Abstract: An impeller includes a hub and blades. In radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge. The recess structure is connected to the peak structure. The blade has at least five airfoils from the inner edge to the outer edge. The blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface. The groove structure and the peak structure are aside the outer edge of the blade.

Abstract: An impeller and a fan are provided. The impeller includes a hub, a plurality of first blades, a plurality of second blades and a connecting member. The plurality of first blades are disposed around the hub separately. Each first blade is connected with a periphery of the hub. The plurality of second blades are disposed around the hub separately. Each second blade is disposed away from the periphery of the hub and located between two adjacent first blades of the plurality of first blades. The connecting member is disposed around the hub and penetrated through the plurality of first blades and the plurality of second blades. The connecting member is not in contact with a first edge of any side of each first blade. The connecting member is not in contact with a second edge of any side of each second blade.

Abstract: An impeller includes a hub and blades. In radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge. The recess structure is connected to the peak structure. The blade has at least five airfoils from the inner edge to the outer edge. The blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface. The groove structure and the peak structure are aside the outer edge of the blade.

Abstract: A resonating device includes: an amplifying circuit having a first input terminal, and an output terminal for outputting an output signal; a first feedback circuit coupled between the first input terminal and the output terminal of the amplifying circuit; a second feedback circuit, coupled between the first input terminal and the output terminal of the amplifying circuit; and a gain adjusting circuit, having an input terminal for receiving an input signal, and a first output terminal coupled to the first input terminal of the amplifying circuit; wherein a first equivalent impedance on a first intermediate terminal in the first feedback circuit substantially equals a second equivalent impedance on a second intermediate terminal in the second feedback circuit, and the gain adjusting circuit is arranged to tune a transfer function from the input signal to the output signal.

Abstract: A signal modulating device includes: an integrating circuit arranged to generate an integrated signal according to a scaled analog signal and a first feedback signal; a resonating circuit arranged to generate a resonating signal according to the integrated signal; a first signal converting circuit arranged to convert the resonating signal into a digital output signal; a second signal converting circuit arranged to convert the digital output signal into the first feedback signal; and a first impedance circuit having a first terminal receiving an analog signal and a second terminal coupled to the resonating circuit for altering the location of zeros in the forward-path transfer function and consequently shaping the signal transfer function (STF) of the signal modulating device; and a second impedance circuit having a first terminal receiving the analog signal and a second terminal coupled to the integrating circuit for generating the scaled analog signal.

Abstract: A resonating device includes: an amplifying circuit having a first input terminal, and an output terminal for outputting an output signal; a first feedback circuit coupled between the first input terminal and the output terminal of the amplifying circuit; a second feedback circuit, coupled between the first input terminal and the output terminal of the amplifying circuit; and a gain adjusting circuit, having an input terminal for receiving an input signal, and a first output terminal coupled to the first input terminal of the amplifying circuit; wherein a first equivalent impedance on a first intermediate terminal in the first feedback circuit substantially equals a second equivalent impedance on a second intermediate terminal in the second feedback circuit, and the gain adjusting circuit is arranged to tune a transfer function from the input signal to the output signal.

Abstract: A signal modulating device includes: an integrating circuit arranged to generate an integrated signal according to a scaled analog signal and a first feedback signal; a resonating circuit arranged to generate a resonating signal according to the integrated signal; a first signal converting circuit arranged to convert the resonating signal into a digital output signal; a second signal converting circuit arranged to convert the digital output signal into the first feedback signal; and a first impedance circuit having a first terminal receiving an analog signal and a second terminal coupled to the resonating circuit for altering the location of zeros in the forward-path transfer function and consequently shaping the signal transfer function (STF) of the signal modulating device; and a second impedance circuit having a first terminal receiving the analog signal and a second terminal coupled to the integrating circuit for generating the scaled analog signal.

Abstract: An analog-to-digital converting device includes: an integrator arranged to generate an integrating signal according to an analog input signal and a first analog feedback signal; a low-pass filter arranged to generate a first filtered signal according to the integrating signal; an analog-to-digital converter arranged to generate a digital output signal according to the first filtered signal; and a first digital-to-analog converter arranged to generate the first analog feedback signal according to the digital output signal.

Abstract: An analog-to-digital converting device includes: an integrator arranged to generate an integrating signal according to an analog input signal and a first analog feedback signal; a low-pass filter arranged to generate a first filtered signal according to the integrating signal; an analog-to-digital converter arranged to generate a digital output signal according to the first filtered signal; and a first digital-to-analog converter arranged to generate the first analog feedback signal according to the digital output signal.

Abstract: A method for achieving high-speed analog-to-digital conversion without degrading accuracy includes: receiving digital outputs of a plurality of pipelined analog-to-digital converters (ADCs) that perform analog-to-digital conversion on a same analog signal; and performing digital calculations on the digital outputs to generate a calibrated digital output. An apparatus for achieving high-speed analog-to-digital conversion without degrading accuracy is further provided. The apparatus includes: a digital module arranged to receive digital outputs of a plurality of pipelined ADCs that perform analog-to-digital conversion on a same analog signal. In addition, the digital module includes a plurality of digital calculation paths respectively corresponding to the pipelined ADCs, wherein each digital calculation path corresponding to an associate pipelined ADC of the pipelined ADCs is electrically connected to the associate pipelined ADC.

Abstract: A method for achieving high-speed analog-to-digital conversion without degrading accuracy includes: receiving digital outputs of a plurality of pipelined analog-to-digital converters (ADCs) that perform analog-to-digital conversion on a same analog signal; and performing digital calculations on the digital outputs to generate a calibrated digital output. An apparatus for achieving high-speed analog-to-digital conversion without degrading accuracy is further provided. The apparatus includes: a digital module arranged to receive digital outputs of a plurality of pipelined ADCs that perform analog-to-digital conversion on a same analog signal. In addition, the digital module includes a plurality of digital calculation paths respectively corresponding to the pipelined ADCs, wherein each digital calculation path corresponding to an associate pipelined ADC of the pipelined ADCs is electrically connected to the associate pipelined ADC.