| 摘要 |
<p>The present invention proposes a mobile terminal for a wireless telecommunication system comprising a high-frequency transmit power amplifier (12) operated across a d.c. supply voltage (Vs) and a closed loop power control circuit (10) for controlling an output power (Pout) of said power amplifier (12). The power control circuit (10) compares a reference signal (Vref) indicative of a target value of said output power (Pout) to a signal (Vsense) indicative of an actual value of said output power (Pout) and provides a manipulated signal (VAPC) to said power amplifier (12) for manipulating the same. The power control circuit (10) includes current detection means (18) for detecting, as said signal (Vsense) indicative of said actual value of said output power (Pout), a signal indicative of a supply current (IS) drawn by said power amplifier (12). Voltage detection means (26) are provided for detecting a signal indicative of an actual value of said supply voltage (VS or Vbat). The power control circuit (10) is responsive to said voltage detection means (26) and arranged to vary said manipulated signal (VAPC) dependent on said actual value of said supply voltage (VS or Vbat) as detected by said voltage detection means (26). In this way, the amplifier's output power can be precisely controlled even when the supply voltage (VS or Vbat) varies. <IMAGE></p> |
