(19)
(11) EP 1 524 777 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
03.08.2005 Bulletin 2005/31

(43) Date of publication:
20.04.2005 Bulletin 2005/16

(21) Application number: 04078191.6

(22) Date of filing: 20.02.1998
(51) International Patent Classification (IPC)7: H04B 1/40
(84) Designated Contracting States:
BE DE DK ES FI FR GB GR IT SE

(30) Priority: 20.02.1997 US 803392

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98905924.1 / 0962061

(71) Applicant: Telefonaktiebolaget LM Ericsson (publ)
164 83 Stockholm (SE)

(72) Inventors:
  • Gärdenfors, Karl Hakan Torbjörn
    211 50 Malmö (SE)
  • Mattisson, Sven Erik
    237 32 Bjärred (SE)
  • Haartsen, Jacobus Cornelis
    7623 DK Borne (NL)

(74) Representative: Asketorp, Göran et al
Ström & Gulliksson AB P.O. Box 793
220 07 Lund
220 07 Lund (SE)

 
Remarks:
This application was filed on 22- 11- 2004 as a divisional application to the application mentioned under INID code 62.
 


(54) Radio transceiver on a chip


(57) A radio for receiving and transmitting high frequency signals. The radio comprises a down-conversion section (206, 208) arranged to down-convert a received first high frequency signal to an intermediate frequency signal; an up-conversion section arranged to up-convert an information signal, to be transmitted, to a second high frequency signal; a filter (220) for filtering the intermediate frequency signal; a detector (224) for information recovery; a variable voltage controlled oscillator (218) connected to the up-conversion section and the down-conversion section for down-converting said first high frequency signal during a receive cycle and up-converting said information signal during a transmit cycle in a time division duplex mode. The up-conversion section, the down-conversion section, and the variable controlled oscillator are integrated on a single IC chip. Also, the variable controlled oscillator is modulated by the information signal during the transmit cycle.