Abstract: The present disclosure illustrates a speaker apparatus and a speaker apparatus system, wherein the speaker apparatus includes a communication unit, an audio codec, a sound unit and a clock unit. The audio codec is coupled to the communication unit. The sound unit is coupled to the audio codec. The clock unit is coupled to the communication unit. The communication unit is configured for wirelessly receiving and broadcasting audio data. The audio codec is configured for decoding the audio data and generating an analog signal according to the decoded audio data. The sound unit is configured for transforming the analog signal into an acoustic wave. The clock unit synchronizes with at least one other speaker apparatuses by a synchronous signal.

Abstract: The present disclosure illustrates a multi-systems integrated modulation module. The modulation module includes a first modulation circuit and a second modulation circuit. The first modulation circuit includes a high frequency oscillator and high frequency mixers. The second modulation circuit includes a low frequency oscillator and low frequency mixers. The second modulation circuit couples to the first modulation circuit. The high frequency mixers couple to the high frequency oscillator and the low frequency mixers couple to the low frequency oscillator. The high frequency mixers and the low frequency mixers provide high frequency signals and low frequency signals separately. The frequency mixers mix radio frequency signals with the high frequency signals or low frequency signals. The modulation module forms a first signal path by the first modulation circuit, and forms a second signal path by the first modulation circuit and the second modulation circuit.

Abstract: An electrostatic discharge protection device is disclosed. The electrostatic discharge protection device comprises a N+ well, a P doping region, a first N doping region, a plurality of N sub-doping regions, a first N+ doping region, a first P+ doping region, a second N+ doping region, and a second doping region. The P doping region is disposed in the N+ well. The first N doping region is disposed in the P doping region. The plurality of N sub-doping regions is disposed in parallel in the P doping region. The first N+ doping region is disposed in the first N doping region. The first P+ doping region is disposed in the first N doping region. The second N+ doping region is disposed in the P doping region.

Abstract: A voltage generator is disclosed. The voltage generator includes an operational amplifier, an offset voltage tuner, and an output stage circuit. The operational amplifier receives an input voltage and adjusts an offset voltage of the operating amplifier according to a control signal. The offset voltage tuner provides the control signal. The output stage circuit generates an output voltage according to a voltage on an output terminal of the operational amplifier, and provides the output voltage to the operational amplifier.

Abstract: The present invention provides a blue-tooth communication system and broadcasting methods thereof. The broadcasting method includes: firstly, detecting N blue-tooth receivers in a blue-tooth range of a blue-tooth transmitter, wherein N is a positive integer; and broadcasting a data package by the blue-tooth transmitter in a first transmission timing window; then respectively receiving N acknowledgement packages from the blue-tooth receiver by the blue-tooth transmitter in a plurality of reception timing windows.

Abstract: The present disclosure illustrates a multi-systems integrated modulation module. The modulation module includes a first modulation circuit and a second modulation circuit. The first modulation circuit includes a high frequency oscillator and high frequency mixers. The second modulation circuit includes a low frequency oscillator and low frequency mixers. The second modulation circuit couples to the first modulation circuit. The high frequency mixers couple to the high frequency oscillator and the low frequency mixers couple to the low frequency oscillator. The high frequency mixers and the low frequency mixers provide high frequency signals and low frequency signals separately. The frequency mixers mix radio frequency signals with the high frequency signals or low frequency signals. The modulation module forms a first signal path by the first modulation circuit, and forms a second signal path by the first modulation circuit and the second modulation circuit.

Abstract: A low dropout voltage regulator is provided. The low dropout voltage regulator includes a comparison unit, a buck unit, a feedback unit and a current-drawing unit. The comparison unit is used for receiving a reference voltage and a feedback voltage, and comparing the reference voltage and the feedback voltage to output a first voltage. The buck unit is used for receiving an input voltage and the first voltage and transferring the input voltage to a output voltage. The feedback unit is used for receiving the output voltage, and converting the output voltage to a feedback voltage, and then transmitting the feedback voltage to the comparison unit. The current-drawing unit determines whether to draw a portion of a first current generated by the buck unit, so as to stabilize the output voltage.

Abstract: The present invention provides a headphone apparatus and a headphone driving apparatus thereof The headphone driving apparatus includes a first and second driving circuits, a signal transmitting circuit, a first and second reference signal generators. The first driving circuit receives a first audio signal pair and generates a first driving signal. The second driving circuit receives a second audio signal pair and generates a second driving signal. The signal transmitting circuit transmits the first audio signal pairs or the reference signal to the first output end pair. The signal transmitting circuit decides to transmit the second audio signal pairs to the second output end pair or not according to the mode selecting signal. The second reference signal generator receives signals and generates the second reference signal. Wherein, the first and second reference signal generators are turned off according to the mode selecting signal.

Abstract: A voltage generating apparatus is provided. The voltage generating apparatus includes a reference voltage generator and an output voltage generator. The reference voltage generator is used for generating a reference voltage, and the reference voltage generator decides to generate the reference voltage or not according to a control signal. The output voltage generator includes a comparator, a variable resistor and a current source. The comparator compares the reference voltage and an output voltage to generator a calibrating signal. A resistance of the variable resistor is decided by the calibrating signal. The current source provides an output current to flow through the variable resistor for generating the output voltage. Wherein, the reference voltage is generated during an initial timing period, and the generator is turned off after the initial timing period. The initial timing period is determined according to the control signal.

Abstract: The voltage generator provided by the present invention includes: a first current source, a second current source, a first resistor, a reference voltage generator, a first amplifier and a second amplifier. The first current source generates a first current and a second current with a first temperature coefficient according to a first bias voltage. The second current source generates a third current and a fourth current with a second temperature coefficient according to a second bias voltage. The reference voltage generator provides a first reference voltage and a second reference voltage according to the first and third currents. The first amplifier generates the first bias voltage according to the first and second reference voltages. The second amplifier generates the second bias voltage according to the second and third reference voltages. Wherein, the first temperature coefficient and the second temperature coefficient are complementary.

