Abstract: A method of calibrating coexistence of several wirelessly communicating sub-systems within a wireless device wherein the wirelessly communicating sub-systems comprise several transmitters and several receivers which are interconnected through one or more interfaces, the method comprising:—activating one of the transmitters while maintaining the other transmitters off by causing said transmitter to transmit a first signal with a known set of characteristics;—measuring unwanted signal received at each receiver and originating from a coupling of said receivers with the activated transmitter;—storing coupling data derived from each of the measured unwanted signals in relation with the set of signal characteristics of the first signal and/or a set of unwanted signal characteristics, whereby forming a calibration database for adjusting operation of one or more transmitters and/or receivers to manage the coexistence of the plurality of wirelessly communicating sub-systems during normal operation of the wireless devi

Abstract: There is described a method of and a wireless mobile station for performing a beacon scanning of wireless Access Points, APs, in a wireless local area network, WLAN, the wireless mobile station comprising:—a unit configured for entering a low power mode of beacon scanning in which a beacon signal detection unit is active and a signal decoding unit is not active;—a unit configured for scanning simultaneously a set of channels;—a unit configured for recording within a list information regarding time of presence of beacon signal power;—a unit configured for leaving the low power mode of beacon scanning and activating the decoding unit responsive to presence of beacon signal power having been detected; and,—a unit configured for decoding the detected channels.

Abstract: A method of calibrating coexistence of several wirelessly communicating sub-systems within a wireless device wherein the wirelessly communicating sub-systems comprise several transmitters and several receivers which are interconnected through one or more interfaces, the method comprising:—activating one of the transmitters while maintaining the other transmitters off by causing said transmitter to transmit a first signal with a known set of characteristics;—measuring unwanted signal received at each receiver and originating from a coupling of said receivers with the activated transmitter;—storing coupling data derived from each of the measured unwanted signals in relation with the set of signal characteristics of the first signal and/or a set of unwanted signal characteristics, whereby forming a calibration database for adjusting operation of one or more transmitters and/or receivers to manage the coexistence of the plurality of wirelessly communicating sub-systems during normal operation of the wireless devi

Abstract: A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) are steered to a dummy load, a mixer for a first band, and at least one other mixer for a second band. The mechanism is structured to selectively apportion a current input signal between multiple paths of the same polarity having respective load circuits and concurrently steer different proportions of the current input signal to a dummy load path and at least one mixer path.

Abstract: A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) are steered to a dummy load, a mixer for a first band, and at least one other mixer for a second band. The mechanism is structured to selectively apportion a current input signal between multiple paths of the same polarity having respective load circuits and concurrently steer different proportions of the current input signal to a dummy load path and at least one mixer path.

Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Abstract: A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) may be steered to a dummy load (103), a mixer for a first band (106), and a mixer for a second band (108). In one example, five different loads are provided, one dummy load (103) and two different loads (105, 107) for each band. Possibilities include: 1. All current steered into dummy load via transistor A; 2. All current steered into Band 1 mixer via transistor B; 3. All current steered into a Band 1 mixer via transistor C, causing 6 dB input signal amplification; 4. All current steered into Band 2 mixer via transistor E; 5. All current steered into a Band 2 mixer via transistor D, causing 6 dB input signal amplification; 6. Like cases 2-5 but with diversion of some portion of current via a dummy load for attenuation of input signal in 1 dB steps.

Abstract: A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) may be steered to a dummy load (103), a mixer for a first band (106), and a mixer for a second band (108). In one example, five different loads are provided, one dummy load (103) and two different loads (105, 107) for each band. Possibilities include: 1. All current steered into dummy load via transistor A; 2. All current steered into Band 1 mixer via transistor B; 3. All current steered into a Band 1 mixer via transistor C, causing 6 dB input signal amplification; 4. All current steered into Band 2 mixer via transistor E; 5. All current steered into a Band 2 mixer via transistor D, causing 6 dB input signal amplification; 6. Like cases 2-5 but with diversion of some portion of current via a dummy load for attenuation of input signal in 1 dB steps.

Abstract: The circuit arrangement has a sigma-delta converter (2) for converting an analog input signal into a digital output signal. The sigma-delta converter (2) contains a loop filter, a comparator connected downstream of the latter and a feedback loop to feed the output signal back to the input signal. To reduce idle tones a dither signal is fed to the comparator by means of a dither-signal line (27.1). The dither signal is not however generated by a complex dither-signal generator. Instead, what is used as a dither signal is a signal that is available in the circuit but is not specifically generated for this purpose, e.g. an output signal from a second sigma-delta converter (2?). The circuit arrangement is thus simpler and less expensive than conventional circuit arrangements without its reduction of idle tones suffering.

Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Abstract: The circuit arrangement has a sigma-delta converter (2) for converting an analog input signal into a digital output signal. The sigma-delta converter (2) contains a loop filter, a comparator connected downstream of the latter and a feedback loop to feed the output signal back to the input signal. To reduce idle tones a dither signal is fed to the comparator by means of a dither-signal line (27.1). The dither signal is not however generated by a complex dither-signal generator. Instead, what is used as a dither signal is a signal that is available in the circuit but is not specifically generated for this purpose, e.g. an output signal from a second sigma-delta converter (2?). The circuit arrangement is thus simpler and less expensive than conventional circuit arrangements without its reduction of idle tones suffering.

Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Abstract: In a sigma-delta modulator the feedback circuit (4, 5) has an adjustable feedback factor controlled by an adjusting member (6) for adjusting the feedback factor of the feedback circuit.

Abstract: In a frequency synthesizer with a phase locked loop a charge pump (2) is present with an idle path (5-C, 6-C, 7, 8). The idle path (5-C, 6-C, 7, 8) is activated only shortly before an up or down pulse appears at an output (15, 16) of a phase frequency detector (1) and the idle path (5-C, 6-C, 7, 8) is disabled shortly after the disappearance of an up or down signal. Means (20) to generate a signal for controlling the enablement and disablement of the idle path (5-C, 6-C, 7, 8) may comprise a down-counter divider (30) or a zipper divider (35).

Abstract: Semiconductor chip comprising a high frequency (RF) circuit (2) and a chip being provided with a plurality of bonding pads (4) and an on chip electric static discharge protection (ESD) circuit (3), in which chip each circuit (2, 3) is connected with a separate bonding pad (4), an inductive connection being provided between said pads (4).

Abstract: In a sigma-delta modulator the feedback circuit (4, 5) has an adjustable feedback factor controlled by an adjusting member (6) for adjusting the feedback factor of the feedback circuit.

Abstract: In a frequency synthesizer with a phase locked loop a charge pump (2) is present with an idle path (5-C, 6-C, 7, 8). The idle path (5-C, 6-C, 7, 8) is activated only shortly before an up or down pulse appears at an output (15, 16) of a phase frequency detector (1) and the idle path (5-C, 6-C, 7, 8) is disabled shortly after the disappearance of an up or down signal. Means (20) to generate a signal for controlling the enablement and disablement of the idle path (5-C, 6-C, 7, 8) may comprise a down-counter divider (30) or a zipper divider (35).

Abstract: A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal containing a measure which is proportional to said detected phase difference, and having capacitor means for providing the detector output signal whose measure depends instantaneously on said detected phase difference.This allows a loop filter which is present in a phase locked loop to have reduced averaging properties and to have a broader bandwidth resulting in a cleaner output frequency signal of a voltage controlled oscillator in the phase locked loop.