Abstract: A positioning method using global positioning system (GPS) signal and digital broadcasting system (DBS) signal. The method includes detecting a presence status of the GPS signal through a signal detector in a receiver, detecting a presence status of the DBS signal through the signal detector, determining the signal strength of the GPS signal if the GPS signal is detected, determining the signal strength of the DBS signal if the DBS signal is detected, choosing one positioning mode among a plurality of positioning modes in a signal processing unit in the receiver based on signal presence status and the signal strength of a detected signal, and determining a location of the receiver based on the chosen positioning mode. The plurality of positioning modes includes stand-alone GPS mode, assisted GPS (AGPS) mode, assisted GPS positioning with DBS assist mode, DBS positioning with GPS assist mode, stand-alone DBS mode, and assist DBS mode.

Abstract: A data packets distributor for transferring a data packet from a source address to a destination address is provided. The data packet distributor has a plurality of predefined addresses and a data packet distributing unit. Each of the plurality of addresses indicates a network processing unit coupled to the data packet distributing unit. The data packet distributing unit is capable of forwarding a data packet to at least one of the plurality of predefined addresses for processing by using a first Network Address Translation (NAT) operation and further capable of forwarding the data packet to the destination address by using a second Network Address Translation (NAT) operation.

Abstract: An exhaust emission data processing system for inspecting automatically exhaust emission of the vehicle and wirelessly transmitting exhaust emission inspection data to a remote server is provided. The system includes an exhaust emission processing module, a wireless connection module, and a remote server. The exhaust emission processing module receives OBD data indicating the exhaust emission inspection data from an OBD system embedded in the vehicle via an OBD connector. The exhaust emission processing module creates an exhaust emission inspection package with the vehicle identification and the exhaust emission inspection data. The exhaust emission processing module transmits the package to the remote server for further diagnosis through the wireless connection module. The remote server sends the diagnosis reports back to the vehicle through the wireless connection module.

Abstract: The present invention provides a flexible light emitter driver circuit which adjusts the luminance of the light emitter diodes (LED) by a manual input signal. The light emitter driver circuit comprises a Duty Ratio Change Logic, a PWM Generate and Control Logic, an oscillator, and a gate driver. The Duty Ratio Change Logic adjusts the duty cycle of the output signal according to the manual input signal. The PWM Generate and Control Logic generates a PWM signal according to the output signal to control the current of the LED, thus adjusts the luminance of the LED. The present invention further provides a highly flexible display system that comprises a light emitter driver circuit which can adjust the LED luminance by manual input signal.

Abstract: Battery protection circuitry and method are disclosed. A battery is protected from a large current overdrawn condition by setting a discharge switch into a controllable conduction state. After the discharge switch is in the controllable conduction state, a tickle discharge current is gradually generated under control of a switch control signal. The trickle discharge current can be used to determine whether the large current overdrawn condition still exists. When the large current overdrawn condition is removed, the discharge switch is turned back on.

Abstract: A variable gain amplifier (VGA) circuit and an automatic gain control (AGC) method thereof are disclosed. The VGA circuit includes an amplifier circuit and an AGC circuit. The amplifier circuit amplifies an input signal to an output signal according to a predetermined gain and the AGC circuit is connected to the amplifier circuit for regulating the predetermined gain. The AGC circuit further includes a peak detector detecting a peak of the output signal, a replica of the peak detector for detecting a peak of a reference signal, and a comparator for comparing the peak of the output signal with the peak of the reference signal to provide a control signal and then providing the control signal to the amplifier circuit to regulate the predetermined gain.

Abstract: A protection device for non-common ground buses is disclosed. The protection circuit includes a controller, a level shifter, a first group of switches, and a second group of switches. The controller together with the level shifter controls the first group and second group of switches. The non-common ground buses will be isolated when at least one group of the switches are turned off in an abnormal condition.

Abstract: A method for estimating signal quality of a spread spectrum signal is provided. The method includes squaring a plurality of in-phase correlation results and a plurality of quadrature correlation results, summing each squared in-phase correlation result and the corresponding correlation result to obtain a plurality of sum-of-square values, detecting a peak value among the plurality of sum-of-square results, calculating an average of non-peak values among the plurality of sum-of-square results. The peak value is regarded as a signal power value, while the averaged non-peak values are regarded as an average noise power value. A signal-to-noise ratio is then calculated based on the signal power value and the average noise power value. A method for determining the parameters for the tracking loop is also provided. The method includes estimating the signal-to-noise ratio of the spread spectrum signal, and determining the tracking loop parameters based on the signal-to-noise ratio.

Abstract: An analog to digital converter (ADC) with interference rejection capability and method thereof are disclosed. The ADC includes a threshold generator, a comparator circuit, a counter and an integrator. By comparing a signal with positive and negative threshold signals from the threshold generator, the comparator circuit converts the signal from analog to digital based on the result of the comparison. The counter counts a percentage of the digital signal and generates a bit signal based on the counted percentage. In response to the bit signal, the integrator supplies a control signal to the threshold generator to regulate the positive and negative threshold signals so as to maintain the counted percentage at a predetermined percentage threshold.

Abstract: A method for efficiently charging a battery. The method includes producing a first signal having a voltage level dependent on the voltage of the battery, comparing the voltage level of the first signal with a settable voltage representative of a maximum battery charging current, and producing a second signal representative of a charging current to be provided to the battery, the second signal having a voltage level selected to be the lower voltage level between the first signal and the settable voltage.

