Abstract: A multi-mode and multi-band front-end device comprises at least one amplifier unit, at least one switching unit, at least one control unit, a plurality of transmission paths, and a plurality of frequency matching networks. The switching unit comprises at least input end and a plurality of connecting ends. Wherein the input end is electrically connected to the amplifier unit, and each of connecting ends is connected to each of transmission paths, respectively. Each of frequency matching networks is configured on each of transmission paths, and achieves impedance matching at different frequency bands, respectively. The multi-mode and multi-band front-end device is able to select one of transmission paths to transmit RF signal according to the frequency band of RF signal to be transmitted so as to improve the output power of the multi-mode and multi-band front-end device.

Abstract: A switching device having a good isolation characteristic is disclosed. The switching device comprises a switch unit and a control unit, wherein the control unit is connected to a power supply terminal, and connected to the switch unit via a control line and a power line. The control unit comprises a voltage regulator unit that is electrically connected to the power supply terminal and the power line of the switch unit. When the switch unit enters standby mode, the control unit provides an isolation voltage to the switch unit to effectively enhance the isolation characteristic of the switching device in the standby mode.

Abstract: The present invention is related to a wireless transceiver with function of adjustment for frequency-band matching and the adjusting method therefor, mainly comprising a plurality of transmitting circuits, a plurality of receiving circuits, a frequency-band matching adjustment circuit, and a radio-frequency signal transceiving end. In this connection, the transmitting circuits and/or the receiving circuits are connected to the radio-frequency signal transceiving end via the frequency-band matching adjustment circuit. Impedance in the frequency-band matching adjustment circuit may be adjusted on the basis of the frequency-band of a RF signal, when (before) the RF signal is transmitted or received, such that high impedance or low impedance is presented in the frequency-band matching adjustment circuit with respect to the frequency-band of the received or transmitted RF signal. Thereby, loss of RF signal in reception or transmission is reduced.

Abstract: The invention provides a power amplifier circuit capable of adjusting gain dynamically. The power amplifier circuit comprises a power supply unit configured to provide a power supply signal; an input power detection unit for receiving at least one input signal and the power supply signal, detecting the power of the input signal to generate a detection signal, and pulling up or down a bias signal by the detection signal; a power amplifier unit for receiving the input signal and the bias signal, adjusting the gain by the controlling of the bias signal, and amplifying the input signal by the adjusted gain to output at least one output signal. Therefore, the gain of power amplifier circuit will be adjusted dynamically by detecting the power of the input signal, so that the output signal conforming to the actual power may be outputted.

Abstract: The present invention relates to a method for compensating a power amplification unit of a wireless RF module that includes a baseband unit, a RF transceiver unit, a power amplification unit and a control unit. The baseband unit is connected to the power amplification unit through the control unit and the RF transceiver unit. Based on the characteristic of the power amplification unit, the baseband unit provides a control signal to regulate the output signal characteristic of the power amplification unit, or provides a RF transceiver unit control signal to regulate the characteristics of the RF signal being transmitted by the RF transceiver unit to the power amplification unit, or to regulate the characteristics of the baseband signal being transmitted to the RF transceiver unit, enabling the characteristics of the output signal of the power amplification unit to meet the specifications of the related system.

Abstract: The present invention provides a digital television signal reception system, comprising a chip having a low-noise amplifier and a master receiver, at least one slave receiver, and at least one local-oscillator leakage processing unit. The chip receives at least one digital input signal of television channel. The low-noise amplifier amplifies and sends the input signal of television channel to the master/slave receiver. The input signal of television channel is frequency-mixed by the master/slave receiver so as to output an output signal of second television channel and an output signal of second television channel. The local-oscillator leakage processing unit detects and removes local-oscillator leakage of the master receiver included in the output signal of second television channel, so as to avoid interference of the local leakage of master receiver on sensitivity of receiving the output signal of second television channel of slave receiver by the slave television.

