Programmable linear receiver and method for providing programmable linear in receiver

一种可编程线性接收机(1200)，以减少的功耗提供所需的系统性能水平。该接收机根据对来自接收机(1200)的输出信号的非线性的测量把功耗减到最少。可通过RSSI斜率或每码片能量与噪声比(Ec/Io)测量来测量非线性的量。RSSI斜率为输出信号的变化加上互调与输入信号之比。把输入信号电平周期性地增加预定的电平，并测量来自接收机(1200)的输出信号。输出信号包括所需的信号及来自接收机(1200)内的非线性的互调产物。当接收机(1200)在进行线性操作时，输出信号电平随输入信号电平一dB一dB地增加。然而，当接收机(1200)过渡到非线性区时，由非线性产生的互调产物增加得比想要的信号快。通过检测RSSI斜率，可确定由非线性引起的退化量。然后，使用该信息来调节放大器(1234)与混频器(1230)的IIP3操作点，以提供所需的性能水平，同时把功耗减到最少。 A programmable linear receiver which provides the requisite level of system performance at reduced power consumption. The receiver minimizes power consumption based on measurement of the non-linearity in the output signal from the receiver. The amount of non-linearity can be measured by the RSSI slope or energy-per-chip-to-noise-ratio (Ec/Io) measurement. The RSSI slope is the ratio of the change in the output signal plus intermodulation to the change in the input signal. The input signal level is periodically increased by a predetermined level and the output signal from the receiver is measured. The output signal comprises the desired signal and intermodulation products from non-linearity within the receiver. When the receiver is operating linearly, the output signal level increases dB per dB with the input signal level. However, as the receiver transitions into non-linear region, intermodulation products due to non-linearity increase faster than the desired signal. By detecting the RSSI slope, the amount of degradation due to non-linearity can be determined. This information is then used to adjust the IIP3 operating point of the amplifiers and mixer to provide the requisite level of performance while minimizing power consumption.