1. A method of cooling a computer server including a plurality of server modules, comprising:
maintaining a flow of air within a server module of the plurality of server modules to absorb heat from one or more heat generating devices of the server module;
directing the flow of air through an air-to-liquid heat exchanger of a liquid cooling system to transfer the absorbed heat to a coolant of the liquid cooling system, the air-to-liquid heat exchanger being positioned within the server module;
directing the coolant to a cold plate of the liquid cooling system, the cold plate being thermally coupled to a heat generating component of the server module; and
discharging heat from the coolant to a region outside the computer server.
2. The method of claim 1, wherein maintaining the flow of air within the server module includes keeping the server module substantially sealed such that the air remains substantially within the server module.
3. The method of claim 2, wherein the server module includes multiple server modules of the plurality of server modules, and discharging heat from the coolant includes removing heat from within each server module of the multiple server modules and transferring the heat to the region outside the computer server.
4. The method of claim 1, wherein discharging heat from the coolant includes transferring the heat to a medium outside the computer server.
5. The method of claim 1, wherein the cold plate is positioned upstream of the air-to-liquid heat exchanger such that the coolant passes through the cold plate before passing through the air-to-liquid heat exchanger.
6. The method of claim 1, wherein the cold plate is positioned downstream of the air-to-liquid heat exchanger such that the coolant passes through the air-to-liquid heat exchanger before passing through the cold plate.
7. A method of cooling a computer server, including a plurality of server modules, comprising:
circulating cooling air within a server module of the plurality of server modules to cool one or more heat generating components of the server module, the server module being substantially sealed to prevent flow of the cooling air outside the server module; and
transferring heat from the circulating cooling air to a liquid coolant passing through one or more air-to-liquid heat exchangers positioned within the server module.
8. The method of claim 7, wherein circulating the cooling air includes pushing the cooling air through at least one air-to-liquid heat exchanger of the one or more air-to-liquid heat exchangers using a fan positioned upstream of the at least one air-to-liquid heat exchanger.
9. The method of claim 7, wherein circulating the cooling air includes pulling the cooling air through at least one air-to-liquid heat exchanger of the one or more air-to-liquid heat exchangers using a fan positioned downstream of the at least one air-to-liquid heat exchanger.
10. The method of claim 7, further including discharging heat from the liquid coolant to a location outside the computer server.
11. The method of claim 7, further including cooling at least one heat generating component of the server module using a cold plate cooled by the liquid coolant.
12. The method of claim 11, wherein the cold plate is positioned downstream of at least one air-to-liquid heat exchanger of the one or more air-to-liquid heat exchangers such that the liquid coolant passes through the at least one air-to-liquid heat exchanger before passing through the cold plate.
13. The method of claim 7, further including circulating cooling air within a second server module of the plurality of server modules to cool one or more heat generating components of the second server module, the second server module being substantially sealed to prevent flow of the cooling air outside the server module.
14. The method of claim 13, further including transferring heat from the cooling air circulating in the second server module to a liquid coolant passing through one or more air-to-liquid heat exchangers positioned within the second server module.
15. The method of claim 13, further including one or more fans positioned within the second server module to circulate cooling air within the second server module.
16. A method of cooling a computer server including multiple server modules, comprising:
circulating cooling air within a server module of the multiple server modules to cool heat generating components of the server module, the server module being substantially sealed to prevent flow of the cooling air outside the server module; and
cooling the cooling air using an air-to-liquid heat exchanger positioned within the server module.
17. The method of claim 16, further including cooling one or more heat generating components of the server module using a liquid cooled cold plate fluidly coupled to the air-to-liquid heat exchanger.
18. The method of claim 17, further including circulating a liquid coolant through the cold plate and the air-to-liquid heat exchanger.
19. The method of claim 16, further including discharging heat from the air-to-liquid heat exchanger to a region outside the computer server.
20. The method of claim 16, further including one or more fans positioned within the server module to circulate the cooling air within the server module.
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 television tuner provided with a mixer for subjecting one of entered digital television signals and analog television signals to frequency conversion into an intermediate frequency band and an intermediate frequency tuning circuit so configured as to enable a tuning frequency to be switched within the intermediate frequency band and arranged at a stage immediately following the mixer, wherein the intermediate frequency tuning circuit is tuned to a first frequency substantially at a center of the intermediate frequency band when the digital television signals are entered into the mixer and tuned to a second frequency higher than the first frequency when the analog television signals are entered into the mixer,
wherein Q of the intermediate frequency tuning circuit is lowered when the digital television signals are entered into the mixer, and wherein the Q is raised and the tuning frequency is tuned substantially to a video intermediate frequency in the intermediate frequency band when the analog television signals are entered into the mixer,
the intermediate frequency tuning circuit has a parallel tuning circuit to be substantially tuned to the video intermediate frequency, a series circuit including a switch diode and capacitance elements, and a resistor connected in parallel to the capacitance elements,
the series circuit is connected to the parallel tuning circuit in parallel, and
the switch diode is turned on when the digital television signals are entered into the one of the mixer and the switch diode is turned off when the analog television signals are entered into the mixer.
2. The television tuner according to claim 1 wherein the television tuner has switching means provided at a stage following the intermediate frequency tuning circuit and an intermediate frequency circuit for digital signals and an intermediate frequency circuit for analog signals provided in parallel at a stage following the switching means, and wherein the digital television signals having undergone frequency conversion into the intermediate frequency band by the switching means are entered into the intermediate frequency circuit for digital signals and the analog television signals having undergone frequency conversion into the intermediate frequency band are entered into the intermediate frequency circuit for analog signals.
3. The television tuner according to claim 2, wherein switching signals to distinguish whether television signals entered into the mixer are the digital television signals or the analog television signals are applied to the switch diode and the switching means.