Nokia Corporation

Nokia Technologies Oy

Broadcom Corporation

Ari Vilander

Pete Sivonen

Sami Vilhonen

Marko Alanen

Liangge Xu

Mikael Svard

Jounl Kristian Kaukovuori

In one aspect there is an apparatus. The apparatus may include an electronic circuit that generates a first magnetic field from a current in the electronic circuit. The apparatus may further include a sensing circuit separated from the electronic circuit by a predetermined distance to sense the first magnetic field. A cage circuit may cancel a portion of the first magnetic field at the sensing circuit. The cage circuit may generate a cage current from the current in the electronic circuit and at least one of a phase shift or an amplitude shift applied to the current in the electronic circuit. The cage current may generate a second magnetic field causing cancellation of the portion of the magnetic field from the electronic circuit at the sensing circuit.

Low crosstalk magnetic devices

An apparatus and method for operating a frequency synthesizer wherein a value of an first control signal associated with a fine frequency feedback loop connected to a signal generator is monitored, and a second control signal associated with a medium or coarse frequency feedback loop connected to the signal generator is adjusted based on the monitoring. The first and second control signals are then output to control the frequency synthesizer.

Operating a frequency synthesizer

A filtering method, a transceiver and a transmitter are provided. The transmitter comprises a power amplifier amplifying an RF signal and having multiple stages, and a local oscillator, the power amplifier comprising between at least two stages of the power amplifier an impedance circuitry for forming an impedance at a frequency related to the frequency of the local oscillator, and a switch for switching the impedance of the impedance circuitry means to RF frequency.

Transmitter, power amplifier and filtering method

A transconductor input circuit for a down converting quadrature mixer stage of a direct-conversion receiver comprises a pair of common-gate input transistors whose source electrodes are coupled to a differential radio frequency (RF) input signal outputted from an interstage RF filter. The transconductor circuit further comprises a pair of equally-sized biasing transistors for biasing the pair of common-gate input transistors. Source electrodes of the biasing transistors are coupled to the source electrodes of the transistors to sense the differential radio frequency input signal for canceling intermodulation distortion.

RF input transconductor stage

The present invention relates to a resonator structure, temperature compensation method and temperature control apparatus for controlling local temperature of a resonator structure. At least one heating element () is integrated on a substrate of the resonator structure, and a temperature control signal generated based on a stored temperature characteristic is applied to the at least one integrated heating element (). Thereby, the at least one heating element () and an optional integrated sensing element can be provided very close to the resonator. It is thus possible to control or calibrate variations of sensing elements, heating elements and resonator out from every sample.

Acoustic wave resonator with integrated temperature control for oscillator purposes

A transconductor circuit includes a first input device Mand a second input device Meach having a control terminal coupled to a radio frequency input signal, and a bias setting device Mhaving a control terminal coupled to the radio frequency input signal and an output coupled to the control terminal of each of said Mand M. Mis partitioned into two equal sized bias setting devices Mand M. In the preferred embodiment Mand Mare coupled to the control terminals of Mand Mfor establishing a bias voltage at the control terminals of Mand M. The circuit is shown to substantially cancel second-order intermodulation distortion and to enhance a second order intercept point.

Method and apparatus providing cancellation of second order intermodulation distortion and enhancement of second order intercept point (IIP2) in common source and common emitter transconductance circuits

A resonant load circuit is disposed in an integrated circuit, where the resonant load circuit includes an integrated inductance in parallel with an integrated capacitance, and further includes a first integrated resistance Rin series with one of the inductance and capacitance, preferably in series with the inductance, and a second integrated resistance Rin parallel with the inductance and capacitance. The first and second integrated resistances have values selected for reducing an amount of resonant load circuit Q over a plurality of instances of the integrated circuit. In a preferred, but non-limiting, embodiment the resonant load circuit forms a load in an RF low noise amplifier, such as a balanced inductively degenerated common source low noise amplifier (LNA).

Gain stabilization technique for narrow band integrated low noise amplifiers

A method for forming a spiral inductor () or component of a transformer, compatible with very large scale integrated processing, that achieves a higher Q value without occupying more space by splitting at least one turn () as two or more crisscrossing or interwoven smaller-width turns (). The at least one turn () may, for example, be split into four turns paired up to provide two pairs of two turns, and the turns of each pair may then be interwoven or crisscrossed, and then the two pairs may also be interwoven or crisscrossed. The splitting of a turn into two or more smaller-width turns results in the current being divided among the smaller-width turns.

Method for forming a spiral inductor

Disclosed is an oscillator circuit ( A) for use in a local oscillator of an RF communications device ( ) that communicates over an RF channel. The oscillator circuit includes an oscillator circuit portion ( ) and a bias circuit portion ( ) coupled to the oscillator circuit portion for setting the operating point of the oscillator transistors. The oscillator circuit further includes a switch ( ) for selectively one of connecting or disconnecting the bias circuit portion from the oscillator circuit portion, and a capacitance ( ) for storing an output of the bias circuit portion during a time that the switch disconnects the bias circuit portion from the oscillator circuit portion, thereby maintaining control of the operating point of the oscillator transistors of the oscillator circuit portion. When the switch is open any noise generated by the biasing circuit portion is prevented from reaching the oscillator circuit portion, thereby reducing the overall noise floor of the oscillator circuit. The capacitance may have a value that is measured in tens of picofarads, and the oscillator circuit, including the capacitance, is formed within an integrated circuit.

Growing community of inventors

Kerava, Finland

Ari Vilander