Abstract: A panel attachable to a backpack body. The panel having at least one through-hole formed therein to allow air to flow into a gap defined between the panel and the backpack body. An air-moving device is mountable to the panel, with an outer portion of the air-moving device extending forwardly from the panel and an inner portion of the air-moving device positioned in the gap. The air-moving device causes air to flow into the gap through the at least one through-hole and into one or more inlets of the inner portion. The air-moving device causes air to flow out one or more outlets of the outer portion.

Abstract: A panel attachable to a backpack body. The panel having at least one through-hole formed therein to allow air to flow into a gap defined between the panel and the backpack body. An air-moving device is mountable to the panel, with an outer portion of the air-moving device extending forwardly from the panel and an inner portion of the air-moving device positioned in the gap. The air-moving device causes air to flow into the gap through the at least one through-hole and into one or more inlets of the inner portion. The air-moving device causes air to flow out one or more outlets of the outer portion.

Abstract: A circuit for generating a plurality of oscillating signals with different phases includes a frequency divider, a first delay chain, a second delay chain and a calibration circuit. The frequency divider is arranged for frequency dividing a first input signal and a second input signal to generate a first frequency-divided input signal and a second frequency-divided input signal. The first delay chain is arranged for delaying the first frequency-divided input signal, and the second delay chain is arranged for delaying the second frequency-divided input signal. The calibration circuit is arranged for controlling delay amounts of the first delay chain and the second delay chain according to signals within the first delay chain or the second delay chain; wherein output signals of a portion delay cells within the first delay chain and the second delay chain serve as the plurality of oscillating signals with different phases.

Abstract: A circuit for generating a plurality of oscillating signals with different phases includes a frequency divider, a first delay chain, a second delay chain and a calibration circuit. The frequency divider is arranged for frequency dividing a first input signal and a second input signal to generate a first frequency-divided input signal and a second frequency-divided input signal. The first delay chain is arranged for delaying the first frequency-divided input signal, and the second delay chain is arranged for delaying the second frequency-divided input signal. The calibration circuit is arranged for controlling delay amounts of the first delay chain and the second delay chain according to signals within the first delay chain or the second delay chain; wherein output signals of a portion delay cells within the first delay chain and the second delay chain serve as the plurality of oscillating signals with different phases.

Abstract: A communication device is provided in the present invention. The communication device comprises an oscillation signal source, a tunable capacitor array, a frame counter; and a control module. The control module is configured to jointly or separately control the tunable capacitor array and the frame counter to compensate a first frequency offset of the oscillation signal source when the communication device operates in a first mode, and to jointly or separately control the tunable capacitor array and the frame counter to compensate a second frequency offset of the oscillation signal source when the communication device operates in a second mode.

Abstract: A communication device is provided in the present invention. The communication device comprises an oscillation signal source, a tunable capacitor array, a frame counter; and a control module. The control module is configured to jointly or separately control the tunable capacitor array and the frame counter to compensate a first frequency offset of the oscillation signal source when the communication device operates in a first mode, and to jointly or separately control the tunable capacitor array and the frame counter to compensate a second frequency offset of the oscillation signal source when the communication device operates in a second mode.