Telefonaktiebolaget Lm Ericsson (publ)

St-ericsson Sa

Sven Erik Mattisson

Jacobus Cornelis Haartsen

Daniele Mastantuono

Leif Wilhelmsson

Bengt Lindoff

Paul Wilkinson Dent

Lars Sundström

Magnus Nilsson

Fenghao Mu

Pietro Andreani

Miguel Lopez

Andrej Litwin

Stefan Mikael Andersson

Dennis Sundman

Lars T Svensson

Roland Strandberg

Filip Oredsson

Hans Hagberg

William O Camp, Jr

Henrik Sjöland

Johan Nilsson

Fredrik Nordström

Thomas Nilsson

Mingquan Bao

Matthias Kamuf

Imad Ud Din

Staffan Ek

Fredrik Tillman

Tony Påhlsson

Thomas Olsson

Joakim Persson

Thomas Mattsson

Martin Anderson

Mattias Palm

H&aring;kan Eriksson

Jan Celander

Karl Håkan Torbjörn Gärdenfors

Robert Bristow

Peter Markenlöv

Magnus Wiklund

Tony Petersson

Jaap Haartsen

Bengt Edholm

Bj&ouml;rn Lindquist

William Camp

Hans Stattin

Christian Bjork

Jacobus Cornelius Haartsen

Andreas Mårtensson

Martin Lantz

Henrik Geis

Jonas Persson

Andreas Nydahl

Karl H&aring;kan Torbj&ouml;rn Johansson G&auml;rdenfors

Erik Carlberg

Christian Björk

Karl Håkan Torbjörn Johansson-Gardenfors

Michael Holmström

Karl H&aring;kan Torbj&ouml;rn Gardenfors

Björn Lindquist

Karl H Kan Torbjörn Gärdenfors

Karl Hakan Torbjörn Gärdenfors

Lars SUNDSTRÖM

Stefan Andersson

Anders WALLÉN

There is provided a power amplifier arrangement for amplifying an input power signal to an output power signal. The power amplifier arrangement comprises a main amplifier having an input and an output. The power amplifier arrangement comprises at least one auxiliary amplifier, each having an input and an output. The power amplifier arrangement comprises a power divider having an input and outputs. The input of the power divider is configured to receive the input power signal. Each output of the power divider is connected to a respective input of the power amplifiers. The power amplifier arrangement comprises a Doherty combiner comprising at least one Ruthroff transformer and configured to combine all the outputs of the power amplifiers to, at an output of the Doherty combiner, produce the output power signal.

Power amplifier arrangement comprising Ruthroff transformer

Embodiments include methods for a wireless communication device comprising a main receiver and a wake-up receiver (WUR) having a channel selective filter. Such methods include determining a correlation metric for the WUR, based on the following: a signal received via the WUR using the channel selective filter configured according to a first one of a plurality of available bandwidths, and a reference signal that is representative of a wake-up signal (WUS) transmitted by an access point node. Such methods include detecting a WUS included in the received signal based on the correlation metric in relation to a first threshold, and in response to detecting the WUS, selecting a second one of the available bandwidths for the channel selective filter, based on the correlation metric in relation to a second threshold. Other embodiments include complementary methods for an access point node, as well as apparatus configured to perform such methods.

Wake-up signal management

The invention relates to a method for a wireless communication apparatus, and such an apparatus, configured to use a wake-up signal (WUS), transmitted for waking up a main receiver of a wireless communication device responsive to detection of the WUS by a wake-up receiver (WUR) of the wireless communication device. The method comprises controlling a bandwidth associated with the WUS based on a reception condition metric for the WUR. Embodiments may comprise determining the reception condition metric for the WUR by correlating a received signal comprising the WUS with a WUS reference signal to provide an extreme correlation value, and determining the reception condition metric for the WUR based on the extreme correlation value. In some embodiments, controlling the bandwidth associated with the WUS based on the reception condition metric may comprise controlling a WUS bandwidth based on the reception condition metric. The wireless communication apparatus may be the wireless communication device or the access point.

In one aspect, a transmitting device may frequency-division multiplex a wake-up signature (WUS) targeted to a wake-up receiver (WUR) of a receiving device with user data targeted to a main transceiver of each of one or more other receiving devices into an output signal. The output signal is then transmitted. A receiving device having a WUR and a main transceiver of the receiving device detects, at the WUR, a WUS targeted for the WUR in a received signal. The WUS is frequency-division multiplexed with user data for one or more other receiving devices in the received signal. The receiving device wakes up the main transceiver in response to the detecting.

Efficient concurrent transmission of a wake-up signal and user data

The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency. A passive mixer for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency comprises a cancellation component for generating a first cancellation signal for cancelling second order intermodulation components by superimposing the first signal weighted by a cancellation value on the third signal; and a mixing component having a first terminal for receiving the first signal, a second terminal for outputting the second signal, and a third terminal for receiving the first cancellation signal, wherein the mixing component is adapted to provide the second signal as output at the second terminal by mixing the first signal provided as input at the first terminal and the first cancellation signal provided as input at the third terminal.

Passive mixer with reduced second order intermodulation

An oscillator circuit () for generating quadrature-related first and second oscillation signals having equal frequencies comprises a first oscillation circuit (VCO_I) configured to generate the first oscillation signal having a first controllable frequency, a second oscillation circuit (VCO_Q) configured to generate the second oscillation signal having a second controllable frequency; and a controller () configured to enable and disable oscillation of the first and second oscillation circuits (VCO_I, VCO_Q) and to control the first and second controllable frequencies, such that when the oscillation is enabled, the first and second controllable frequencies are controlled to be initially unequal and then to become equal.

