference signal, wherein a frequency of the second reference signal is lower than or equal to a frequency of the external signal; and
a one shot generator, generating a trigger signal according to the restart up signal, wherein the trigger signal is provided to the VCO for triggering the output signal of the VCO to leave a stable mode.
10. The circuit of claim 9, wherein the logic circuit is a circuit of a AND function.
11. The circuit of claim 9, wherein the detection circuit comprising:
an energy storing element, wherein a first end of the energy storing element is coupled to a ground voltage source and a second end of the energy storing element is coupled to a node;
a first switch, controlled by the power down signal, wherein a first end of the first switch is coupled to a power source and a second end of the first switch is coupled to the node, wherein the energy storing element is charged by the power source and the voltage level at the node is equal to the voltage level in response to the power down signal; and
a bi-stable trigger, wherein an input terminal of the bi-stable trigger is coupled to the node, the bi-stable trigger generating the detection signal in response to the voltage level at the node.
12. The circuit of claim 11, wherein the energy storing element is a capacitor.
13. The circuit of claim 11, wherein the detection circuit further comprising:
a one-shot generator, receiving the output signal of the VCO and generating a one-shot signal accordingly;
a resistor, wherein a first end of the resistor is connected to the power source and a second end of the resistor is coupled to the node;
a first current source, wherein a second end of the first current source is coupled to a ground voltage source; and
a second switch, controlled by the one-shot signal of the one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source.
14. The circuit of claim 11, wherein the detection circuit further comprising:
a first one-shot generator, receiving the output signal of the VCO and generating a first one-shot signal accordingly;
a first current source, a second end of the first current source is coupled to a ground voltage source;
a second switch, controlled by the first one-shot signal of the first one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source;
a second one-shot generator, receiving the external signal and generating a second one-shot signal accordingly;
a second current source, a first end of the second current source is coupled to a power source; and
a third switch, controlled by the second one-shot signal of the second one-shot generator, wherein a first end of the third switch is coupled to a second end of the second current source, and a second end of the third switch is coupled to the node.
15. The circuit of claim 11, wherein the detection circuit further comprising:
a divider, receiving the output signal of the VCO and generating a divided clock by dividing the output signal of the VCO by M, where M is an integer;
a first one-shot generator, receiving the divided clock of the divider and generating a first one-shot signal accordingly;
a first current source, a second end is coupled to a ground voltage source, the first current source provides a current corresponding to M;
a second switch, controlled by the first one-shot signal of the first one-shot generator, wherein a first end of the second switch is coupled to the node, and a second end of the second switch is coupled to a first end of the first current source;
a second one-shot generator, receiving the external signal and generating a second one-shot signal accordingly;
a second current source, a first end of the second current source is coupled to a power source; and
a third switch, controlled by the second one-shot signal of the second one-shot generator, wherein a first end of the third switch is coupled to a second end of the second current source, and a second end of the third switch is coupled to the node.
16. A method for restarting up a voltage-controlled oscillator (VCO), comprising:
generating a detection signal by receiving an output signal of a VCO, a power down signal and an external signal;
generating a second reference signal by dividing the external signal;
performing a logic operation on the detection signal and the second reference signal to generate a restart up signal; and
generating a trigger signal according to the restart up signal to trigger the output signal of the VCO to leave a stable mode.
17. The method for restarting up a VCO according to claim 16, wherein the detection signal is generated by
charging an input end of a bi-stable trigger to a power voltage level while receiving a power down signal after power on;
checking that an operation status of the VCO is in the stable mode or not,
if the operation status of the VCO is in the stable mode, the voltage on the input end of the bi-stable trigger is maintained at the power voltage level, and
if VCO is not in the stable mode, the voltage on the input end of the bi-stable trigger is discharged and approaching to the ground voltage level, wherein
if the voltage level on the input end of the bi-stable trigger is higher than a first threshold voltage of the bi-stable trigger, the detection signal is in a first logic status, and
if the voltage level on the input end of the bi-stable trigger is lower than a second threshold voltage of the bi-stable trigger, the detection signal is in a second logic status, wherein the first threshold voltage is higher than the second threshold voltage.
18. A method for restarting up a VCO, comprising:
generating a detection signal by receiving an output signal from a VCO, a power down signal and an external signal;
performing a logic operation on the detection signal and a second reference signal from external to generate a restart up signal, wherein a frequency of the second reference signal is lower than or equal to a frequency of the external signal; and
generating a trigger signal according to the restart up signal to trigger the output signal of the VCO to leave a stable mode.
