Telefonaktiebolaget Lm Ericsson (publ)

Jacob Mannerstrangle

Torsten John Carlsson

Peter Jakobsson

Kjell Berthold Gustafsson

Martin Isberg

Bjorn Martin Lindquist

Hans Hagberg

Jan Celander

Lars Peter Kunkel

Lars-Peter Kunkel

The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.

Multi-frequency band receiver for RF signal

A phase shifting electric circuit (1) comprises units for conveying an input signal (V1) from a main signal input (12) to a main signal output (11). The circuit (1) has a first signal path (18), from the input (12) to the output (11), along which a connectable and disconnectable first active unit (3) is arranged and also a second signal path (19) along which a connectable and disconnectable second active unit (4) and a 180 degrees phase shifting unit (2) are arranged. By a method a selection is made which of the active units (3,4) is to be in a connected condition after which control signals (U1,U2) to the units (3,4) sets them in a connected and disconnected condition respectively with the outcome of a transmission from the output (11), depending on the selection, either a non-phase shifted signal (V1') or a 180 degrees phase shifted signal (V2'). Depending on the function of the active units (3,4) the signal (V1',V2') can also be affected in other respects than its relative phase.

Arrangement and method for phase shifting signals in a telesystem

A multiple-mode receiver incorporating direct conversion (processing received signals using intermediate frequencies within the same frequency range as the received signal bandwidth) rather than superheterodyne circuitry, allowing receiver hardware components to be re-used rather than replicated for each band. Various embodiments are disclosed in which low pass filters, mixers, quadrature generators, oscillators, and amplifiers are re-used.

Multiple-mode direct conversion receiver

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Eslov, Sweden

Jacob Mannerstrangle