Abstract: A surface-treated intervertebral fusion cage is provided, including a main body and a porous structure portion. The porous structure portion is arranged at the corresponding position of the upper and lower parts of the main body. The surface-treated intervertebral fusion cage can improve the biocompatibility, and the surface etching and thermal treatment can increase the coating coverage and increase the mechanical toughness of the cage of the present invention.

Abstract: A flexible intervertebral cage with opening is provided, including a main body, a porous structure part, a side opening, and a rear opening. The porous structure part is arranged at the corresponding positions of the upper and lower parts of the main body; the side opening are located on the two sides of the main body that are different from the upper and lower parts, and the rear opening is located at the other ends of the upper and lower parts of the main body opposite to the end part that connects the upper and lower part. As such, a C-shaped opening structure is used to effectively reduce stress shielding and stress transfer. The biomimetic porous structure of the structural part can promote the attachment and growth of bone cells.

Abstract: The present invention relates to a glass-ceramic composite material, which is a composite material with degradability and osteoconductivity, and is composed of CaO—MgO—SiO2 (CMS glass)+CaMgSi2O6 (CMS ceramic) and CaSO4 (CS ceramic). In addition to the CaO—MgO—SiO2 glass, this synthesized composite material mainly includes two ceramics of CaMgSi2O6 and CaSO4 in crystalline phase, wherein, both the CMS glass and CMS ceramic have high mechanical strength, biocompatibility and osteoconductivity, while CaSO4 has the characteristics of rapid degradation to promote bone ingrowth.

Abstract: A glass ceramic manufactured by sequentially performing the processes of melting and thermal decomposition, water quenching and sintering of a glass composite. The glass ceramic includes 38 wt % to 49 wt % CaO, 41 wt % to 52 wt % SiO2 and 0.1 wt % to 20 wt % P2O5. The glass composite includes a glass component and P2O5, and the glass component includes CaCO3 and SiO2 and does not include an alkali metal oxide. The melting and thermal composition temperature is from 1350° C. to 1650° C. The sintering temperature is from 750° C. to 1050° C. By the combination of CaO, SiO2 and P2O5 and the control of the contents of CaO, SiO2 and P2O5 within the aforementioned ranges, and the glass ceramic contains no alkali metal oxide, the glass ceramic has good mechanical strength and low cytotoxicity.

Abstract: A current controlling device includes: a first resistive circuit arranged to selectively conduct a first current to a first output terminal from a first input terminal; and a second resistive circuit arranged to selectively conduct a second current to a second output terminal from the first input terminal; wherein when the first resistive circuit conducts the first current to the first output terminal and when the second resistive circuit does not conduct the second current to the second output terminal, the first input terminal has a first input impedance; when the first resistive circuit does not conduct the first current to the first output terminal and when the second resistive circuit conducts the second current to the second output terminal, the first input terminal has a second input impedance substantially equal to the first input impedance.

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 SAR ADC including a comparator, an input switch unit, a positive conversion capacitor array, a negative conversion capacitor array, and a SAR controller is provided. The input switch unit alternately couples and decouples a differential analog input signal to the comparator. The positive and negative conversion capacitor arrays sample the differential analog input signal during the sampling phase. The SAR controller resets the switches in the capacitor arrays at the end of the sampling phase to change the sampled voltage into a residual signal, generates an intermediate digital code to control the switches during the conversion phase according to an output of the comparator to convert the residual signal to the intermediate digital code, generates the digital code according to the intermediate digital code, and uses an inverted intermediate digital code to control the switches at the end of the conversion phase.

Abstract: A SAR ADC including a comparator, an input switch unit, a positive conversion capacitor array, a negative conversion capacitor array, and a SAR controller is provided. The input switch unit alternately couples and decouples a differential analog input signal to the comparator. The positive and negative conversion capacitor arrays sample the differential analog input signal during the sampling phase. The SAR controller resets the switches in the capacitor arrays at the end of the sampling phase to change the sampled voltage into a residual signal, generates an intermediate digital code to control the switches during the conversion phase according to an output of the comparator to convert the residual signal to the intermediate digital code, generates the digital code according to the intermediate digital code, and uses an inverted intermediate digital code to control the switches at the end of the conversion phase.