Abstract: A mixer with calibration circuit includes a first gm stage unit, a second gm stage unit, a first detecting unit, a second detecting unit, a comparison block, a control unit and a compensator. The first detecting unit and the second detecting unit are respectively connected to different gm stage unit, and the comparison block compares voltage signals of the first detecting unit and the second detecting unit. The control unit adjusts a current signal of the comparison block according to the comparative result of voltage signals of the first detecting unit and the second detecting unit. Further, the compensator adjusts the first gm stage unit and the second gm stage unit according to the current signal. Thereafter, the improvement of the LO leakage of the mixer can be achieved.

Abstract: The present invention is related to a wireless transceiver with function of adjustment for frequency-band matching and the adjusting method therefor, mainly comprising a plurality of transmitting circuits, a plurality of receiving circuits, a frequency-band matching adjustment circuit, and a radio-frequency signal transceiving end. In this connection, the transmitting circuits and/or the receiving circuits are connected to the radio-frequency signal transceiving end via the frequency-band matching adjustment circuit. Impedance in the frequency-band matching adjustment circuit may be adjusted on the basis of the frequency-band of a RF signal, when (before) the RF signal is transmitted or received, such that high impedance or low impedance is presented in the frequency-band matching adjustment circuit with respect to the frequency-band of the received or transmitted RF signal. Thereby, loss of RF signal in reception or transmission is reduced.

Abstract: The present invention provides a digital television signal reception system, comprising a chip having a low-noise amplifier and a master receiver, at least one slave receiver, and at least one local-oscillator leakage processing unit. The chip receives at least one digital input signal of television channel. The low-noise amplifier amplifies and sends the input signal of television channel to the master/slave receiver. The input signal of television channel is frequency-mixed by the master/slave receiver so as to output an output signal of second television channel and an output signal of second television channel. The local-oscillator leakage processing unit detects and removes local-oscillator leakage of the master receiver included in the output signal of second television channel, so as to avoid interference of the local leakage of master receiver on sensitivity of receiving the output signal of second television channel of slave receiver by the slave television.

Abstract: A method or a system for acoustic channel information detection includes at least one speaker and at least one microphone within an environment. The microphone receives a CDMA modulated audio training signal from the speaker via a plurality of acoustic channels within the environment, wherein the CDMA modulated audio training signal is a pre-known CDMA modulated audio training signal, and comprises a data signal, a spreading code and/or a continuous frequency code. Thus, the microphone is able to estimate the acoustic channel information including frequency dependence according to the received CDMA modulated audio training signal and the pre-known CDMA modulated audio training signal.

Abstract: An RF front-end module includes a transmitting/receiving terminal, a control unit, a first transmitting block and a second transmitting block. The first transmitting block and the second transmitting block connect the transmitting/receiving terminal and the control unit. The control unit controls on or off status of the first transmitting block and the second transmitting block. Thus, the first transmitting block and the second transmitting block can send a signal to the transmitting/receiving terminal directly without pass through any switch unit, avoiding extra signal loss on switch unit.

Abstract: A mixer with calibration circuit includes a first gm stage unit, a second gm stage unit, a first detecting unit, a second detecting unit, a comparison block, a control unit and a compensator. The first detecting unit and the second detecting unit are respectively connected to different gm stage unit, and the comparison block compares voltage signals of the first detecting unit and the second detecting unit. The control unit adjusts a current signal of the comparison block according to the comparative result of voltage signals of the first detecting unit and the second detecting unit. Further, the compensator adjusts the first gm stage unit and the second gm stage unit according to the current signal. Thereafter, the improvement of the LO leakage of the mixer can be achieved.

Abstract: An integrated circuit for executing external program codes comprises a processor, a read only memory for storing program codes of a first routine and a second routine, and a random access memory comprising a first memory block and a second memory block. The processor executes the first routine and uses a plurality of first memory units in the first memory block for accessing data. The processor executes the second routine and uses a plurality of second memory units in the first memory block for accessing data. The first and second memory units comprise one or more common memory units. The processor executes a third routine stored in an external read only memory and accesses the data of the third routine in the second memory block.

