1. A concurrent dual-band receiver, comprising:
a front-end subsystem configured for supplying radio frequency signals in a first frequency band and a second frequency band outside of the first frequency band; and
a concurrent dual-band down-converter connected to the front-end subsystem and configured for simultaneously down-converting the radio frequency signals supplied by the front-end subsystem, comprising:
a dual-band frequency synthesizer configured for simultaneously generating first local oscillation signals having a first local oscillation frequency and second local oscillation signals having a second local oscillation frequency higher than the first local oscillation frequency;
a first down-converting circuit connected to the front-end subsystem and the dual-band frequency synthesizer, the first down-converting circuit being configured for receiving the first local oscillation signals and the radio frequency signals supplied by the front-end subsystem, mixing the radio frequency signals with the first local oscillation signals to down-convert the radio frequency signals to base band signals, and passing the down-converted signals from the first frequency band but blocking the down-converted signals from the second frequency band; and
a second down-converting circuit connected to the front-end subsystem and the dual-band frequency synthesizer, the second down-converting circuit being connected in parallel to the first down-converting circuit and configured for receiving the second local oscillation signals and the radio frequency signals supplied by the front-end subsystem, mixing the radio frequency signals with the second local oscillation signals to down-convert the radio frequency signals to base band signals, and passing the down-converted signals from the second frequency band but blocking the down-converted signals from the first frequency band.
2. The concurrent dual-band receiver of claim 1, wherein the first local oscillation signals comprise a first in-phase signal and a first quardrature signal, and the second local oscillation signals comprise a second in-phase signal and a second quardrature signal; the first and second down-converting circuits both comprising an in-phase channel and a quardrature channel parallel to the in-phase channel; the in-phase channel and the quardrature channel of the first down-converting circuit being configured for receiving the first in-phase signal and the first quardrature signal correspondingly; the in-phase channel and the quardrature channel of the second down-converting circuit being configured for receiving the second in-phase signal and the second quardrature signal correspondingly.
3. The concurrent dual-band receiver of claim 2, wherein the in-phase channel and the quardrature channel each comprises in series:
a mixer configured for mixing the radio frequency signals with the local oscillation signals to down-convert the radio frequency signals to base band signals;
a variable gain amplifier configured for amplifying the signals outputted by the mixer; and
a low pass filter configured for filtering out the down-converted signals from the first or second frequency band.
4. The concurrent dual-band receiver of claim 1, wherein the dual-band frequency synthesizer comprises a dual-band voltage controlled oscillator configured for simultaneously generating the first local oscillation signals and the second local oscillation signals.
5. The concurrent dual-band receiver of claim 1, wherein the front-end subsystem comprises in series:
a dual-band antenna configured for receiving radio frequency signals from the first and second frequency bands;
a dual-band filter configured for filtering out the radio frequency signals beyond the first and second frequency bands; and
a dual-band low noise amplifier configured for amplifying the radio frequency signals outputted by the dual-band filter.
6. A communication device comprising a concurrent dual-band receiver, a processor, a user interface and a radio frequency transmitter, wherein the concurrent dual-band receiver comprises:
a front-end subsystem configured for supplying radio frequency signals in a first frequency band and a second frequency band outside of the first frequency band; and
a concurrent dual-band down-converter connected to the front-end subsystem and configured for simultaneously down-converting the radio frequency signals supplied by the front-end subsystem, comprising:
a dual-band frequency synthesizer configured for simultaneously generating first local oscillation signals having a first local oscillation frequency and second local oscillation signals having a second local oscillation frequency higher than the first local oscillation frequency;
a first down-converting circuit connected to the front-end subsystem and the dual-band frequency synthesizer, the first down-converting circuit being configured for receiving the first local oscillation signals and the radio frequency signals supplied by the front-end subsystem, mixing the radio frequency signals with the first local oscillation signals to down-convert the radio frequency signals to base band signals, and passing the down-converted signals from the first frequency band but blocking the down-converted signals from the second frequency band; and
a second down-converting circuit connected to the front-end subsystem and the dual-band frequency synthesizer, the second down-converting circuit being parallel to the first down-converting circuit and configured for receiving the second local oscillation signals and the radio frequency signals supplied by the front-end subsystem, mixing the radio frequency signals with the second local oscillation signals to down-convert the radio frequency signals to base band signals, and passing the down-converted signals from the second frequency band but blocking the down-converted signals from the first frequency band.
7. The communication device of claim 6, wherein,
the processor is connected to the concurrent dual-band down-converter and configured for processing the down-converted signals outputted by the first and second down-converting circuits;
the user interface is configured for converting the signals processed by the processor to visible or audible information, and inputting electrical signals to the processor in response to the operations of the user; and
the transmitter is configured for converting the signals outputted from the processor to radio waves to communicate with a communication base station.
8. The communication device of claim 6, further comprising:
a plurality of analog-to-digital converters interconnected the processor and the concurrent dual-band down-converter and configured for converting the signals outputted by the concurrent dual-band down-converter to digital signals.
9. The communication device of claim 6, wherein the processor outputs the signals from at least one of the first and second frequency band to the user interface.
