Nxp B.v.

Epcos Ag

Antonius J M De Graauw

Kevin Robert Boyle

Johannes Frederik Dijkhuis

Peter G Steeneken

Robert Frederick Milsom

Jozef T M Van Beek

Theodoor G S M Rijks

Johannes M C Verspeek

Adrianus A J Buijsman

A tuneable capacitor arrangement for RF use has two series coupled MEMS variable capacitors (C,C;C,C,C,C), varied according to a control signal. The series coupling enables the capacitor to withstand a higher voltage since this is shared by the individual capacitors in a series coupled arrangement. An increase in size of electrodes for each capacitor is compensated by a reduction in size of the springs supporting movable electrodes. These springs can have a larger stiffness value since the capacitance is larger. This means shorter springs, which can also result in a reduction in problems of stiction, resistance, and slow switching. The capacitances have a fixed and a movable electrode, with the RF signal coupled to the fixed electrode to avoid the springs needing to carry an RF signal. This can reduce the problems of inductance and resistance in the springs.

Arrangement of MEMS devices having series coupled capacitors

An integrated circuit suitable for use at high frequencies and comprising a first capacitor having an input and an output, as well as a ground connection, wherein the capacitor is ESD-protected through an resistor between the capacitor output and the ground connection, which resistor has a resistance value that is sufficiently high so as to prevent any substantial influence on RF performance of the ground connection.

Integrated circuit and assembly therewith

The present invention relates to an electronic device for power efficient linear amplification. The electronic device includes an amplifier (RF-PA) for amplifying a phase modulated signal (PM). The amplifier (RF-PA) is adapted to be controlled by a first modulating signal (AM high) for modulating the amplitude of the phase modulated signal (PM) above a predetermined amplitude value. The electronic device is further adapted to attenuate an output signal of the amplifier (RF-PA) for providing amplitude modulation below the predetermined amplitude value.

Amplifier architecture for polar modulation

A multi-mode radio module () comprises a terminal () for connection to an antenna (). A transmitting branch (DCS/PCS) and a branching circuit are coupled to the terminal (). The branching circuit comprises at least a first and a second branch for receiving signals in first and second frequency bands (DCS, PCS), respectively. Each of the first and second branches comprise, respectively, a phase shifting circuit (PS, PS), a BAW or SAW band pass filter (RXF, RXF) coupled to the phase shifting circuit, the bandwidth of the filter being selected to pass a wanted signal in one of the first and second frequency bands but reject an unwanted signal in the other of the second and first frequency bands, and a low noise amplifier (LNA, LNA) coupled to an output of the band pass filter. The response of each of the band pass filters (RXF, RXF) is phase shifted to present an open circuit at the wanted frequency in the other branch. Each of the phase shifting circuits (PS, PS) is impedance transforming so that higher impedance filters can be used.

Growing community of inventors

Haelen, Netherlands

Antonius J M De Graauw