Abstract: The present invention relates to an adaptive, high cost-performance efficient, and power-saving receiving method used for wireless communication systems, such as but not limited to Bluetooth (BT) system, in particular to a method which can detect the presence or absence of the adjacent channel interference (ACT) before the scheduled starting time for receiving a Bluetooth packet, and accordingly set the receiver configurations including the filter's pass-band bandwidth (BW), filter's order, the sampling rate or the number of analog-to-digital-converter (ADC) output bits, and the automatic-gain-control (AGC) algorithm to determine the low noise amplifier (LNA) and variable gain amplifier (VGA) settings.

Abstract: The present invention relates to an adaptive, cost-performance efficient, power-saving apparatus for wireless communication systems, such as but not limited to Bluetooth (BT) receivers, and in particular to a packet-based receiver's decoding algorithm which can detect the presence or absence of the adjacent channel interference (ACI) before the scheduled starting time for receiving a Bluetooth packet, and accordingly set the receiver configurations including the filter's pass-band bandwidth (BW), filter's order, the sampling rate, the number of analog-to-digital-converter (ADC) output bits, and the automatic-gain-control (AGC) algorithm unit to determine the low noise amplifier (LNA) and variable gain amplifier (VGA) settings.

Abstract: The present invention discloses a battery powered apparatus with the circuit of integrated power management and charger unit. It mainly comprises a power management and charger unit, a battery powered device, a battery and an adaptor. By integrating the charger unit, the power switch and the programmable current source to the micro-processor, the micro-processor can properly control the power supplied from the adaptor to the battery under the charging mode operation, which further derives a smoother curve of charging current.

Abstract: The present invention discloses apparatus and method for fast and robust automatic gain control (AGC). By using the power statistics and/or the amplitude statistics of multiple pairs of signed ADC outputs, the additional gain control can be determined and included in a statistics-aided AGC to successfully complete the AGC function for a received signal having a dynamic range up to 100 dB within a few micro-seconds.

Abstract: A wireless signal transceiving apparatus is provided. The wireless signal transceiving apparatus includes a signal transceiving-end circuit, a transceiving amplify module, an output amplify module, a mixer, a frequency selecting filter, switch modules a first base-band signal transceiver and a second base-band signal transceiver. The transceiving amplify module receives and amplifies a signal from an antenna or the mixer. The output amplify module amplifies the signal from the mixer. The frequency selecting filter filters the signal from the mixer, the first base-band signal transceiver or the second base-band signal transceiver according to the mode selecting signal. The first base-band signal transceiver and the second base-band signal transceiver receive the signal generated by the frequency selecting filter and/or respectively transmit the first and the second base-band output signal. The switch modules turn on or turn off transmission paths for the signal according to the mode selecting signal.

Abstract: The present invention discloses an apparatus and method for power-saving switch on a pair of configurable analog-to-digital converters. The apparatus mainly comprises an antenna, an antenna switch, a zero-IF RF receiver, and a baseband demodulator. By using a first and a second control signal to control the ON/OFF states of a plurality of switches and a plurality of stage units in the configurable analog-to-digital converters, and the third control signal to control the ON/OFF states of a plurality of LNA stages and the gain of a plurality VGAs, the power saving of the analog-to-digital converter is easily achieved.

Abstract: A power on reset signal generating apparatus is provided. The power on reset signal generating apparatus includes a trigger capacitor, a reference current supplying circuit, and a current regulator. One end of the trigger capacitor is coupled to a ground voltage, and the other end of the trigger capacitor generates a power on reset signal. The reference current supplying circuit is coupled to a signal generating end. The current regulator is coupled to the signal generating end, and the signal generating end draws a splitting current to adjust the value of the current received by the trigger capacitor.

Abstract: An oscillator is provided and includes a resistance unit, a capacitance unit, a first inverter and a second inverter. The resistance unit is serially connected between a first reference point and a second reference point. The capacitance unit is coupled between the first reference point and an output point, and includes capacitors. One terminal of each of the capacitors is coupled to the output point, and the other terminal of each of the capacitors is coupled to the first reference point or a reference ground according to a control signal. The input terminal of the first inverter is coupled to the first reference point, and the output terminal of the first inverter is coupled to the second reference point. The input terminal of the second inverter is coupled to the output terminal of the first inverter, and the output terminal of the second inverter is coupled to the output point.

Abstract: An acquisition scheme is provided for receiving a Bluetooth basic data rate (BDR) or enhanced data rate (EDR) packet. An acquisition apparatus for a Bluetooth receiver includes: a phase differentiator; a plurality of basic building blocks; a plurality of 1-bit switches; and a correlation computation equation. It features an acquisition circuit implementation with 1-bit correlator hardware shared by access code and EDR synchronization sequence correlation computations.

Abstract: A radio communication transceiver includes a transformer, a switch, a power amplifier (AP), and a low noise amplifier (LNA). The transformer has a primary winding and a center-tap secondary winding, the primary winding has a first endpoint and a second endpoint, and the center-tap secondary winding has a first endpoint, a second endpoint, and a third endpoint. The switch has a gate, a drain, and a source, in which the gate receives a control signal (CS), the drain is connected to the second endpoint of the primary winding of the transformer through a coupling capacitor, and the source is grounded. The PA has at least one output terminal connected to the first endpoint and the second endpoint of the center-tap secondary winding of the transformer. The LNA has an input terminal connected to the second endpoint of the primary winding of the transformer.