1. An apparatus for generating an output signal having a particular frequency, comprising:
an oscillator operable to generate an output signal associated with an output frequency;
a first tuning module operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the first tuning module is operable to induce changes in the output frequency of a particular magnitude within a first amount of time;
a second tuning module operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the second tuning module is operable to induce changes in the output frequency of the particular magnitude within a second amount of time, wherein the second amount of time is greater than the first amount of time;
a frequency divider operable to:
receive information indicating a divisor associated with a requested frequency;
generate a divided signal, wherein the divided signal is associated with a frequency equal to the output frequency divided by the divisor; and
a selector operable to couple at least a selected one of the first tuning module and the second tuning module to the oscillator based, at least in part, on a difference between the divided signal and a reference signal;
wherein the first tuning module comprises:
a first counter operable to count a quantity of edges in the divided signal;
a second counter operable to count a quantity of edges in a reference signal;
a comparator operable to compare a first count output by the first counter to a second count output by the second counter; and
a trigger element operable to store a first output of the comparator; and
wherein the first tuning module is operable to:
increase the output frequency associated with the output signal if the first count is less than the second count; and
decrease the output frequency associated with the output signal if the first count is greater than the second count; and
wherein the selector is operable to:
couple the second tuning module to the oscillator if the first count is equal to the second count; and
couple the second tuning module to the oscillator based, at least in part, on the stored first output and a second output of the comparator.
2. The apparatus of claim 1, wherein:
the first counter is operable to count a quantity of edges in the divided signal by counting a quantity of rising edges in the divided signal; and
the second counter is operable to count a quantity of edges in the reference signal by counting a quantity of rising edges in the reference signal.
3. The apparatus of claim 1, wherein:
the first counter is operable to count a quantity of edges in the divided signal by counting a quantity of falling edges in the divided signal; and
the second counter is operable to count a quantity of edges in the reference signal by counting a quantity of falling edges in the reference signal.
4. The apparatus of claim 1, wherein the comparator is further operable to generate:
a mode output indicating a direction of a count;
a count change output indicating whether the count should be adjusted; and wherein the trigger element is operable to detect a transition in the mode output from a first level to a second level, and wherein the selector is operable to couple the selected module to the oscillator based, at least in part, on the transition in the mode output.
5. The apparatus of claim 4, further comprising:
a first transistor;
a second transistor;
a plurality of capacitive paths, each capacitive path associated with a capacitance;
a plurality of switches, each of the switches operable to selectively couple the first transistor to the second transistor through a particular capacitive path; and
a third counter operable to count a number times the comparator outputs the count change output at a particular level, and wherein the first control module is operable to configure the plurality of switches to couple the first transistor to the second transistor through one or more of the capacitive paths.
6. The apparatus of claim 1, wherein the oscillator comprises a variable capacitor and wherein the second tuning module is operable, when the second tuning module is coupled to the oscillator, to induce changes in the output frequency by adjusting a capacitance associated with the variable capacitor.
7. The apparatus of claim 6, wherein the second tuning module comprises:
a phase frequency detector;
a charge pump; and
a loop filter.
8. The apparatus of claim 1, wherein the first tuning module is operable to induce a change of a particular magnitude in the output frequency within a first period of time and the second tuning module is operable to induce the same change within a second period of time.
9. A method for generating an output signal having a particular frequency, comprising:
receiving information indicating a divisor associated with a requested frequency;
generating, at an oscillator, an output signal, wherein the output signal is associated with an output frequency; and
generating a divided signal, wherein the divided signal is associated with a frequency equal to the output frequency divided by a divisor;
selectively coupling at least one of a first tuning module and a second tuning module to the oscillator based, at least in part, on a difference between the divided signal and a reference signal, wherein:
the first tuning module is operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the first tuning module is operable to induce changes in the output frequency of a particular magnitude within a first amount of time;
the second tuning module is operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the second tuning module is operable to induce changes in the output frequency of the particular magnitude within a second amount of time, wherein the second amount of time is greater than the first amount of time;
counting, with a first counter, a quantity of edges in the divided signal;
counting, with a second counter, a quantity of edges in a reference signal;
comparing, with a comparator, a first count output by the first counter to a second count output by the second counter;
increasing a capacitance associated with the oscillator if the first count is greater than the second count;
decreasing a capacitance associated with the oscillator if the second count is greater than the first count; and
storing a first output of the comparator;
wherein selectively coupling at least one of the first tuning module and the second tuning module to the oscillator comprises, at least one of:
coupling the second tuning module to the oscillator if the first count is equal to the second count; and
selectively coupling at least one of the first tuning module and the second tuning module to the oscillator based, at least in part, on the stored first output and a second output of the comparator.
10. The method of claim 9, wherein:
counting the quantity of edges in the divided signal comprises counting a quantity of rising edges in the divided signal; and
counting the quantity of edges in the reference signal comprises counting a quantity of rising edges in the reference signal.
