解決射頻功率檢測(cè)挑戰(zhàn)

　　大多數(shù)射頻設(shè)備必須監(jiān)控并控制其射頻功率輸出，以符合政府的規(guī)定，盡量減少射頻干擾，并盡量減少電力使用。發(fā)射機(jī)也這樣做有明顯的原因：1）最大限度地減少發(fā)射功率，增加運(yùn)行時(shí)間和2），以盡量減少功耗。

　　對(duì)于接收到的信號(hào)路徑，射頻功率檢測(cè)也是一個(gè)關(guān)鍵的功能。這是需要監(jiān)測(cè)接收到的射頻功率調(diào)整增益，在RSSI（接收信號(hào)強(qiáng)度指示器）是用于控制射頻/增益如果通過(guò)AGC（自動(dòng)增益控制）信號(hào)鏈電路為了保持恒定，為后續(xù)的模數(shù)轉(zhuǎn)換優(yōu)化信號(hào)電平（如果有）和解調(diào)。RSSI信號(hào)也被用來(lái)控制發(fā)送信道，從而最大限度地減少發(fā)射功率，同時(shí)還保持一個(gè)可接受的最小誤碼率（誤碼率）。由于這些原因，準(zhǔn)確的射頻功率檢測(cè)是重要的兩個(gè)接收器和發(fā)射機(jī)。

　　Note that this RF power detection differs from RF power measurement， although there is some confusion， ambiguity， and overlap in the terminology. RF power detection is generally used to refer to the measurement of the RF power （usually as a relative value） as represented by a voltage （and current） within an electronic circuit; in contrast， RF power measurement is direct measurement of the power （usually as anabsolute value） of the RF wireless signal in space or air.

　　For the former situation， various ICs and modules are used within a circuit; for the latter， specialized sensors （often based on thermocouples） intercept the impinging RF energy and then convert its heat energy to a voltage corresponding to the RF power. ［Recall that power and energy are intimately related parameters： energy is the time integral of power， while power is the time derivative of energy， the rate at which energy is being received or sourced.］