Multi-band receiver

• US 20050143031A1
• Filed: 01/21/2002
• Published: 06/30/2005
• Est. Priority Date: 02/06/2002
• Status: Abandoned Application

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Moonen, Oswald, Crijns, Stephanus Josephus Maria, Rutten, Peter Johannus Henricus
• Application Number:
  US10/503,789
• Publication Number:
  US 20050143031A1
• Time in Patent Office: Days
• US Class Current: 455/168.100
• CPC Class Codes: H03J 3/08 by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A multi-band receiver for receiving an input signal having a frequency situated either in a first band or in a second band. The receiver comprising a mixer for combining an amplified signal having substantially the same frequency as the input signal with a periodical signal generated by a local oscillator. The mixer generates an intermediate frequency signal, the intermediate frequency signal (IF) being inputted to an IF band-pass filter. A central frequency of the band-pass filter is substantially equal to a frequency of the intermediate frequency signal. The receiver is characterized in that the central frequency of the IF band-pass filter is substantially independent of a combining mode of the amplified signal and the periodical signal, the combining mode being selected from an upper heterodyning mode and a lower heterodyning mode.

Claims

1. A multi-band receiver for receiving an input signal (RFin) having a frequency situated either in a first band or in a second band, said receiver comprising a mixer for combining an amplified signal (RF) having substantially the same frequency as the input signal (RFin) with a periodical signal generated by a local oscillator, said mixer generating an intermediate frequency signal (IF), the intermediate frequency signal (IF) being inputted to an IF band-pass filter having a central frequency substantially equal to a frequency of the intermediate frequency signal (IF), the receiver being characterized in that the central frequency of the IF band-pass filter is substantially independent of a combining mode of the amplified signal (RF) and the periodical signal, the combining mode being selected from an upper heterodyning mode and a lower heterodyning mode.

2. A receiver as claimed in claim 1 wherein the periodical signal generated by the local oscillator is situated in a third band that is substantially independent of the combining mode.

3. A receiver as claimed in claim 1 wherein the third band is between the first band and the second band.

4. A receiver as claimed in claim 1 wherein the IF band-pass filter comprises a plurality of image-rejection filters for attenuating image frequency signals resulting from the mixer, the IF band-pass filter being controlled by a control signal.

5. A receiver (1) as claimed in claim 1 wherein the local oscillator is a quadrature oscillator.

6. A transceiver comprising a receiver as claimed in claim 1, said transceiver further comprising switching means coupled to an input (I) of the receiver and to an output (O) of a transmitter, said switching means controlling a communication mode of the transceiver, the communication mode being selected from a receiving mode and a transmitting mode.