WCDMA ACPR and AltCPR measurements (40)
ACPR (adjacent channel power ratio) and AltCPR (alternate channel power ratio) are both measures of spectral regrowth. They are important performance metrics for digital communication systems that use, for example, WCDMA (wideband code division multiple access) modulation. This publication highlights key considerations for accurate measurements of these parameters. In particular, highly linear direct I/Q modulators such as the LT5528 require high performance measurement equipment and careful techniques to characterize their spectral regrowth.
Measuring phase and delay errors accurately in I/Q modulators (41)
A large image rejection can be achieved in an RF transmitter ...