| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for increasing receiver immunity to interference. <P>SOLUTION: The power level of a received signal is detected and if the power level meets or exceeds a predetermined power threshold, by providing a by-pass path 730 in a low noise amplifier 703, the intercept point of the receiver components is increased. Alternative embodiments include the use of an RF power detector to control the front-end gain as a function of jammer power. In lieu of a switchable RF gain block, several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block. The gain change in the IF signal power is measured and if the change is less than the predetermined amount, the CDMA signal and jammers are below the noise floor and, therefore, the gain is increased. If the IF signal power change is greater than the predetermined amount, the gain is reduced to reduce the intermodulation products. <P>COPYRIGHT: (C)2008,JPO&INPIT |
