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Test and Measurement

New Ultra Wideband Log Detector Delivers High Dynamic Range Up To 10 GHz

January 17, 2011
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Hittite Microwave Corporation, the world class supplier of complete MMIC based solutions for communication & military markets, has introduced its fourth Logarithmic Detector/Controller product which is ideal for RF power measurement and control in Cellular/PCS/3G, WiMAX, WiBro, Fixed Wireless, Radio Link and Radar applications over the full 1 MHz to 10 GHz frequency range. The HMC611LP4(E) Logarithmic Detector/Controllers is fabricated in a SiGe BiCMOS process, and converts RF signals at its differential input to a proportional output DC voltage. The HMC611LP4 (E) is pin-compatible with the previously released HMC602LP4 (E) and delivers an extremely high ±1 dB dynamic range of greater than 60 dB from 50 MHz to 5.8 GHz, 54 dB dynamic range at 8 GHz with outstanding stability of 1 dB total error from -40°C to +85°C. In logarithmic detection mode the HMC611LP4(E) provides a nominal logarithmic slope of -25 mV/dB and a nominal intercept of 12 dBm up to 5.8 GHz. The RF input is externally matched to 50 Ohms and the device operates with a supply voltage of +5V, consuming 106 mA. Ideal for applications such as RF transmitter power amplifier control, RSSI measurement in cellular basestations, radio link and radar, the HMC611LP4(E) also exhibits 8 ns rise and fall times, which is ideal for RF burst detection up to a 60 MHz pulse rate. The HMC611LP4(E) may be operated in controller mode, which allows for an external voltage to be applied to the VSET pin, to create an automatic gain control feedback loop which is ideal for RF power monitoring and control circuits. The HMC611LP4(E) is housed in a 4x4 mm plastic QFN package and specified for operation over the -40°C to +85°C temperature range. Samples and evaluation PC boards for all SMT packaged products are available from stock and can be ordered via the company’s e-commerce site or via direct purchase order. Released data sheets are available on-line at

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