Nxp B.v.

St-ericsson Sa

Integrated Device Technology, Inc.

Jan Van Sinderen

Nenad Pavlovic

Johannes Hubertus Antonius Brekelmans

Xin He

Gerben Willem De Jong

Dennis Jeurissen

Gerard Villar Piqué

Robert Rutten

Salvatore Drago

Manel Collados Asensio

Manel Collados

Lucien Johannes Breems

Frank Leong

William Redman-White

Rachid El Waffaoui

Ravichandra Karadi

Evert-Jan Pol

Melina Apostolidou

Sebastien Amiot

Luca Lococo

Johannes H A Brekelmans

Frank Harald Erich Ho Chung Leong

Peter Van De Haar

Vincent Rambeau

Wolfgang Hoess

Tjeu Van Ansem

Marc G M Notten

Johannes Brekelmans

Esa Petri Tarvainen

Francois Pichon

Francois Seneschal

Joerg Heinrich Walter Wenzel

Jacques Potier

Leonardus H M Hesen

Manuel Collados Asensio

Simon W K Lee

A method for power management for applications having duty-cycled high peak supply currents includes charging a buffer capacitor with a first current supplied by a battery, wherein the first current is limited by a current limiter. A load is supplied with a second current supplied by the buffer capacitor, wherein the second current comprises a pulsed current. The current limiter is controlled with at least one of a plurality of sensor inputs to limit a capacity degradation of the battery.

Power management for applications having duty-cycled high peak supply currents

The disclosure relates to an IQ mismatch correction module for a radio receiver, the IQ mismatch correction module comprising: an input terminal configured to receive an input signal; an output terminal configured to provide a filtered output signal; a mismatch detection module comprising: one or more bandpass filters configured to receive, from the input terminal or output terminal, a bandpass input signal and to pass a plurality of sub-bands of the bandpass input signal to provide respective bandpass filtered signals; one or more amplitude and phase mismatch detectors configured to determine amplitude and phase mismatch coefficients based on the bandpass filtered signals from the plurality of sub-bands; a transformation unit configured to apply a transformation to the amplitude and phase mismatch coefficients to provide correction filter coefficients for the plurality of sub-bands; and a filter module configured to: receive the filter coefficients for the plurality of sub-bands from the mismatch detection module; and filter the input signal in accordance with the received filter coefficients to provide the filtered output signal.

IQ mismatch correction module

A frequency converter, comprising a multi-phase local oscillator and a multi-phase mixer. The mixer comprises a plurality of mixer switches, each connected to a respective amplifier. The local oscillator is configured to provide a switching signal to each mixer switch, and comprises a plurality of inverters configured as a ring oscillator.

Frequency converter

An RF reception system and method uses IF quadrature mixing, in which there is further mixing and channel filtering in the digital domain, to isolate a frequency of interest. A coefficient estimator is used for generating a phase correction coefficient and an amplitude correction coefficient from filtered in-phase and quadrature desired signals and from filtered in-phase and quadrature image signals.

Coefficient estimation for digital IQ calibration

The invention relates to frequency conversion systems, in particular for use as up-converters or down-converters in radiofrequency (RF) receivers or transmitters, exemplary embodiments including a radiofrequency receiver including an RF signal input; a mixing module including a first plurality of IF amplifiers each connected to the RF signal input via a switch; a multi-phase local oscillator signal generator configured to provide a switching signal to each switch; and a summing module configured to receive output signals from each of the IF amplifiers and to provide a second plurality of output IF signals from a weighted sum of the IF amplifier output signals, wherein the second plurality is different to the first plurality.

Conversion system

A transconductance amplifier comprises a set of amplifier stages. The last stage of the amplifier is split with a certain ratio whereby one part is used to deliver output current and other part to deliver feedback current to the input.

Transconductance amplifier

An automatic gain control (AGC) circuit based on a cascade of a step automatic gain control unit and a second automatic gain control unit connected to adjust their gain in a synchronized manner to result in a combined impulsive gain variation. Hereby it is possible, e.g. to use a step automatic gain control unit instead of a continuous automatic gain control unit in an RF part of a TV tuner without resulting in visual artifacts&#x2014;this applies both for digital and analog TV tuners. According to a preferred embodiment, the synchronization between the two automatic gain control units may be achieved by the first automatic gain control unit generating a control signal upon gain adjustment, this control signal serving to speed up a loop bandwidth controlling gain change of the second automatic gain control unit. In another embodiment, the control signal generated by the first automatic gain control unit is used to control a gain step of the second automatic gain control unit. In addition, the invention provides a tuner with an automatic gain control unit as mentioned, and a device, e.g. a TV or a hard disc recorder with such tuner.

Automatic gain control circuit

In accordance with one or more example embodiments, wireless communications are facilitated based on user-motion. A portable motion-sensing circuit, carried by a user, indicates that motion is sensed in response to detecting whether the user has been moving for a predetermined period of time. A communication circuit operates in active mode and inactive modes respectively consuming higher and lower power, permits or inhibits access authentication communications in the active and inactive modes, and operates in the active mode in response to the motion being sensed at the motion-sensing circuit.

