US 2016/0365933 A1 · Second Order Intercept Point (IP2) Calibration for Wireless Receivers

Abstract

IP2 calibration efficiency can be improved by passing the calibration signal through the transceiver's duplexer instead of inserting the calibration signal directly onto transceivers receive circuit. Passing the calibration signal through the duplexer may reduce IP2 calibration periods for transceivers having less-permeable duplexers, or duplexers that provide better than average separation between the RX and TX circuits. IP2 calibration inefficiencies can also be reduced by using a binary-like search when computing the in-phase and quadrature-phase path correction coefficients of the IP2 correction code.

Claims20

Dependent claims

A method for second order intercept point (IP2) calibration of a wireless transceiver, the method comprising:

receiving a calibration signal from the wireless transceiver, the calibration signal comprising second order intermodulation distortion (IMD2);
determining an in-phase correction (I-correction) of an IP2 correction code by examining multiple sets of I-correction values on a fixed quadrature-phase path (Q-path), wherein each of the multiple sets of I-correction values are associated with a different step size;
and
determining a quadrature-phase correction (Q-correction) of the IP2 correction code in accordance with the I-correction of the IP2 correction code.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/244,675Filed 23 Aug 2016

Priority

3 Jun 2013

Published

15 Dec 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 17/22
For calibration; for correcting measurements: for calibration of the receiver components
H04B 17/00
Monitoring
H04B 17/0085
Using service channels; using auxiliary channels: using test signal generators
H04B 17/14
For calibration: of the whole transmission and reception path, e.g. self-test loop-back

Second Order Intercept Point (IP2) Calibration for Wireless Receivers

Life of this patent

Second Order Intercept Point (IP2) Calibration for Wireless Receivers

Life of this patent

Abstract

Claims20