Multi-frequency band receiver for RF signal

US6091963A · kind A · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Jacob Mannerstråle · Malmö, SE
• Martin Isberg · Lund, SE
• Bjorn Lindquist · Bjärred, SE
• Torsten Carlsson · Lund, SE
• Hans Hagberg · Malmö, SE
• Peter Jakobsson · Lund, SE
• Lars Peter Kunkel · Landskrona, SE
• Kjell Gustafsson · Lund, SE

Key dates

• Filing date: Jan 14, 1998
• Grant date: Jul 18, 2000
• Expiry date: Jan 14, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/406
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

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, dete…