10. The communication device of claim 6, wherein the first local oscillation signals comprise a first in-phase signal and a first quardrature signal, and the second local oscillation signals comprise a second in-phase signal and a second quardrature signal; the first and second down-converting circuits both comprising an in-phase channel and a quardrature channel parallel to the in-phase channel; the in-phase channel and the quardrature channel of the first down-converting circuit being configured for receiving the first in-phase signal and the first quardrature signal correspondingly; the in-phase channel and the quardrature channel of the second down-converting circuit being configured for receiving the second in-phase signal and the second quardrature signal correspondingly.
11. The communication device of claim 10, wherein the in-phase channel and the quardrature channel each comprises in series:
a mixer configured for mixing the radio frequency signals with the local oscillation signals to down-convert the radio frequency signals to base band signals;
a variable gain amplifier configured for amplifying the signals outputted by the mixer; and
a low pass filter configured for filtering out the down-converted signals from the first or second frequency band.
12. The communication device of claim 6, wherein the dual-band frequency synthesizer comprises a dual-band voltage controlled oscillator configured for simultaneously generating the first local oscillation signals and the second local oscillation signals.
13. The communication device of claim 6, wherein the front-end subsystem comprises in series:
a dual-band antenna configured for receiving radio frequency signals from the first and second frequency bands;
a dual-band filter configured for filtering out the radio frequency signals beyond the first and second frequency bands; and
a dual-band low noise amplifier configured for amplifying the radio frequency signals outputted by the dual-band filter.
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 fluid supply and conditioning system for use in conjunction with a garment having a fluid-impervious bladder with a flow channel having a fluid output port and a fluid input port, the system comprising:
a pump having an inlet and an outlet;
a coolingheating source having an input port and an output port;
a thermostatic mixing valve having first and second input ports and an output port; and
first, second, third, fourth and fifth fluid flow lines;
said first fluid flow line extending from the outlet port of the bladder flow channel to the inlet of said pump to convey fluid from the bladder flow channel to said pump;
said second fluid flow line extending from the pump outlet to the first input port of said mixing valve;
said third fluid flow line extending from the pump outlet to the coolingheating source input port;
said fourth fluid flow line extending from the coolingheating source outlet port to the second input port of said mixing valve; and
said fifth fluid flow line extending from the mixing valve outlet port to the bladder flow channel inlet port;
wherein said system further comprises a thermostatic control switch provided with a temperature sensor, wherein said thermostatic control switch is adapted to activate said pump when the temperature sensor detects a temperature outside of a selected range;
whereby the bladder fluid flow channel inlet port receives from said mixing valve a mixture of (i) fluid received from said second line and (ii) fluid received from said fourth line, whereby to maintain fluid supplied to said bladder input port at a substantially constant temperature.
2. A fluid supply and conditioning system according to claim 1, wherein said pump is adapted to move the fluid into said first and second ports of said thermostatic mixing valve.
3. A fluid supply and conditioning system according to claim 1 wherein said pump comprises a selected one of a diaphragm pump, and a piezo-electric pump.
4. A fluid supply and conditioning system according to claim 1 wherein said thermostatic mixing valve comprises a movable valve element.
5. A fluid supply and conditioning system according to claim 1 wherein said coolingheating source comprises a selected one of an ice bath, a refrigerated supply source, a hot thermal gel bath, a cold thermal gel bath, an electrically-heated supply, and a thermo-electric heat pump.
6. A fluid supply and conditioning system according to claim 1 wherein the temperature sensor is disposed adjacent the bladder.
7. A fluid supply and conditioning system for use in conjunction with a garment having a fluid-impervious bladder with a flow channel having a fluid output port and a fluid input port, the system comprising:
a thermostatic mixing valve having an input port and first and second output ports;
a coolingheating source having an input port and an output port;
a pump having an inlet and an outlet; and
first, second, third, fourth and fifth fluid flow lines;
said fifth fluid flow line extending from the outlet port of the bladder to the input port of said mixing valve;
said fourth fluid flow line extending from the mixing valve first outlet port to the coolingheating source input port;
said third fluid flow line extending from the coolingheating source outlet port to the pump inlet;
said second fluid flow line extending from the mixing valve second outlet port to the pump inlet; and
said first fluid flow line extending from the pump outlet to the fluid input port of the bladder;
wherein said system further comprises a thermostatic control switch provided with a temperature sensor;
wherein said thermostatic control switch is adapted to activate said pump when the temperature sensor detects a temperature outside of a selected range; and
whereby the bladder fluid inlet port receives from said mixing valve a mixture of (i) fluid received from the garment and (ii) fluid received from said coolingheating source.
8. A fluid supply and conditioning system according to claim 7 wherein said pump is adapted to move the fluid out said outlet ports of said thermostatic mixing valve.
9. A fluid supply and conditioning system according to claim 7 wherein said pump is adapted to move the fluid out of said output ports of said thermostatic mixing valve.
10. A fluid supply and conditioning system according to claim 7 wherein said pump comprises a selected one of a diaphragm pump and a piezo-electric pump.
11. A fluid supply and conditioning system according to claim 7 wherein said thermostatic mixing valve comprises a movable valve element.
12. A fluid supply and conditioning system according to claim 7 wherein said coolingheating source comprises a selected one of an ice bath, a refrigerated supply source, a hot thermal gel bath, a cold thermal gel bath, an electrically-heated supply, and a thermo-electric heat pump.
13. A fluid supply and conditioning system according to claim 7 wherein the temperature sensor is disposed adjacent the bladder.