11. The method of claim 9, wherein:
counting the quantity of edges in the divided signal comprises counting a quantity of falling edges in the divided signal; and
counting the quantity of edges in the reference signal comprises counting a quantity of falling edges in the reference signal.
12. The method of claim 9, further comprising generating based, at least in part, on a comparison of the first count and the second count:
a count change output indicating a change in a magnitude of an attempt count;
a mode output indicating a direction of the change in magnitude of the attempt count; and wherein selectively coupling at least one of the first tuning module and the second tuning module to the oscillator comprises selectively coupling at least one of the first tuning module and the second tuning module to the oscillator based, at least in part, on a transition of the mode output from a first level to a second level.
13. The method of claim 12, further comprising:
counting, with a third counter, a number of times the comparator outputs the count change output at a particular level,
configuring, based on the output of the third counter, one or more of a plurality of switches, wherein each of the plurality of switches is operable to selectively couple a first transistor to a second transistor through a capacitive path having a particular capacitance.
14. The method of claim 9, further comprising inducing changes in the output frequency, when the second tuning module is coupled to the oscillator, by adjusting a capacitance associated with a variable capacitor in the second tuning module.
15. An apparatus for generating an output signal having a particular frequency, comprising:
an oscillator operable to generate an output signal associated with an output frequency;
a first tuning module operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the first tuning module is operable to induce changes in the output frequency of a particular magnitude within a first amount of time;
a second tuning module operable, when coupled to the oscillator, to induce changes in the output frequency, wherein the second tuning module is operable to induce changes in the output frequency of the particular magnitude within a second amount of time, wherein the second amount of time is greater than the first amount of time;
a frequency divider operable to:
receive information indicating a divisor associated with a requested frequency;
generate a divided signal, wherein the divided signal is associated with a frequency equal to the output frequency divided by the divisor; and
a selector operable to couple at least a selected one of the first tuning module and the second tuning module to the oscillator based, at least in part, on a difference between the divided signal and a reference signals;
wherein the first tuning module comprises:
a comparator operable to compare a first count associated with a quantity of edges in the divided signal and a second count associated with a quantity of edges in a reference signal; and
a memory operable to store a first output of the comparator; and
wherein the selector is operable to couple the second tuning module to the oscillator based, at least in part, on the stored first output and a second output of the comparator.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A mobile kitchen comprising:
a housing disposed atop one or more wheel axles;
a plurality of appliances disposed within the housing, each appliance being heated by combustion of a distillate fuel;
one or more air channels disposed about each of the appliances, each air channel being adapted to substantially isolate excess heat from combustion of the distillate fuel from a workspace within the housing;
one or more first air blowers associated with the air channels, wherein the first air blowers are adapted to force air through the air channels such that the excess heat is vented to an exterior of the housing; and
one or more second air blowers coupled to the housing, wherein each second air blower is adapted to vent a predetermined volume of air from within the workspace at least once per minute.
2. The mobile kitchen of claim 1, wherein a first air channel is disposed about two or more of the appliances that are adjacent to one another.
3. The mobile kitchen of claim 1, wherein each of the air channels vents to an underside of the housing.
4. The mobile kitchen of claim 1, wherein each appliance includes an exhaust channel for products of combustion.
5. The mobile kitchen of claim 4, wherein at least one of the first air blowers draws air from an underside of the housing.
6. The mobile kitchen of claim 5, wherein each exhaust channel vents to an exterior of the housing on a side different from which the first air blowers draw air.
7. The mobile kitchen of claim 4, wherein the exhaust channel for at least one of the appliances vents to a top side of the housing.
8. The mobile kitchen of claim 4, wherein each exhaust channel comprises double-walls within the housing.
9. The mobile kitchen of claim 8, wherein a space between the double walls is cooled by air from one or more of the air channels.
10. The mobile kitchen of claim 1, wherein one of the first air blowers directs air into a liquid fuel burner adapted to heat one of the appliances.
11. The mobile kitchen of claim 1, wherein the one or more second air blowers comprise seven second air blowers.
12. The mobile kitchen of claim 1, further comprising a potable water reservoir coupled to at least one spigot.
13. The mobile kitchen of claim 1, wherein the predetermined volume of air is at least a volume of the workspace.
14. The mobile kitchen of claim 1, wherein the air channels attenuate noise created by combustion.
15. The mobile kitchen of claim 1, wherein one of the appliances comprises a convection oven.
16. The mobile kitchen of claim 1, wherein one of the appliances comprises a griddle.
17. The mobile kitchen of claim 1, wherein one of the appliances comprises a stock pot cooker.
18. The mobile kitchen of claim 1, wherein one of the appliances comprises a sanitation unit.
19. The mobile kitchen of claim 18, further comprising a grey water reservoir coupled to the sanitation unit.
20. The mobile kitchen of claim 1, further comprising a storage space having a base wall formed by a conveyor belt system.