Abstract: A PLL frequency generator is disclosed for generating an output signal with a settable target frequency, comprising a) a voltage-controlled oscillator for generating the output signal depending on a control voltage, b) a switchable frequency divider, which is connected to the voltage-controlled oscillator and is designed to derive a frequency-divided signal whose instantaneous frequency depends on a value of an adjustable divisor, from the output signal c) a switchable delay unit, which is connected to the frequency divider and is designed to generate a delayed signal in that the frequency-divided signal is delayed by delay times that in each case depend on a control word and a control signal, and d) a phase detector, which is connected to the switchable delay unit and is designed to determine the phase difference between a reference signal and the delayed signal and to provide it for the generation of the control voltage.

Abstract: A PLL frequency generator is disclosed for generating an output signal with a settable target frequency, comprising a) a voltage-controlled oscillator for generating the output signal, b) a switchable frequency divider, which is connected to the voltage-controlled oscillator and is designed to derive from the output signal a frequency-divided signal whose instantaneous frequency depends on a value of an adjustable divisor, c) a switchable delay unit, which is connected to the frequency divider and is designed to generate a delayed signal in that the frequency-divided signal is delayed by delay times that depend on a control word, and d) a controller connected to the switchable delay unit controller and designed to determine the control words. According to the invention, the controller has a sigma-delta modulator and is designed to determine the control words depending on at least one signal provided by the sigma-delta modulator.

Abstract: A WLAN transmitter capable of transmitting data signals modulated in accordance with an individual one of at least two different modulation schemes and corresponding methods and integrated circuit chips are provided. The WLAN transmitter contains a front end section having a low-IF topology and including a digital front end unit and an analog front end unit. The digital front end unit contains a first signal processing branch for processing transmission data signals modulated in accordance with a first one of said at least two different modulation schemes. The digital front end unit further contains a second signal processing branch for processing transmission data signals modulated in accordance with a second one of said at least two different modulation schemes. The analog front end unit contains one single signal processing branch for processing transmission data signals modulated in accordance with any one of said at least two different modulation schemes.

Abstract: A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.

Abstract: A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.

Abstract: A receiving circuit, use, and method for receiving in a radio network is provided, wherein switching is performed continuously between a first signal, which is received over a first antenna, and a second signal, which is received over a second antenna, to form an input signal. The input signal is converted analog/digitally into a digital signal, the digital signal is correlated to output a correlation signal, the correlation signal is compared with a threshold, and the switching for data reception in a current switch position is stopped when the correlation signal exceeds the threshold.

Abstract: A method for the transmission and use of a power amplifier and transmission circuit of a radio network is provided that includes a power amplifier, which is connectable to an antenna, a counter whose output is connected to a control input of the power amplifier to output a count value to control the amplification of the power amplifier, a register for storing a register value, a comparator whose inputs are connected to the output of the counter and the register for comparing the register value with the count value, and a control circuit whose input is connected to the comparator and whose output is connected to the counter to control a counting process depending on the comparison result of the comparator.

Abstract: A receiving circuit, method for receiving a signal, and use of a detection circuit and a control circuit of a receiving circuit of a node of a radio network is provided to deactivate an analog signal processing and/or determination of digital data from a signal received over an antenna of the node, when a stored current frame of the digital data has been recognized as valid, and to activate the analog signal processing and/or the determination, when the transmission of the current frame over an interface of the control circuit has been confirmed, whereby the control circuit is connected to the detection circuit and/or an input circuit for deactivation and activation, and whereby the detection circuit is formed to determine the digital data from the received signal.

Abstract: A frequency modulator is provided for generating an output signal with a frequency that is a function of a modulation signal, wherein the modulation signal can assume N?2 different discrete modulation values, and a predetermined frequency value of the output signal is associated with each modulation value, containing: a) a closed phase locked loop with a loop filter for providing a first control voltage, with a voltage controlled oscillator for generating the output signal, and with a switchable frequency divider for deriving a frequency-divided signal, and b) a modulation unit that is designed to provide, at a first output, values of a divisor that are a function of the modulation signal, and at a second output, a second control voltage that is a function of the modulation signal, c) wherein the oscillator has a first control input connected to the loop filter and has a second control input connected to the second output of the modulation unit, and is designed to generate the output signal as a function of t

Abstract: A method of transmitting information in a WLAN (Wireless Local Area Network) network and corresponding WLAN communication devices and integrated circuit chips are provided. A correction signal is used for compensating for a dc offset in a data signal containing at least part of the information to be transmitted. The correction signal is varied by making it taking different values. For each of the different values, a strength of an indicator signal indicative of the dc offset is determined. Based upon the determined strength, an optimum value of the correction signal is identified at which the dc offset is minimized. The value of the correction signal is set to the optimum value. Further, a method of transmitting information in a WLAN network is provided, including compensating for a first and second dc offset in a first and second data signal, respectively, using a first and second feedback loop, respectively.

Abstract: A WLAN (Wireless Local Area Network) transmission technique is provided where data is transmitted in two or more different transmission modes at different transmission rates. A transmission gain is determined to be applied when transmitting data. The transmission gain is determined to be transmission mode dependent such that the transmission gain in a first transmission mode is greater than the transmission gain in a second transmission mode if the transmission rate in the first transmission mode is lower than the transmission rate in the second transmission mode.

