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In this work the high speed data transmitters for wireless applications has been investigated. The work reviews concepts and techniques related to the effect of modulation accuracy on high speed downlink packet access (HSDPA) radio link performance. The error vector magnitude (EVM) results are simulated and discussed by using the test models without HSDPA (test model 1) and with HSDPA (test model 5) defined in 3rd generation partnership project (3gpp) for RF part by introducing some non-linearity in the test signal passing through RF transmitter (RFTX) chain. In this work from the figures 5 (PSat = 10.1 dBm), 6 (PSat = 13.2 dBm) and the discussions based on 3gpp specs (EVM = 17.5 % without HSDPA and 12.5 % with HSDPA) it can be concluded that the RF TX path got to be (PSat =3.1 dBm) more linear to support the HSDPA.