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 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 multi-mode OPAMP-based circuit is provided. An input amplifying stage amplifies a pair of input differential signals to provide a pair of intermediate differential signals. An output amplifying stage amplifies the pair of intermediate differential signals to provide a pair of output differential signals. A first capacitor is disposed in a first negative feedback loop of the output amplifying stage. A second capacitor is disposed in a second negative feedback loop of the output amplifying stage. A third capacitor is selectively disposed in a first positive feedback loop of the output amplifying stage or coupled to the first capacitor in parallel according to a control signal. A fourth capacitor is selectively disposed in a second positive feedback loop of the output amplifying stage or coupled to the second capacitor in parallel according to the control signal.

Abstract: A low pass filter includes a first amplifier stage and a second amplifier stage. The first amplifier stage includes a differential operational amplifier, wherein the first amplifier stage is arranged to process a differential input signal to generate a differential intermediate signal, the differential input signal having a first input signal and a second input signal, and the differential intermediate signal having a first intermediate signal and a second intermediate signal. The second amplifier stage has no common-mode feedback and is arranged to process the differential intermediate signal to generate a differential output signal, wherein the differential output signal has a first output signal corresponding to the first input signal and a second output signal corresponding to the second input signal. Since the noisy common-mode feedback is removed from the second amplifier stage, the overall common-mode noise of the low pass filter can be decreased.

Abstract: A dynamic feed-forward OPAMP-based circuit is provided. A first amplifying stage amplifies a pair of input differential signals to provide a pair of intermediate differential signals. A second amplifying stage amplifies the pair of intermediate differential signals to provide a pair of output differential signals. A first capacitor is coupled to a non-inverting input terminal of the first amplifying stage. A second capacitor is coupled to an inverting input terminal of the first amplifying stage. A feed-forward transconductance stage is coupled between the first and second capacitors and the second amplifying stage. The first and second capacitors and the feed-forward stage form a high-frequency path with a first gain curve, and the first amplifying stage and the second amplifying stage form a high-gain path with a second gain curve. The operational amplifier provides an open-loop gain according to the first and second gain curves.

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 low pass filter includes a first amplifier stage and a second amplifier stage. The first amplifier stage includes a differential operational amplifier, wherein the first amplifier stage is arranged to process a differential input signal to generate a differential intermediate signal, the differential input signal having a first input signal and a second input signal, and the differential intermediate signal having a first intermediate signal and a second intermediate signal. The second amplifier stage has no common-mode feedback and is arranged to process the differential intermediate signal to generate a differential output signal, wherein the differential output signal has a first output signal corresponding to the first input signal and a second output signal corresponding to the second input signal. Since the noisy common-mode feedback is removed from the second amplifier stage, the overall common-mode noise of the low pass filter can be decreased.

Abstract: A current controlling device includes: a first resistive circuit arranged to selectively conduct a first current to a first output terminal from a first input terminal; and a second resistive circuit arranged to selectively conduct a second current to a second output terminal from the first input terminal; wherein when the first resistive circuit conducts the first current to the first output terminal and when the second resistive circuit does not conduct the second current to the second output terminal, the first input terminal has a first input impedance; when the first resistive circuit does not conduct the first current to the first output terminal and when the second resistive circuit conducts the second current to the second output terminal, the first input terminal has a second input impedance substantially equal to the first input impedance.

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 dynamic feed-forward OPAMP-based circuit is provided. A first amplifying stage amplifies a pair of input differential signals to provide a pair of intermediate differential signals. A second amplifying stage amplifies the pair of intermediate differential signals to provide a pair of output differential signals. A first capacitor is coupled to a non-inverting input terminal of the first amplifying stage. A second capacitor is coupled to an inverting input terminal of the first amplifying stage. A feed-forward transconductance stage is coupled between the first and second capacitors and the second amplifying stage. The first and second capacitors and the feed-forward stage form a high-frequency path with a first gain curve, and the first amplifying stage and the second amplifying stage form a high-gain path with a second gain curve. The operational amplifier provides an open-loop gain according to the first and second gain curves.

Abstract: A multi-mode OPAMP-based circuit is provided. An input amplifying stage amplifies a pair of input differential signals to provide a pair of intermediate differential signals. An output amplifying stage amplifies the pair of intermediate differential signals to provide a pair of output differential signals. A first capacitor is disposed in a first negative feedback loop of the output amplifying stage. A second capacitor is disposed in a second negative feedback loop of the output amplifying stage. A third capacitor is selectively disposed in a first positive feedback loop of the output amplifying stage or coupled to the first capacitor in parallel according to a control signal. A fourth capacitor is selectively disposed in a second positive feedback loop of the output amplifying stage or coupled to the second capacitor in parallel according to the control signal.