Wireless Tranceiver Configuration with Self-Calibration for Improved Out of Band Interferer Rejection

• US 20080233893A1
• Filed: 07/28/2006
• Published: 09/25/2008
• Est. Priority Date: 07/29/2005
• Status: Abandoned Application

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Duperray, David
• Application Number:
  US11/997,197
• Publication Number:
  US 20080233893A1
• Time in Patent Office: Days
• US Class Current: 455/77
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements

Abstract

The present wireless transceiver includes a tuneable narrow band LNA which rejects dramatically any out of band interferers. The tuneable narrow band LNA may be operable over a wide frequency band. A loopback calibration procedure is used to control the tuneable narrow band LNA so as to produce a substantially flat gain characteristic over the band of interest.

Claims

1. A method of receiving a communications signal within a wide frequency band using a transceiver including a transmitter and a receiver, the receiver including a frequency-tuneable narrowband amplifier, comprising:

establishing a loopback path from the transmitter to the receiver;

using the loopback path, calibrating the amplifier within at least two different sub-bands within the wide frequency band to obtain amplifier settings for each of the two different sub-bands;

at a first time, applying first amplifier settings to the amplifier to receive a communications signal within the first sub-band; and

at a second time, applying second amplifier settings to the amplifier to receive a communications signal within the second sub-band.

2. The method of claim 1, wherein calibration compensates for at least one of process variations and temperature variations.

3. The method of claim 1, wherein the amplifier has a frequency response that rejects significantly any interferers out of a desired reception band.

4. A wireless transceiver for receiving a communications signal within a wide frequency band, comprising:

a transmitter and a receiver, the receiver including a frequency-tuneable narrowband amplifier;

means for establishing a loopback path from the transmitter to the receiver;

means for, using the loopback path, calibrating the amplifier within at least two different sub-bands within the wide frequency band to obtain amplifier settings for each of the two different sub-bands;

means for, at a first time, applying first amplifier settings to the amplifier to receive a communications signal within the first sub-band, and at a second time, applying second amplifier settings to the amplifier to receive a communications signal within the second sub-band.

5. The apparatus of claim 4, wherein calibration compensates for at least one of process variations and temperature variations.

6. The apparatus of claim 4, wherein the amplifier has a frequency response that rejects significantly any interferers out of a desired reception band.

8. The apparatus of claim 4, wherein calibration compensates for at least one of process variations and temperature variations.

9. The apparatus of claim 4, wherein the amplifier has a frequency response that rejects significantly any interferers out of a desired reception band.

7. A wireless transceiver for receiving a communications signal within a wide frequency band, comprising:

a transmitter and a receiver, the receiver including a frequency-tuneable narrowband amplifier;

coupling circuitry for establishing a loopback path from the transmitter to the receiver;

calibration circuitry for, using the loopback path, calibrating the amplifier within at least two different sub-bands within the wide frequency band to obtain amplifier settings for each of the two different sub-bands;

control circuitry for, at a first time, applying first amplifier settings to the amplifier to receive a communications signal within the first sub-band, and at a second time, applying second amplifier settings to the amplifier to receive a communications signal within the second sub-band.