Abstract: A receiver circuit comprising a connection portion for guiding each one of a first predefined number of carrier signals of multiple carriers to one of a number of receive branches, each receive branch comprising at least one amplifier load structure, the number of receive branches being equal to the first predefined number. The receiver circuit also comprises a mixing portion for generating a second predefined number of mixed carrier signals on each receive branch by mixing a carrier signal on each one of the receive branches with a number of local oscillator frequencies equal to the second predefined number, and a selection portion for selecting one of the second predefined number of mixed carrier signals on each receive branch to be output via a number of output paths equal to the first predetermined number to a digital data path.

Abstract: A receiver circuit comprising a connection portion for guiding each one of a first predefined number of carrier signals of multiple carriers to one of a number of receive branches, each receive branch comprising at least one amplifier load structure, the number of receive branches being equal to the first predefined number. The receiver circuit also comprises a mixing portion for generating a second predefined number of mixed carrier signals on each receive branch by mixing a carrier signal on each one of the receive branches with a number of local oscillator frequencies equal to the second predefined number, and a selection portion for selecting one of the second predefined number of mixed carrier signals on each receive branch to be output via a number of output paths equal to the first predetermined number to a digital data path.

Abstract: Measures are provided for performing direct radio-frequency to digital conversion. A radio-frequency input signal is compared with a plurality of reference voltages to generate a plurality of comparison signals, each comparison signal corresponding to one of the plurality of reference voltages. One or more of the plurality of generated comparison signals are first filtered to generate a first filtered signal. One or more of the plurality of generated comparison signals are second filtered to generate a second filtered signal. A digital output signal is generated at least on the basis of the first filtered signal and the second filtered signal.

Abstract: Measures are provided for performing direct radio-frequency to digital conversion. A radio-frequency input signal is compared with a plurality of reference voltages to generate a plurality of comparison signals, each comparison signal corresponding to one of the plurality of reference voltages. One or more of the plurality of generated comparison signals are first filtered to generate a first filtered signal. One or more of the plurality of generated comparison signals are second filtered to generate a second filtered signal. A digital output signal is generated at least on the basis of the first filtered signal and the second filtered signal.

Abstract: A polar transmitter, operable in linear mode or switched mode, uses a conversion module to convert baseband signals into amplitude data and phase data. The phase data is used to phase modulate a carrier frequency in a radio frequency conversion module. The module comprises a plurality of parallel unit cells, each being a mixer cell type converter having a differential data switch section connected in series to a differential local oscillator-switch pair. The differential local oscillator-switch is connected in series to a current source. Each unit cell is adapted to receive a signal through an input end. In switched mode, the phase-modulated carrier frequency is amplitude modulated by the amplitude data through the supply voltage to a power amplifier. In linear mode, amplitude data is conveyed to the input end of the unit cells for modulating the phase-modulated carrier frequency in the conversion module.

Abstract: A radio frequency (RF) transmitter uses two digital-to-RF conversion modules to convert digital baseband signals into RF signals. In cartesian mode, baseband signals are conveyed to the conversion modules for RF conversion. In polar mode, baseband signals are converted into amplitude and phase data parts. Phase data part is converted into I (inphase) and Q (quadrature) data parts to be converted into RF signals which are modulated in a power amplifier by amplitude data part through the power supply of the power amplifier. Each digital-to-RF module uses parallel unit cells to perform digital-to-analog (D/A) conversion and upconversion functions by an IF signal. Each unit cell, adapted to receive a control voltage indicative of a data signal value, is a mixer cell type converter having a differential data switch section connected in series to a differential LO (local oscillator)-switch pair. LO-switch is further connected in series to a current source.

Abstract: The invention relates to a device for digital-to-radio frequency conversion, the device comprising: conversion cell matrices for digital-to-radio frequency conversion; means for providing a digital data signal; means for dividing the digital data signal into data signal groups; means for generating clock signals, the clock signals having different phases, the number of clock signals being the same as the number of data signal groups; means for synchronizing the data signal groups by using the clock signals; means for conveying the synchronized data signal groups to the conversion cell matrices, the number of conversion cell matrices being the same as the number of data signal groups; and means for synchronizing each conversion cell matrix by using the clock signal with which the synchronized data signal group conveyed thereto was synchronized for generating interpolation values.

Abstract: An RF transmitter having two digital to RF-conversion devices that combine the D/A conversion function and the upconversion function by a RF-carrier or IF-signal. The device comprises a plurality of parallel unit cells, each of which is a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. The differential LO-switch is further connected in series to a current source. Each unit cell is adapted to receive a control voltage indicative of a data signal value.