Quadrature oscillator

An attenuator for attenuating a signal is disclosed. The attenuator comprises a differential input port with a positive input node and a negative input node to receive the signal; and a differential output port with a positive output node and a negative output node to output the attenuated signal. The attenuator further comprises a first switched resistor network connected between the positive input node and the positive output node; and a second switched resistor network connected between the negative input node and the negative output node. Further a pair of compensation paths is connected to the first and second switched resistor networks for cancellation their parasitic leakages, where a first compensation path is connected between the positive input node and the negative output node, and a second compensation path is connected between the negative input node and the positive output node. The attenuator further comprises a control circuit to generate control signals for controlling the first and second switched resistor networks.

Attenuator

The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency. A passive mixer for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency comprises a cancellation componentfor generating a first cancellation signal for cancelling second order intermodulation components by superimposing the first signal weighted by a cancellation value on the third signal; and a mixing componenthaving a first terminalfor receiving the first signal, a second terminalfor outputting the second signal, and a third terminalfor receiving the first cancellation signal, wherein the mixing componentis adapted to provide the second signal as output at the second terminalby mixing the first signal provided as input at the first terminaland the first cancellation signal provided as input at the third terminal

Systems and methods of noise suppression by an amplifier are presented. In one exemplary embodiment, an amplifier comprises first and fourth transistors configured as a first differential pair of transistors in a common-gate configuration, and second and third transistors configured as a second differential pair of transistors in a common-source configuration. The first and fourth transistors are operative to receive, from a differential input, by a source of each first and fourth transistor, a differential input signal. Further, a drain of each first and fourth transistor is coupled to respective first and second outputs configured as a differential output. The second and third transistors are operative to output, from a drain of each second and third transistor, to the respective second and first outputs, a differential output signal. Further, a gate of each second and third transistor is coupled to the respective first and second inputs.

Amplifier adapted for noise suppression

A quadrature phase detector circuit for a multi-antenna radio circuit comprising a plurality of frequency synthesizers using a common reference oscillator signal is disclosed. The quadrature phase detector comprises a first circuit arranged to collect a first state value indicating an inner state of a first quadrature signals generating frequency divider circuit of a first frequency synthesizer of the plurality of frequency synthesizers and a second state value indicating an inner state of a second quadrature signals generating frequency divider circuit of a second frequency synthesizer of the plurality of frequency synthesizers, a second circuit arranged to determine from the first state value and the second state value whether quadrature signals of the first frequency synthesizer and quadrature signals of the second frequency synthesizer are in-phase or out-of-phase, and a third circuit arranged to provide an output signal indicating whether the quadrature signals of the first frequency synthesizer and the quadrature signals of the second frequency synthesizer are in-phase or out-of-phase.

Quadrature phase detector circuit, quadrature phase corrector, multi-antenna radio circuit, radio station and method

A radio frequency receiver having a plurality of parallel receiving paths, wherein each path can receive a radio frequency signal in one of a plurality of radio frequency bands and amplify the received signal in a low noise amplifier. The amplified signals from the plurality of parallel paths are combined to one combined radio frequency signal in a common summation node and down-converted to a lower frequency signal in a mixer circuit. Each low noise amplifier comprises a low noise transconductance circuit providing a current signal to drive the common summation node, and an automatic gain control circuit in each path compensates for variations in signal strength independently of signal strengths of signals received by the other receiving paths. The receiver is suitable for simultaneous multiple band reception, where received signal strength can vary between the frequency bands.

Receiving a plurality of radio frequency bands

A mobile communications terminal comprising a radio frequency interface configured to operate at least at a first configuration, and a controller, wherein said controller is configured to determine that a reconfiguration of the radio frequency interface is to be performed, determine a timing of the reconfiguration and reconfigure said radio frequency interface to operate at a second configuration at the determined timing, wherein said controller is configured to determine said timing based on the type of reconfiguration to be made.

Timing for radio reconfiguration in a mobile communications network

An amplifier () adapted for noise suppression comprises a first input () for receiving a first input signal and a second input () for receiving a second input signal, the first and second input signals constituting a differential pair. A first output () delivers a first output signal and a second output () delivers a second output signal, the first and second output signals constituting a differential pair. A first transistor (M) has a first drain () coupled to the first output () such that all signal current, except parasitic losses, flowing through the first drain () flows through the first output (), and the first transistor (M) further having a first source () coupled to the first input (). A second transistor (M) has a second gate () coupled to the first input (), a second drain () coupled to the second output () such that all signal current, except parasitic losses, flowing through the second drain () flows through the second output (), and the second transistor (M) further having a second source () coupled to a first voltage rail (). A third transistor (M) has a third gate () coupled to the second input (), a third drain () coupled to the first output () such that all signal current, except parasitic losses, flowing through the third drain () flows through the first output (), and the third transistor (M) further having a third source () coupled to the first voltage rail (). A fourth transistor (M) has a fourth drain () coupled to the second output () such that all signal current, except parasitic losses, flowing through the fourth drain () flows through the second output (), and the fourth transistor (M) further having a fourth source () coupled to the second input (). A first load (Z) is coupled between the first output () and a second voltage rail (). A second load (Z) is coupled between the second output () and the second voltage rail (). A first inductive element (L) is coupled between the first input () and a third voltage rail (), and a second inductive element (L) is coupled between the second input () and the third voltage rail (). Transconductance of the first transistor (M) is substantially equal to transconductance of the fourth transistor (M), within &#xb1;5%, and transconductance of the second transistor (M) is substantially equal to transconductance of the third transistor (M), within &#xb1;5%.

Growing community of inventors

Bjärred, Sweden

Sven Erik Mattisson