Abstract: A characteristic impedance of an electric transmission line is measured by way of extraction. In the method, a first probe and a second probe are provided, wherein the first probe and the second probe are separable and independently operable probes. A first characteristic impedance of a first circuit where a first terminal of the first probe and a first terminal of the second probe are directly interconnected to each other is first measured. Then a second characteristic impedance of a second circuit where the first terminal of the first probe and the first terminal of the second probe are connected to opposite terminals of the electric transmission line, respectively, is measured. The characteristic impedance of the electric transmission line can then be obtained according to the first characteristic impedance and the second characteristic impedance.

Abstract: A characteristic impedance of an electric transmission line is measured by way of extraction. In the method, a first probe and a second probe are provided, wherein the first probe and the second probe are separable and independently operable probes. A first characteristic impedance of a first circuit where a first terminal of the first probe and a first terminal of the second probe are directly interconnected to each other is first measured. Then a second characteristic impedance of a second circuit where the first terminal of the first probe and the first terminal of the second probe are connected to opposite terminals of the electric transmission line, respectively, is measured. The characteristic impedance of the electric transmission line can then be obtained according to the first characteristic impedance and the second characteristic impedance.

Abstract: A controlling system of a touch panel comprises of a drive signal generating circuit, a sensing module for sensing a waveform signal from the touch panel, and a signal processing module for enabling and disabling the drive signal generating circuit based on the signal outputted by the sensing module. Therefore, the mentioned controlling system can support the active and the passive touch modes. In addition, the present invention further provides a controlling method of the touch panel and a stylus pen applied to the mentioned controlling system.

Abstract: The present invention relates to a control circuit and control method for detecting the capacitance of a touch panel. The control circuit comprises: a signal-detecting circuit for charging a sensing wire of the touch panel to obtain an intensity signal of the sensing wire; an intensity/frequency conversion unit for converting the intensity signal into a frequency signal, the frequency of which corresponds to the level of the intensity signal; and a frequency-analyzing unit for analyzing the frequency signal to obtain a signal amount of the corresponding sensing wire. The control circuit for the capacitive touch panel has a good SNR, which will not be affected or lowered by noise signals in the circuit environment, and is constituted of simple components to reduce the occupied area on the chip and lower the cost.

Abstract: A control circuit for a sensing electrode array is described. The control circuit for the sensing electrode array includes a signal intensity analyzer, an intensity-to-phase frequency converter, and a phase frequency analyzing unit. The signal intensity analyzer obtains an intensity signal corresponding to a sensing signal of each sensing line of the sensing electrode array, wherein each intensity signal is a direct-current signal. The intensity-to-phase frequency converter generates a phase frequency signal based on the intensity signal. At least the phase or the frequency of the phase frequency signal is related to the level of the corresponding intensity signal. The phase frequency analyzing unit obtains a signal magnitude of the corresponding sensing line according to each phase frequency signal. The control circuit for the sensing electrode array enhances the operating speed and the signal-to-noise ratio of the touch control sensing system without increasing the manufacturing cost.

Abstract: A controlling system of a touch panel comprises of a drive signal generating circuit, a sensing module for sensing a waveform signal from the touch panel, and a signal processing module for enabling and disabling the drive signal generating circuit based on the signal outputted by the sensing module. Therefore, the mentioned controlling system can support the active and the passive touch modes. In addition, the present invention further provides a controlling method of the touch panel and a stylus pen applied to the mentioned controlling system.

Abstract: The present invention relates to a control circuit and control method for detecting the capacitance of a touch panel. The control circuit comprises: a signal-detecting circuit for charging a sensing wire of the touch panel to obtain an intensity signal of the sensing wire; an intensity/frequency conversion unit for converting the intensity signal into a frequency signal, the frequency of which corresponds to the level of the intensity signal; and a frequency-analyzing unit for analyzing the frequency signal to obtain a signal amount of the corresponding sensing wire. The control circuit for the capacitive touch panel has a good SNR, which will not be affected or lowered by noise signals in the circuit environment, and is constituted of simple components to reduce the occupied area on the chip and lower the cost.

Abstract: A control system of a touch panel comprises a voltage controlled oscillator and a signal processing module. The voltage controlled oscillator is used for converting a direct current voltage signal that corresponds to a sensing signal of said touch panel into a sinusoidal signal. The signal processing module counts the frequency of the sinusoidal signal. The voltage controlled oscillator of the control system of touch panel converts direct current voltage signal into sinusoidal signal. Due to a wide change in the range of frequency of the sinusoidal signal that is outputted from the voltage controlled oscillator, the signal is not easily affected by noise, and thus, the signal-to-noise ratio of control system is comparatively higher. The present disclosure also provides a control method of touch panel.