19. The method for restarting up a VCO according to claim 18, wherein the detection signal is generated by
charging an input end of a bi-stable trigger to a power voltage level while receiving a power down signal after power on;
checking that an operation status of the VCO is in the stable mode or not,
if the operation status of the VCO is in the stable mode, the voltage on the input end of the bi-stable trigger is maintained at the power voltage level, and
if VCO is not in the stable mode, the voltage on the input end of the bi-stable trigger is discharged and approaching to the ground voltage level, wherein
if the voltage level on the input end of the bi-stable trigger is higher than a first threshold voltage of the bi-stable trigger, the detection signal is in a first logic status, and
if the voltage level on the input end of the bi-stable trigger is lower than a second threshold voltage of the bi-stable trigger, the detection signal is in a second logic status, wherein the first threshold voltage is higher than the second threshold voltage.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A radiation-curable hot melt ink composition comprising:
a colorant;
a polymerizable monomer; and
a photoinitiating system comprising 0.5-1.5% by weight of an aromatic ketone photoinitiator, 2-10% by weight of an amine synergist, 3-8% by weight of an alpha-cleavage type photoinitiator, and 0.5-1.5% by weight of a photosensitizer.
2. The radiation-curable hot melt ink composition of claim 1, wherein the polymerizable monomer is a multi-functional monomer.
3. The radiation-curable hot melt ink composition of claim 2, wherein the polymerizable monomer is an acrylate monomer.
4. The radiation-curable hot melt ink composition of claim 1, further comprising a diluent.
5. The radiation-curable hot melt ink composition of claim 4, wherein the diluent is a mono-functional or di-functional monomer.
6. The radiation-curable hot melt ink composition of claim 5, wherein the polymerizable monomer is a multi-functional monomer.
7. The radiation-curable hot melt ink composition of claim 6, wherein the polymerizable monomer is an acrylate monomer.
8. The radiation-curable hot melt ink composition of claim 1, wherein the radiation-curable hot melt ink composition has a viscosity ranging from about 1 centipoise to about 50 centipoise.
9. The radiation-curable hot melt ink composition of claim 1, further comprising a vehicle.
10. A radiation-curable liquid ink composition comprising:
a colorant;
a liquid polymerizable monomer; and
a photoinitiating system comprising 2-4% by weight of an aromatic ketone photoinitiator, 5-10% by weight of an amine synergist, 5-10% by weight of an alpha-cleavage type photoinitiator, and 2-4% by weight of a photosensitizer.
11. The radiation-curable liquid ink composition of claim 10, wherein the polymerizable monomer is a multi-functional monomer.
12. The radiation-curable liquid ink composition of claim 11, wherein the polymerizable monomer is an acrylate monomer.
13. The radiation-curable liquid ink composition of claim 10, further comprising a diluent.
14. The radiation-curable liquid ink composition of claim 13, wherein the diluent is a mono-functional or di-functional monomer.
15. The radiation-curable liquid ink composition of claim 14, wherein the polymerizable monomer is a multi-functional monomer.
16. The radiation-curable liquid ink composition of claim 15, wherein polymerizable monomer is an acrylate monomer.
17. The radiation-curable liquid ink composition of claim 10, wherein the radiation-curable hot melt ink composition has a viscosity ranging from about 1 centipoise to about 50 centipoise.
18. A printing method, comprising:
printing a radiation-curable hot melt ink composition on a substrate to form an image, the composition comprising a colorant; a polymerizable monomer; and a photoinitiating system comprising 0.5-1.5% by weight of an aromatic ketone photoinitiator, 2-10% by weight of an amine synergist, 3-8% by weight of an alpha-cleavage type photoinitiator, and 0.5-1.5% by weight of a photosensitizer; and
irradiating the image.
19. A printing method, comprising the steps of:
printing a radiation-curable liquid ink composition on a substrate to form an image, the composition comprising a colorant; a polymerizable monomer; and a photoinitiating system comprising 2-4% by weight of an aromatic ketone photoinitiator, 5-10% by weight of an amine synergist, 5-10% by weight of an alpha-cleavage type photoinitiator, and 2-4% by weight of a photosensitizer; and
irradiating the image.