| US 7,548,590 B2 | ||
| Method for determining an offset value for a gain of a transmission path, transmission path with adjustable gain, and use of the transmission path | ||
| Rainer Koller, Linz (Austria); and Manfred Haberl, Linz (Austria) | ||
| Assigned to Infineon Technologies AG, Munich (Germany) | ||
| Filed on Oct. 19, 2005, as Appl. No. 11/253,361. | ||
| Claims priority of application No. 10 2004 051 595 (DE), filed on Oct. 22, 2004. | ||
| Prior Publication US 2006/0098271 A1, May 11, 2006 | ||
| Int. Cl. H04L 27/00 (2006.01); H04L 27/08 (2006.01) | ||
| U.S. Cl. 375—295 [375/345; 330/254; 330/278; 455/127.2; 455/127.3] | 16 Claims |
| 1. A method for determining an offset value for a gain of a transmission path, comprising:
providing a transmission path comprising a first discrete-value adjustable amplifier with a first amplifier gain step size
and having a second discrete-value adjustable amplifier with a second amplifier gain step size;
setting a first total gain factor for the transmission path by programming the first amplifier with a first gain factor and
the second amplifier with a second gain factor, respectively;
supplying a first test signal to the transmission path and ascertaining a level of a first output signal from the transmission
path;
altering the second gain factor by at least a second amplifier gain step size, and altering the first gain factor so that
the total gain factor remains substantially the same as the first total gain factor;
supplying a second test signal to the transmission path and ascertaining a level of a second output signal from the transmission
path; and
determining an offset value for the second amplifier gain by comparing the ascertained levels of the first and second output
signals.
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