AD8313是一款RF对数检波器与控制器，频率响应范围为0.1至2.5 GHz。它能将差分输入处的调制RF信号地转换为直流输出处的等效dB标度值，动态范围达70 dB(±3 dB精度)或62 dB(±1 dB精度)。AD8313适用于RF发射器和接收器功率测量与控制应用，它采用8引脚小型SO封装，应用中仅要求提供2.7 V至5.5 V电源以及输入耦合和电源去耦电容。

FEATURES
Wide Bandwidth: 0.1 GHz to 2.5 GHz Min
High Dynamic Range: 70 dB to 63.0 dB
High Accuracy: 61.0 dB over 65 dB Range (@ 1.9 GHz)
Fast Response: 40 ns Full-Scale Typical
Controller Mode with Error Output
Scaling Stable Over Supply and Temperature
Wide Supply Range: +2.7 V to +5.5 V
Low Power: 40 mW at 3 V
Power-Down Feature: 60 mW at 3 V
Complete and Easy to Use
APPLICATIONS
RF Transmitter Power Amplifier Setpoint
Control and Level Monitoring
Logarithmic Amplifier for RSSI Measurement
Cellular Base Stations, Radio Link, Radar
PRODUCT DESCRIPTION
The AD8313 is a complete multistage demodulating logarithmic
amplifier, capable of accurately converting an RF signal at
its differential input to an equivalent decibel-scaled value at its
dc output. The AD8313 maintains a high degree of log conformance
for signal frequencies from 0.1 GHz to 2.5 GHz and
is useful over the range of 10 MHz to 3.5 GHz. The nominal
input dynamic range is –65 dBm to 0 dBm (re: 50 W), and the
sensitivity can be increased by 6 dB or more with a narrow band
input impedance matching network or balun. Application is
straightforward, requiring only a single supply of 2.7 V–5.5 V
and the addition of a suitable input and supply decoupling.
Operating on a 3 V supply, its 13.7 mA consumption (for TA =
+25°C) amounts to only 41 mW. A power-down feature is
provided; the input is taken high to initiate a low current
(20 mA) sleep mode, with a threshold at half the supply voltage.
The AD8313 uses a cascade of eight amplifier/limiter cells,
each having a nominal gain of 8 dB and a –3 dB bandwidth of
3.5 GHz, for a total midband gain of 64 dB. At each amplifier
output, a detector (rectifier) cell is used to convert the RF signal
to baseband form; a ninth detector cell is placed directly at the
input of the AD8313. The current-mode outputs of these cells
are summed to generate a piecewise linear approximation to the
logarithmic function, and converted to a low impedance voltagemode
output by a transresistance stage, which also acts as a lowpass
filter.

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