Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LMV221 RF power detector for mobile phone tests
Edited by the Electronicstalk Editorial Team on 20 February 2007
Power detector for testing 3G handsets
National's LMV221 RF power detector enables precise power control that is stable over a large temperature range and accurate over a wide dynamic range.
National Semiconductor has introduced a radio-frequency (RF) power detector to offer guaranteed accuracy over temperature, and RF production testing, for third-generation (3G) mobile phone power controls National's LMV221 RF power detector enables precise power control that is stable over a large temperature range and accurate over a wide dynamic range
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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It provides multi-band frequency ranges from 50MHz to 3.5GHz with 40dB of dynamic range, as well as stable performance over the full temperature range of -40 to 85C with plus or minus 0.5dB accuracy.
Its real-time transmitter power adjustments simplify system calibration and reduce accuracy requirements for power amplifiers and variable gain amplifiers.
The LMV221 is designed for current and emerging cellular standards, including GSM, CDMA, UMTS and TD-SCDMA.
Operating with a single supply from 2.7 to 3.3V, the LMV221 provides an output voltage that is proportional to the RF input power in dBm.
This decreases the designer's need for extra calibration as well as reducing the resolution needed in the system's analogue-to-digital convertor.
The output voltage ranges from 0.3 to 2V and can be scaled down to meet analogue-to-digital convertor input range requirements.
The LMV221 has an RF power detection range from -45 to -5 dBm and is well-suited for direct use with a 30dB directional coupler.
This device remains in a low-power-consumption shutdown mode until powered up through the enable pin to drive the lowest power consumption possible.
The LMV225, LMV226 and LMV228 are RF power detectors with multi-band frequency ranges from 450MHz to 2GHz.
National's LMV232 is an RF detector with two RF inputs optimised to work with 20dB directional couplers.
The LMV22x family of RF power detectors provides RF power data to National's family of LM320x DC/DC convertors, including the LM3208.
The LM3208 dynamically controls the supply voltage of WCDMA and CDMA RF power amplifiers to improve the overall system efficiency.
This combination of DC/DC convertor plus power detector generates the real-time optimum power supply voltage (Vout) for a given RF transmit power, yielding significant efficiency improvements throughout the entire transmit range, especially at low transmit power levels.
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