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Telecoms ♦ news digest


The amplifiers bring a host of new functionality to the existing Avago VMMK-1xxx and VMMK-2xxx families, including a positive gain slope low-noise amplifier (LNA), a wideband LNA, a variable gain amplifier (VGA), and four directional detectors.


With miniature 0402 package dimensions and no wirebonds, the VMMK-3xxx amplifiers experience almost no signal loss and minimal parasitics. The devices take up 5 % of the volume and use only 10 % of the board area of solutions using a standard SOT-343 package. In some cases, the miniature amplifiers can effectively reduce PCB area by more than 50 %.


The compact size and fully-matched surface mount design are optimised for 500 MHz to 12 GHz frequencies, making the devices ideal for a variety of radio architectures and space-constrained applications. Requiring no special tooling for assembly, the LNAs have all I/Os routed to the backside of the device wafer through via-holes, resulting in RF transitions suffering almost no signal loss and minimal parasitics.


The VMMK-3xxx LNAs and VGA can be used in UWB, WLAN, WiMAX, generic IF amp and gain block applications, while the new detectors can be used in base stations, point-to-point radios and generic power control loop detectors, as well as for monitoring power amplifier output.


Avago says this is a significant improvement over conventional plastic packages where bond-wires exhibit substantial parasitics that limit the operating frequency. The miniature amplifier family provides high gain, a high third-order intercept point (IP3) for good linearity, low noise figure (NF) and integrated 50-ohm input and output matching networks to simplify system design.


The VMMK-3xxx family includes:


* VMMK-3503: 0.5-18 GHz VGA – This broadband, wide-dynamic-range VGA features 12 dB maximum gain, 1.5 dB NF, 8 dBm IIP3 and 23 dB gain control range, and it consumes 300 mW.


* VMMK-3603: 1-6 GHz Positive Gain Slope LNA


– This high-gain, self-biasing LNA features 17 dB gain, 1.5 dB NF and good linearity of 25 dBm OIP3, and it consumes 180 mW. With its positive gain slope, the LNA enables flat overall system gain.


Renesas Electronics is marketing a new insulated gate bipolar transistors (IGBT) drive optocoupler module, the PS9402.


October 2011 www.compoundsemiconductor.net 95


* VMMK-3803: 3-11 GHz LNA – This high-gain, self-biasing LNA features 20 dB flat gain, 1.5 dB NF and good linearity of 0.5 dBm IIP3, and it consumes 60 mW.


* VMMK-3113: 2-6 GHz Directional Detector – This detector features 0.25 dB insertion, greater than 45 dB dynamic range, low input and output return losses (< 20 dB) and 10 dB directivity. This detector requires 1.5V with 0.18 mA for DC biasing.


* VMMK-3213: 6-18 GHz Directional Detector – This detector features 0.4 dB insertion, greater than 40 dB dynamic range, low input and output return losses (< 20 dB) and 15 dB directivity. This detector requires 1.5V with 0.18 mA for DC biasing.


* VMMK-3313: 15-33 GHz Directional Detector – This detector features 0.5 dB insertion, greater than 37 dB dynamic range, low input and output return losses (< 20 dB) and 12 dB directivity. This detector requires 1.5 V with 0.18 mA for DC biasing.


* VMMK-3413: 25-45 GHz Directional Detector – This detector features 0.8 dB insertion, greater than 35 dB dynamic range, low input and output return losses (< 20 dB) and 10 dB directivity. This detector requires 1.5 V with 0.18 mA for DC biasing.


U.S. Pricing and Availability


The VMMK-3xxx amplifiers are priced starting at $2.00 each in 1,000 piece quantities. Samples and production quantities are available now through the Avago direct sales channel and via worldwide distribution partners.


Renesas reveals optocoupler with integrated IGBT protection


The firm’s latest module which features an AlGaAs light emitting source simplifies the development of more compact inverters for industrial equipment and solar power generation systems.


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