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User's Guide
SNWA006A–December 2007–Revised April 2013
AN-1766 Evaluation Board for the
LMV221 Logarithmic Power Detector
1 General Description
This evaluation board, Figure 1, is designed to aid in the characterization of the Texas Instruments
LMV221 Logarithmic Power Detector. This board simplifies the measurement of the DC output voltage that
the LMV221 produces in response to the power level of the RF signal applied to the RF input. Use the
evaluation board as a guide for high frequency layout and as a tool to aid in device testing and
characterization.
Figure 1. LMV221 Evaluation Board
2 Basic Operation
The LMV221 is a 40 dB RF Logarithmic power detector intended for use in CDMA and WCDMA
applications. The device has an RF frequency range from 50 MHz to 3.5 GHz. It provides an accurate
temperature and supply compensated output voltage that relates linearly to the RF input power in dBm.
The circuit operates with a single supply from 2.7V to 3.3V and has an RF power detection range from
−45 dBm to −5 dBm. The board consist of a single LMV221 along with external components soldered on a
printed circuit board. Figure 2 shows the schematic of the LMV221 evaluation board.
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SNWA006A–December 2007–Revised April 2013 AN-1766 Evaluation Board for the LMV221 Logarithmic Power Detector
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