Abstract: A control circuit for a sensing electrode array is described. The control circuit for the sensing electrode array includes a down-conversion circuit, an intensity-to-phase frequency converter, and a phase frequency analyzing unit. The down-conversion circuit down-converts a sensing signal of each sensing line of the sensing electrode array to obtain a corresponding down-converted signal. Each down-converted signal is substantially a direct-current signal. The intensity-to-phase frequency converter generates a corresponding phase frequency signal for each down-converted signal. At least the phase or the frequency of the phase frequency signal is related to the level of the corresponding down-converted signal. The phase frequency analyzing unit obtains signal magnitude of the corresponding sensing lines based on the phase frequency signal.

Abstract: A control circuit for a sensing electrode array is described. The control circuit for the sensing electrode array includes a signal intensity analyzer, an intensity-to-phase frequency converter, and a phase frequency analyzing unit. The signal intensity analyzer obtains an intensity signal corresponding to a sensing signal of each sensing line of the sensing electrode array, wherein each intensity signal is a direct-current signal. The intensity-to-phase frequency converter generates a phase frequency signal based on the intensity signal. At least the phase or the frequency of the phase frequency signal is related to the level of the corresponding intensity signal. The phase frequency analyzing unit obtains a signal magnitude of the corresponding sensing line according to each phase frequency signal. The control circuit for the sensing electrode array enhances the operating speed and the signal-to-noise ratio of the touch control sensing system without increasing the manufacturing cost.

Abstract: A capacitive touch panel comprises: a substrate and a touch sensor. The touch sensor is disposed on the substrate and includes a plurality of conductive elements, an input bus, and an output bus. The conductive elements are arranged to form a sensing matrix on same surface of the substrate. The input bus is electrically connected to one end of a first axis of the sensing matrix. The output bus is electrically connected to one end of a second axis of the sensing matrix. By this means, the present disclosure can achieve the purpose of simplifying the architecture of the capacitive touch panel.

Abstract: An RF front-end architecture is operated in either a transmitting or a receiving mode. The RF front-end architecture comprises an antenna, an impedance match network, a balun and a transceiver chip. The transceiver chip comprises first and second transmit/receive (TR) switches, a transmitter, and a receiver. Because two TR switches are integrated into the chip, the printed circuit board area, BOM cost and pin count of the transceiver chip can be greatly reduced.

Abstract: A RF transceiver includes an antenna, a receiver, a baseband circuit, a transmitter, and a T/R switch circuit. The T/R switch circuit is used for coupling the antenna and the receiver or coupling the antenna and the transmitter. The T/R switch circuit is coupled to the baseband circuit so as to receive biases provided from the baseband circuit. The T/R switch circuit includes four transistors and a power detector. The power detector detects the power of the output signal of the T/R switch circuit, so that the baseband circuit can adjust biases provided to the T/R switch circuit according to the power of the output signal.

Abstract: An RF front-end architecture is operated in either a transmitting or a receiving mode. The RF front-end architecture comprises an antenna, an impedance match network, a balun and a transceiver chip. The transceiver chip comprises first and second transmit/receive (TR) switches, a transmitter, and a receiver. Because two TR switches are integrated into the chip, the printed circuit board area, BOM cost and pin count of the transceiver chip can be greatly reduced.

Abstract: A RF transceiver includes an antenna, a receiver, a baseband circuit, a transmitter, and a T/R switch circuit. The T/R switch circuit is used for coupling the antenna and the receiver or coupling the antenna and the transmitter. The T/R switch circuit is coupled to the baseband circuit so as to receive biases provided from the baseband circuit. The T/R switch circuit includes four transistors and a power detector. The power detector detects the power of the output signal of the T/R switch circuit, so that the baseband circuit can adjust biases provided to the T/R switch circuit according to the power of the output signal.

Abstract: A method and an apparatus for analyzing performance of a multi-stage radio frequency amplifier are described. The method simplifies the multi-stage radio frequency amplifier into equivalent input parts, output parts and mid-stage parts. The mid-stage parts are temporarily unset. Therefore, the equivalent input parts and output parts will be adjusted to make best gain performance and the mid-stage parts will be the next targets for analysis. Repeating the above-mentioned methods for decomposing the circuit can systemize the method for analyzing circuits and problems in each part of the circuit may be found more quickly.

Abstract: A power amplifying module includes an input end for inputting power, an output end for outputting amplified power, and an amplifier cascade. Each amplifier comprises at least a heterojunction bipolar transistor (HBT) connected with each other in a parallel manner. The closer the amplifier to the input end is, the smaller the number of HBTs the amplifier has.

Abstract: Wireless output chip with a power detector and related manufacturing method. A BiCMOS process is used to integrate a power amplifier and a power detector, which detects power outputted by the power amplifier, into one chip. The power amplifier including bipolar junction transistors is formed by using BJT forming procedures in the BiCMOS process. The power detector includes a charging unit of a capacitor, a controlled current source and a reference current source constructed by metal-oxide-semiconductor transistors formed by MOS forming procedures in the BiCMOS process. Thus, the power detector and the power amplifier can be integrated into one chip using the low-cost BiCMOS process.