Abstract: A frequency modulator is provided for generating an output signal with a frequency that is a function of a modulation signal, wherein the modulation signal can assume N?2 different discrete modulation values, and a predetermined frequency value of the output signal is associated with each modulation value, containing: a) a closed phase locked loop with a loop filter for providing a first control voltage, with a voltage controlled oscillator for generating the output signal, and with a switchable frequency divider for deriving a frequency-divided signal, and b) a modulation unit that is designed to provide, at a first output, values of a divisor that are a function of the modulation signal, and at a second output, a second control voltage that is a function of the modulation signal, c) wherein the oscillator has a first control input connected to the loop filter and has a second control input connected to the second output of the modulation unit, and is designed to generate the output signal as a function of t

Abstract: A PLL frequency generator is disclosed for generating an output signal with a settable target frequency, comprising a) a voltage-controlled oscillator for generating the output signal, b) a switchable frequency divider, which is connected to the voltage-controlled oscillator and is designed to derive from the output signal a frequency-divided signal whose instantaneous frequency depends on a value of an adjustable divisor, c) a switchable delay unit, which is connected to the frequency divider and is designed to generate a delayed signal in that the frequency-divided signal is delayed by delay times that depend on a control word, and d) a controller connected to the switchable delay unit controller and designed to determine the control words. According to the invention, the controller has a sigma-delta modulator and is designed to determine the control words depending on at least one signal provided by the sigma-delta modulator.

Abstract: A PLL frequency generator is disclosed for generating an output signal with a settable target frequency, comprising a) a voltage-controlled oscillator for generating the output signal depending on a control voltage, b) a switchable frequency divider, which is connected to the voltage-controlled oscillator and is designed to derive a frequency-divided signal whose instantaneous frequency depends on a value of an adjustable divisor, from the output signal c) a switchable delay unit, which is connected to the frequency divider and is designed to generate a delayed signal in that the frequency-divided signal is delayed by delay times that in each case depend on a control word and a control signal, and d) a phase detector, which is connected to the switchable delay unit and is designed to determine the phase difference between a reference signal and the delayed signal and to provide it for the generation of the control voltage.

Abstract: A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.

Abstract: A digitally controlled filter tuning method and corresponding WLAN (Wireless Local Area Network) communication devices and integrated circuit chips are provided. A WLAN communication signal is filtered by a tunable filter. A cut-off frequency of the tunable filter is tuned by a feedback loop. Tuning the cut-off frequency includes comparing by a comparator an output signal emitted by the tunable filter to a reference signal and emitting by the comparator a comparator signal indicative of the difference between the output signal and the reference signal. Further, tuning the cut off frequency comprises receiving the comparator signal by a tuning controller and setting by the tuning controller the cut-off frequency of the tunable filter based on the comparator signal by applying a digital tuning word to the tunable filter. The described filter tuning technique may reduce product and manufacturing costs while providing enhanced tuning accuracy.

Abstract: A WLAN transmitter capable of transmitting data signals modulated in accordance with an individual one of at least two different modulation schemes and corresponding methods and integrated circuit chips are provided. The WLAN transmitter contains a front end section having a low-IF topology and including a digital front end unit and an analog front end unit. The digital front end unit contains a first signal processing branch for processing transmission data signals modulated in accordance with a first one of said at least two different modulation schemes. The digital front end unit further contains a second signal processing branch for processing transmission data signals modulated in accordance with a second one of said at least two different modulation schemes. The analog front end unit contains one single signal processing branch for processing transmission data signals modulated in accordance with any one of said at least two different modulation schemes.

Abstract: A digitally controlled filter tuning method and corresponding WLAN (Wireless Local Area Network) communication devices and integrated circuit chips are provided. A WLAN communication signal is filtered by a tunable filter. A cut-off frequency of the tunable filter is tuned by a feedback loop. Tuning the cut-off frequency includes comparing by a comparator an output signal emitted by the tunable filter to a reference signal and emitting by the comparator a comparator signal indicative of the difference between the output signal and the reference signal. Further, tuning the cut-off frequency comprises receiving the comparator signal by a tuning controller and setting by the tuning controller the cut-off frequency of the tunable filter based on the comparator signal by applying a digital tuning word to the tunable filter. The described filter tuning technique may reduce product and manufacturing costs while providing enhanced tuning accuracy.

Abstract: A method of transmitting information in a WLAN (Wireless Local Area Network) network and corresponding WLAN communication devices and integrated circuit chips are provided. A correction signal is used for compensating for a dc offset in a data signal containing at least part of the information to be transmitted. The correction signal is varied by making it taking different values. For each of the different values, a strength of an indicator signal indicative of the dc offset is determined. Based upon the determined strength, an optimum value of the correction signal is identified at which the dc offset is minimized. The value of the correction signal is set to the optimum value. Further, a method of transmitting information in a WLAN network is provided, including compensating for a first and second dc offset in a first and second data signal, respectively, using a first and second feedback loop, respectively.

Abstract: A WLAN (Wireless Local Area Network) transmission technique is provided where data is transmitted in two or more different transmission modes at different transmission rates. A transmission gain is determined to be applied when transmitting data. The transmission gain is determined to be transmission mode dependent such that the transmission gain in a first transmission mode is greater than the transmission gain in a second transmission mode if the transmission rate in the first transmission mode is lower than the transmission rate in the second transmission mode.