Microwave Engineering Europe - December 2007 - (Page 14) 14 COVER FEATURE: DC - 86 GHz MMICs MDB277, the IF band is then amplified in the HMC405 Gain Block. For applications where IF power control is desired, the VSET output of the HMC611LP4E Logarithmic Detector/ Controller can be conditioned to drive the control input of the HMC346MS8GE Voltage Variable Attenuator, to construct a closed loop power control circuit. Figure 5: A complete E-band transceiver based on Hittite-Velocium components. Finally the HMC567LC5 I/Q Receiver is used to demodulate the QPSK signal, and uses a dedicated synthesizer which is based on the HMC532LP5E VCO, HMC433E Divide-by4, and the HMC440QS16GE Phase/Frequency Detector. It should be noted that all of the die and SMT components used in the example transceiver are RoHS compliant. The designer can fabricate most of the radio with SMT components, and reserve only a small section for bare MMIC assembly. This partitioning should enable a modularized approach where the sub-25 GHz section of the radio can be assembled and tested, before being mated with the millimeterwave section. This approach also facilitates the manufacture of a significant portion of the radio by either an in-house SMT line, or by multiple, competing CM (contract manufacturer) locations. All of the products shown on the example block diagram are available from stock to support all of the major RF sections of a typical radio including the transmit, receive, LO generation and LO distribution sections of the transceiver. Hittite is well known for its broad portfolio of die and SMT packaged components for the Microwave and Millimeterwave markets. Table 1 provides a selection of Hittite’s MMIC based Amplifiers, Control Products, Mixers, Frequency Multipliers and Dividers, Switches and VCOs. This table illustrates the breadth and depth of products which Hittite offers to the radio designer. Each of these products are available as instock, off-the-shelf products. The table lists over 90 products available for millimeterwave applications from 38 to 86 GHz, with hundreds more products available which operate at IF and RF frequencies. In total, designers can choose from more than 600 standard products offered by Hittite including data converters, modulators and demodulators, phase shifters, switches, and synthesizers. Data sheets and supporting information for all of Hittite’s products are available online at www.hittite.com. Table 1: A selection of Hittite chip and SMT transceiver components for microwave and millimeterwave applications. Microwave Engineering Europe ● December 2007 ● www.mwee.com www.hittite.com http://www.hittite.com http://www.mwee.com www.mwee.com
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