Microwave Engineering Europe - January/February 2008 - (Page 17)

COVER FEATURE — RF SIP DESIGN 17 measured non-linear power/bias dependent S-parameters from actual parts. Figure 4 shows the system architecture with three MMICs (20-40 GHz ampliﬁer; 40 GHz double-balanced mixer; and 10-26.5 GHz frequency doubler as shown in Figures 5a, b, and c) represented by circuit models and two MMICs (6-20 GHz medium power ampliﬁer and 21.2-26.5 GHz LNA) modeled with measured data. The measured power- and biasdependent non-linear (but in this example, only linear bias dependent model are used) data are used in the Advanced Design System through Data Access Component (DAC) which allows arbitrary multidimensional data to be interpolated during simulation sweeps. Additionally, embedded passive components are simulated with integrated 3D-EM, which generates a layout lookalike schematic component to associate correct pins to S-parameter data ports automatically. This eliminates manual connectivity errors. The new 3D viewer from ADS 2008 makes visualizing complex 3D structures easy for verifying open/short connections and 3D design rules. Using the drag-and-drop Project Management functionality in ADS 2008, the RF-SiP down-converter is inserted into a chirped pulse compression radar system to verify its performance, as shown in Figure 6. This is a complex system comprised from multiple DSP and analog functional blocks to implement chirp signal generator, transmitter, T/R switch, radar terrain signal path model, receiver, chirp-matched ﬁlter compressor, and compressed pulse display processing. The front-end down-conversion is performed by the RF-SiP down-converter described in this article. Figure 7 shows this combination of analog system, DSP, circuit, and EM-level models, co-simulated with ADS 2008’s seamlessly integrated system-circuit-EM high-frequency mixed-signal simulator to show the transmitter chirped spread spectrum and the receiver compressed pulse. The instrument-look of the displayed signals comes from Agilent’s Vector Signal Analyzer displaying the simulated data for direct comparison with actual measurement. Figure 5a, b, and c: Active MMICs circuit used in RF-SiP simulation- 20-40GHz ampliﬁer, 40GHz double-balanced mixer; and 1026.5 GHz frequency doubler. Figure 6: Inserting RF-SiP into a chirped radar pulse compression system using single-click drag and drop project management in ADS 2008. Figure 4: RF-SiP System-Circuit-Physical co-simulation architecture with mix of behavioral, circuit and measurement models. Figure 7: ADS simulated radar chirped transmit spectrum and compressed received pulse displayed on Agilent Vector Signal (VSA) signal analyzer. Microwave Engineering ● January/February 2008 ● www.mwee.com 016_017_018_MWEE.indd 17 22/01/08 14:59:53 http://www.mwee.com

Table of Contents Feed for the Digital Edition of Microwave Engineering Europe - January/February 2008

Microwave Engineering Europe - January/February 2008 Contents News Comment Radio: Raising the Bar for the Radio: Making 802.11n Work Cover Feature: The RF-System-In-Package Trend - Efficient Design with Advanced Design System 2008 Wireless Sensor Networks: The Zigbee PRO Feature Set: More of a Good Thing Very Fast Measurements of Wireless Devices with Small Antennas in Reverberation Chambers WiMAX Update 2008 Bridging the Gap from the CMOS DSP to the Antenna in OFDM Systems Products Calendar

Microwave Engineering Europe - January/February 2008

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