Nxp B.v.

St-ericsson Sa

Sebastien Amiot

Sebastien Robert

Volker Aue

Jan Van Sinderen

Yann Le Guillou

Olivier Jamin

Frederic Pirot

Leonardus H M Hesen

Thibault Philippe Paul Kervaon

Fabien Laurent Michel Deforeit

A single tone RF signal generator and a method of generating a single tone RF signal. The single tone RF signal generator includes an output and a power amplifier that has an input. The power amplifier is operable to receive an RF signal including a first harmonic corresponding to a single tone signal to be produced by the signal generator. The power amplifier is also operable to amplify the RF signal. The power amplifier is further operable to provide the amplified RF signal to the output of the signal generator. The single tone RF signal generator further includes a feedback circuit connected between the output of the signal generator and the input of the power amplifier. The feedback circuit is configured to add one or more predistortion harmonics to the RF signal received by the power amplifier for cancelling harmonics in the amplified RF signal provided by the power amplifier.

Single tone RF signal generator

An adaptive stepped gain amplifier, for example for use in broadband receivers, has a step size which is dynamically compensated (for each received frequency) to cope with step error caused by frequency dependence of the amplifier performance.

Adaptive stepped gain amplifier system and method

A system and method provide adaptive filtering of radio frequency (RF) signals. Multiple signals are received in a predetermined RF spectrum, the signals including a desired signal and multiple potentially interfering signals. A first signal of the potentially interfering signals is down-converted to a baseband signal, and a power of the baseband signal is determined. When the power exceeds a predetermined threshold power, a first notch filter, corresponding to a frequency of the first signal, is activated.

System and method for adaptive radio frequency filtering

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.

Harmonic rejection mixer unit and method for performing a harmonic rejection mixing

A method and circuit for signal processing in a receiver that can be tuned to different carriers, the method determining the energy of the adjacent carriers N+1 and N&#x2212;1, wherein a carrier N contains a signal of interest and the receiver is tuned to it, from the digital signal, in that the energy value of the carriers N+1 and N&#x2212;1 determined are compared with a threshold value, and in the case where the threshold value is exceeded, a frequency shift of the signal by +&#x394;f or &#x2212;&#x394;f is effected in the second method step prior to the filtering, and the frequency shift thus produced is reversed by a frequency shift by &#x2212;&#x394;f or +&#x394;f prior to the filtering, and the signal is decoded.

Method and arrangement for signal processing in a receiver that can be tuned to different carriers

A controllable-gain circuit (TI, Rt, TS, . . . , TS) provides a first and a second pair of complementary gain-controlled signals (Ip, Ip; Ip, Ip) in response to an input signal (RFI). In each pair, one gain-controlled signal (Ip, Ip) is the input signal amplified with a gain G comprised in a range between a minimum gain Gmin and a maximum gain Gmax. The other gain-controlled signal (Ip, Ip) is the input signal amplified with complementary gain Gmax-G. A fixed-gain output circuit (Rfg, Nfg) makes a weighed sum (Ip*Rfg+Ip*Rfg) of one and the other gain-controlled signal in the first pair of complementary gain-controlled signals. The respective weighing factors for one and the other gain-controlled signal are substantially similar (Rfg). A controllable-gain output circuit (Rlg, Rhg, Nlg, Nhg) makes a weighed sum (Ip*Rlg+Ip*(Rlg+Rhg)) of one and the other gaincontrolled signal in the second pair of complementary gain-controlled signals. The respective weighing factors for one and the other gain-controlled signal are substantially different (Rlg, Rlg+Rhg).

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Bieville-Beuville, France

Sebastien Amiot