500 MHz, 45 dB Linear-in-dB Variable Gain Amplifier
Silicon Bipolar VGA with integrated Square Law Detector
The AD8367 is a high-performance variable gain amplifier designed to be used at IF frequencies up to 500 MHz. An externally applied analog gain control voltage of 0 to 1 volt, scales the 45 dB of gain control range to provide 20 mV/dB output. The precise linear-dB gain control is achieved with a proprietary X-AMP™ architecture, consisting of a variable attenuator network fed by a Gaussian interpolator yielding precise linear gain adjustment.
In addition the AD8367 has an integrated square law detector, which enables the part to be used as an AGC solution and provides a detected received signal strength indication (RSSI) output voltage.
The AD8367 has been specified for operation at common IF frequencies 70 MHz, 140 MHz, 190 MHz and 240 MHz found in the cellular CDMA / GSM and W-CDMA applications.
The AD8367 is fabricated on a high performance silicon bipolar process, package in 14-lead thin shrunk small outline (TSSOP) package fully specified over –40°C to +85°C temperature range.
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
AD8367-EVALZ is a fully populated, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all features of the AD8367. Signal input and output SMA connections with a single ended setup is featured. AGC mode is easily setup with pulling the MODE pin low (SW2) and shorting the DETO pin to the GAIN pin (SW1). Access to the +5 V/26 mA supply is achieved with clip leads to the VPOS and GND testpoints; it has a range from +2.7 to +5.5 V.
Product Selection Guide
Variable Gain Amplifier Selection Table
X-amp, A New 45-dB, 500-MHz Variable-Gain Amplifier (VGA) Simplifies...
(Analog Dialogue, Vol. 36, No. 1, January-February, 2002)
RF Source Booklet
RF IC Product Overview
Linear-in-dB Variable Gain Amplifier Provides True RMS Power Measurements
by Eric Newman and Stephen Lee, Analog Devices, Inc. (Wireless Design 2004)
Integrated VGA Aids Precise Gain Control
by Phillip Halford and Eamon Nash, Analog Devices, Inc. (Microwaves & RF, March 2002)