Winbond Electronics Corporation

Issc Technologies Corp.

Hsiang-Te Ho

Peng-Sen Chen

Jeng-Hong Chen

Kuang-Hu Huang

Chin-Chang Chang

Zhi-Qing Huang

Hsing-Ya Chiang

Sheau-Chien Wang

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.

Method used for providing an adaptive receiving in wireless communication

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.

Adaptive wireless communication receiver

An adaptive receiver for receiving a radio frequency (RF) signal and converting the RF signal at an RF frequency Ftoward a low intermediate frequency Fis disclosed. The adaptive receiver comprises a pair of band pass filters with a nominal center frequency Fequal to F, a look-up table (LUT) configured to estimate a frequency offset &#x394;, representing the center frequency of the band pass filter due to an operating temperature change and/or process variation, a micro controller configured to estimate the operating center frequency of the band pass filter (=F+&#x394;with the frequency offset included) and use this new center frequency as the adaptive intermediate frequency F, and a local oscillator generates oscillating signals at a frequency Fequal to Fminus F. A temperature sensing device may also be included in this adaptive receiver.

Adaptive receivers

A direct digital synthesizer (DDS) for generating a waveform output according to a frequency input and a clock signal is provided. The direct digital synthesizer includes: a code generator for generating a digital code in response to the frequency input and the clock signal, a digital-analog converter (DAC) electrically connected with the code generator and comprising plural difference weighted coefficients for generating an analog waveform through an operation of the plural difference weighted coefficient and the digital code, and a filter electrically connected with the difference weighted digital-analog converter (DAC) for filtering the analog waveform to generate the waveform output. The provided direct digital synthesizer is able to generate all kinds of periodic waveforms with different phases without the conventional wave lookup ROM-table.

Direct digital synthesizer

A GFSK (Gaussian Frequency Shift Keying) radio transceiver is provided for ISM (Industrial Scientific and Medical) wideband communication. The GFSK radio transceiver includes a transmitter for modulating transmitted signal into RF signal, and a receiver for demodulating received signal into digital form. The transmitter includes a VCO for generating an oscillating signal serving as a carrier signal in the transmitter and a first local oscillating signal in the transmitter; and a variable-gain power amplifier, capable of being adjustable between two gain values, for amplifying the RF signal. The receiver includes a mixer for downconverting the received signal into a first IF signal by using the first local oscillating signal from the transmitter; and an IF demodulator for downconverting the first IF signal into a second IF signal by using a locally generated second local oscillating signal. The GFSK radio transceiver can operate either in half-duplex mode or full-duplex mode in a time-division duplex (TDD) system through micro-processor controls. Further, it utilizes a variable-gain power amplifier that can improve the drawbacks of interference and high power consumption with the prior art, and further utilizes a single wideband VCO to generate an oscillating signal that can be used both as the carrier signal in the transmitter and the first local oscillating signal for the receiver. This allows the GFSK radio transceiver to be implemented with a fewer number of VCOs as compared to the prior art, thus reducing the manufacturing cost.

Gaussian frequency-shift keying transciever for ISM wideband communication

A device and method for digitizing a RSSI signal in a wireless transmission system is disclosed, which comprises a micro-controller having a ring counter and a controller, a low-pass filter, and a comparator. To start a digitization process, the controller gradually increases a numeric control signal to control a ring counter to generate a square wave with different duty cycle. Subsequently, the square wave is filtered by a low-pass filter to obtain a DC threshold voltage. If the threshold voltage is larger than the RSSI voltage, the digitization process is complete and the final numeric control signal represents the digitized RSSI signal.

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Hsinchu, Taiwan

Hsiang-Te Ho