Wireless communications circuit

A multi-tuner apparatus comprises a splitter (S) for received RF signals. The splitter has a splitter output (U) for connection to a plurality of tuners. To reduce signal degradation and dissipation the output impedance of the splitter output is substantially lower than the input impedance of each of the tuners.

Multi-tuner apparatus for receiving RF signals

The invention concerns in general measurement of the transfer function of linear time invariant systems, more particular the calibration of such systems based on a measured transfer function. According to a first aspect the present invention an arrangement for measuring the transfer function of a linear time-invariant system is disclosed. According to a second aspect of the present invention the arrangement is implemented into a linear time-invariant circuitry having a transfer function representing the amplitude and phase characteristic of the circuitry, where by means of the arrangement for measuring the transfer function the transfer function can be optimized in accordance with certain criteria on-the-fly, i.e. in or before operation of the circuit. Finally, an effective and simple method for measuring of the transfer function of a linear time-invariant system together with the use or application of the method is shown.

Calibration of linear time-invariant system's step response

An electronic device comprising a passive harmonic-rejection mixer () and a calibration circuitry (). The passive harmonic rejection mixer has an input () connected to several sub-mixer stages (), and the sub-mixer stages are connected to a summing module () for generating the output (). Each sub-mixing stage comprises a gating module (), an amplifier (), and a weighting module (), the gating module selectively passing the input signal or the input signal with inverted polarity under the control of control signals. The calibration circuitry () is adapted to input a reference signal () to the input of the mixer, receive an output signal () from the output of the mixer, and set the weights (K, K, K, K) of the weighting modules to make the output signal match an expected output signal.

Calibration of passive harmonic-rejection mixer

The invention relates to a digital signal generator for providing one or more phases of a local oscillator signal for use in digital to analogue converters and harmonic rejection mixers. Embodiments disclosed include a local oscillator signal generator () for a mixer of a radiofrequency receiver, the signal generator () comprising a bit sequence generator () having a plurality of parallel output lines (), a digital signal generator () having a serial output line () and a plurality of input lines connected to respective output lines () of the bit sequence generator () and a clock signal input line (), wherein the digital signal generator () is configured to provide an output bit sequence on the serial output line () at a rate given by a clock signal provided on the clock signal input line () and a sequence given by a sequence of bits from the bit sequence generator () on the plurality of input lines ().

Digital signal generator

The present application relates to at least one digitally controlled oscillator and a data modulation device. More particularly, the digital polar transmitter comprises at least one digitally controlled oscillator configured to generate at least one frequency. The digital polar transmitter comprises a data modulation device, wherein the data modulation device comprises at least one data input terminal, at least one output terminal, and at least one frequency input terminal, wherein the output terminal is connected to the digitally controlled oscillator. The digital polar transmitter comprises a phase measuring device configured to measure phase information from the output signal of the data modulation device for every frequency sample. The digital polar transmitter comprises a phase error detecting device configured to detect a phase error at least depending on the measured phase information, wherein the phase error detecting device is configured to apply the detected phase error to the output signal of the data modulation device.

Polar transmitter

Calibration data for calibrating time to digital conversion is obtained by switching a feed circuit of a time to digital converter between a normal operating mode or a calibration mode. A delay circuit with a delay circuit input and a plurality of taps outputs. A sampling register samples data from the data inputs. The feed circuit provides for selection of transitions of the oscillator signal that control timing of a first active transition at the clock circuit after a transition at the delay circuit input. A control circuit switches the feed circuit between normal operating mode and calibration mode, and controls the feed circuit successively to select a plurality of different transitions to control timing of the first active transition in the calibration mode. The control circuit reads out resulting data from the sampling register for each selection and determines calibration data for the oscillator signal from said data.

Circuit with a time to digital converter and phase measuring method

A harmonic rejection mixer unit is provided which comprises an input (RF), at least one harmonic rejection unit (HRU) with at least two transistor units (T, T; T, T) for multiplying an input signal from the input (RF) with a multiplication signal (ELO). The harmonic rejection mixer unit furthermore comprises a transistor control signal generating unit (GGU) for generating transistor control signals (GS-GS) for the at least two transistor units (T, T; T, T) of the at least one harmonic rejection unit (HRU) by deriving the transistor control signals (GS-GS) from a local oscillator signal (LO). The transistor control signals (GS, GS) for the at least two transistor units (T, T; T, T) are generated with a duty cycle of &#x3c;50% and are generated such that the shape of the multiplication signal ELO) is achieved by a constructive summation of the output signals from the transistor units (T, T; T, T). The transistor control signals (GS-GS) are generated such that only a summation of output signals from the transistor units with the same sign or with zero is performed.

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Liempde, Netherlands

Jan Van Sinderen