Abstract: A method and system for measuring the remaining capacity of a battery with open circuit voltage detection is disclosed. The method includes the steps of measuring an open circuit voltage, obtaining an initial capacity based on the open circuit voltage, initializing an accumulation counter with the initial capacity, adjusting the accumulation counter, and obtaining the remaining capacity based on the accumulation counter. The method further includes the step of calibrating the accumulation counter to eliminate accumulated error and offset resulting from the previous operation of adjusting the accumulation counter.

Abstract: An apparatus for processing spread spectrum signals digitized at a predetermined sampling frequency. The apparatus includes an intermediate frequency signal preprocessing unit, a plurality of parallel block integrators. The intermediate frequency signal preprocessing unit is capable of generating pre-integration results based on an input signal and local reference signals at a predetermined rate. The pre-integration results produced by the intermediate frequency signal preprocessing unit are grouped into sets of pre-integration results. Each set of the pre-integration results contains a predetermined number of pre-integration results. The plurality of parallel block integrators is in communication with the intermediate frequency signal preprocessing unit.

Abstract: The present invention is a battery fuel gauge circuit for measuring the capacity of a battery pack. The battery fuel gauge circuit includes an amplifier circuit, a correction circuit, a plurality of comparators, and a multiplexer. The amplifier circuit can sense a discharge current flowing through a sense resistor and a variable temperature from the battery pack and generate a first and a second voltage signals, which are corrected by the correction circuit and compared with a reference voltage by the plurality of comparators. After correction and comparison, the multiplexer can transmit the compared signals to an external indicating circuit that controls the display of the capacity of the battery pack.

Abstract: A method for processing spread spectrum signals through a two step integration process in a circuit having an intermediate frequency signal preprocessing unit and a plurality of block integrators, wherein the circuit receiving a digitized signal, a local reference signal, and a pseudorandom noise code. The method includes generating a plurality of data streams by the intermediate frequency signal preprocessing unit using the digitized signal and the reference signal, receiving at each block integrator a data stream from the plurality of data streams and the pseudorandom noise code, performing a predetermined number of partial correlations at each block integrator using hybrid correlation technique based on the data stream and the pseudorandom noise code to obtain a predetermined number of partial correlation results, and computing a predetermined number of complete correlation results based on the predetermined number of partial correlation results.

Abstract: A variable frequency multi-phase oscillator for providing multi-phase signals is disclosed. The variable frequency multi-phase oscillator includes a correlator, a plurality of delay cells, and a NOR circuit. Each delay cell includes a current supply, a capacitor, a comparator, a switch, and a logic unit. The plurality of delay cells generate the multi-phase signals that are phase correlated within a large frequency range. The frequency and duty cycles of the multi-phase signals are adjustable.

Abstract: The present invention is a telecommunication device with an auto-configurable capability that supports both serial and parallel data interfaces. The telecommunication device can transfer configuration data through a serial interface such as I2C interface and a parallel interface such as UPI. The telecommunication device can auto-configure through the I2C interface in master mode. The selectable configuration data stored in a second memory device is fetched by the telecommunication device through the I2C interface.

Abstract: The present invention is a DC/AC inverter for converting a DC supply voltage signal to an AC voltage signal. The DC/AC inverter includes a drive circuit, a switch circuit, a transformer circuit and an auxiliary circuit. The drive circuit provides a first drive signal and a second drive signal. The switch circuit includes a high-side transistor for receiving the first drive signal from the drive circuit and a low-side transistor for receiving the second drive signal from the drive circuit. The switch circuit further receives the DC supply voltage signal and generates a voltage signal. The transformer circuit receives the voltage signal from the switch circuit and transforms it to the AC voltage signal. The auxiliary circuit adjusts a gate-source voltage of the high-side transistor and thus enables the DC/AC inverter to be applicable to a wide DC voltage supply range.

Abstract: A current-mode DC-to-DC converter operating in a high frequency is disclosed. The current-mode DC-to-DC converter includes an inductor, a power switch, an oscillator, an adder without internal feedback loop, an error amplifier, a comparator, a compensation unit and a driver. The adder adds a ramp signal from the oscillator directly to a voltage signal relative to a current flowing through the power switch and generates a sum signal based upon match between internal components in the oscillator and the adder.

Abstract: A power management device for enabling multiply power sources to supply power to a load. The power management device includes a plurality of switches and a control logic. The plurality of switches are coupled to a plurality of power sources respectively and each switch coupled to each power source. The control logic is capable of selecting a set of switches among the plurality of switches to cooperate in a time-divided fashion to allow the power sources to provide power to the load. The set of switches is selected based on an electrical requirement of the load and an electrical condition of each switch.

Abstract: A tunable band pass filter is provided. The tunable band pass filter includes a band pass filter and a plurality of switches coupled to the band pass filter. The band pass filter includes a plurality of transconductors and a plurality of capacitors. The tunable band pass filter can be configured as a complex band pass filter or as a tuning device for tuning the center frequency of the complex band pass filter depending on the operation of the plurality of switches. The tuning device includes at least one tuning integrator and a comparator. The tuning integrator includes at least one transconductor and a capacitor. The transconductor is selected via the plurality of switches from the plurality of transconductors and the capacitor is selected via the plurality of switches from said plurality of capacitors. The selected transconductor and the selected capacitor determinines the center frequency of the band pass filter.