Abstract: A gain control circuit of the wireless receiver comprises a plurality of stages-amplifier, an analog gain control circuit, and a digital gain control circuit, wherein the analog gain control circuit generates an analog controlling voltage for regulating the gain of the post-amplifier by an analog gain controlling process, and the digital gain control circuit is used for determining a plurality of gain curves for the pre-amplifier, and the gain curves are all operating between the first default voltage and second default voltage. While the analog controlling voltage is over the first default voltage or second default voltage, the gain curve will be switched, thereby, the analog gain controlling process can be with the digital gain controlling process therein for improving the linearity of the gain regulation and reducing the transient response during the gain switching process.

Abstract: A wireless transceiver chip and calibration method thereof are disclosed. The wireless transceiver chip comprises at least one receiver, at least one transmitter, and at least one switch. The switch is connected to the receiver and the transmitter respectively for being applied to switch between the receiver and the transmitter. Practically, the switch is provided within the wireless transceiver chip, such that the pin count of the wireless transceiver chip can be reduced.

Abstract: A manufacturing method for the inductor/transformer is disclosed. A simulator is used to simulate the inductance, the quality factor, and the self-resonance frequency of said inductor/transformer to generate at least one group of the area size, the number of the conductive layer, the line width, the number of turns, and/or the line space of the conductive layers and the first conductive layer; the inductor/transformer is manufactured according to the factors. Thereafter, the Monte-Carlo simulation is used to initiate the process variability analysis of the factors of the conductive layer and the first conductive layer, and the geometric size of the inductor/transformer can be modulated according to the results of the process variability analysis during the manufacturing process, such that the inductor/transformer can be manufactured by the process of the generic logic circuit.

Abstract: A front-end circuit of the wireless transceiver is disclosed to reduce the number of the pin count of the chip, and achieve the impedance matching. The circuit comprises an antenna unit, a receiver, and a transmitting block, all of which are connected together, wherein there is no switch provided between the receiver and the antenna unit, such that the loss of switch can be avoided for reducing the noise figure and improve the sensitivity of the receiving path accordingly.

Abstract: A bias circuit for the wireless transceiver is disclosed, which can be used for modulating the gain of the amplifier. The bias circuit comprises a first stage bias unit for receiving a constant current, a control voltage, and a first reference voltage and outputting a first outputting current, wherein the control voltage is used for controlling the value of the first outputting current, and further, the first outputting current can be increased or decreased by representing as an analog form, thus, the gain of the amplifier can be modulated according to the first outputting current, and the modulation of the gain can be represented as an analog form, such that the transient response occurred while the gain is modulated can be reduced.

Abstract: An amplifier gain control circuit for the wireless transceiver comprises at least one amplifier, an analog to digital converter (ADC), a digital to analog converter (DAC) and a bias circuit, wherein the ADC is used for receiving an analog gain control voltage to generate a digital control signal that can be used for controlling the gain of the amplifier, the DAC is used for receiving the digital signal to generate an analog signal, and the bias circuit is used for receiving the analog signal and the analog gain control voltage to further fine-tune the gain of the amplifier by the analog process for correcting the least bit error during the digital process, therefore, the amplifier during the gain adjustment will be prevented to operate in the nonlinear area.

Abstract: A gain control circuit of the wireless receiver comprises a plurality of stages-amplifier, an analog gain control circuit, and a digital gain control circuit, wherein the analog gain control circuit generates an analog controlling voltage for regulating the gain of the post-amplifier by an analog gain controlling process, and the digital gain control circuit is used for determining a plurality of gain curves for the pre-amplifier, and the gain curves are all operating between the first default voltage and second default voltage. While the analog controlling voltage is over the first default voltage or second default voltage, the gain curve will be switched, thereby, the analog gain controlling process can be with the digital gain controlling process therein for improving the linearity of the gain regulation and reducing the transient response during the gain switching process.