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Log RF Power Detector delivers 75dB range

Posted: 22 May 2008     Print Version  Bookmark and Share

Keywords:RF power detector  dynamic range  WiMAX 

Linear Technology Corp. has launched a new monolithic broadband, high performance logarithmic RF power detector. The LT5538 RF power detector provides accurate RF power measurement over a wide frequency range covering the 800-900MHz and the 1.7GHz to 2.2GHz cellular bands, as well as the 2.6GHz and 3.5GHz WiMAX bands. It also features a DC output voltage that is log-linearly proportional to its input power level. This RF power detector exhibits best-in-class accuracy and linearity of ±0.8 dB beyond its rated operating temperature range of -40°C to 85°C within its measurement dynamic range. Additionally, the

LT5538 has exceptional sensitivity that allows it to detect signals as small as -75dBm to as large as +10dBm at 2.14GHz. This device works with a single-ended RF input. It needs no external RF transformer, thus simplifying design while reducing costs.

The LT5538's dynamic range performance is ideal for RF power amplifier power control and monitoring for a wide range of wireless systems, as well as receiver AGC (Automatic Gain Control), and RSSI (Receive Signal Strength Indicator) functions. These are required functions for cellular basestations of all types, including large cells, microcells, picocells, and femtocells, wireless repeaters, WiMAX basestations, broadband wireless access points, broadband cable networks, military and commercial long-range radios, as well as test and measurement instrumentation. The LT5538's accuracy performance helps to minimise equipment calibration requirements, resulting in stable system performance and reduced operating costs.

The LT5538 utilises Linear Technology's high-speed bipolar process, enabling wide bandwidth and dynamic range performance. The fast output response of 100ns rise time and 200ns fall time to rapidly changing RF input signal levels make it suitable for rapid measurement of RF signal power in TDD (Time Division Duplexing) switching wireless operating environments, including WiMAX, TD-SCDMA, and other applications.

The LT5538 operates over a wide supply voltage range of 3V to 5.25V, drawing a low quiescent supply current of 29mA compared to other similar class detectors. A shutdown feature is provided. When the chip is disabled with a logic LOW applied to its ENABLE input pin, the chip draws a typical shutdown current of 1uA, and a maximum of 100uA. The device comes in a tiny 8-lead, 3mm x 3mm DFN surface mount package. Pricing starts at Rs.180.09 ($4.50) each in 1,000-piece quantities. The LT5538 is available immediately.

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