Patent ID: 8611460
Filing Date: 2013-12-17
Classification: H03F,H04L

Abstract:
1. A wireless communication unit comprising: a transmitter having a forward path comprising a power amplifier and a constant gain tracking (CGT) loop, wherein a digital attenuator of the wireless communication unit is located at a starting point for a digital domain in the transmitter and a starting point for the CGT loop; and a feedback path operably coupled to the power amplifier, wherein the feedback path comprises a coupler arranged to feed back a portion of a signal to be transmitted and a controller logic module arranged to control a power control value of the power amplifier, such that the forward path and feedback path form a closed loop power control, the controller logic module being operably coupled to both an analogue signal variable gain attenuator (SVGA) and the digital attenuator, wherein the controller logic module is arranged to determine a gain variation in the transmitter and provide attenuation to a transmit signal passing therethrough on a transmit slot by transmit slot basis by setting an attenuator level of both the SVGA and the digital attenuator in response thereto.