C-band Down Converter Front End

• SPI & IIC control functions
• Low cost microstrip/stripline preselectors; SAW IF
• Low noise, high IP3 design
• Analog/digital demodulation to A/D

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50-700 MHz 1Watt Power Amplifier

• Compact Design
• +31dBm typical P1dB at 25C
• +46dBm IP3
• 40% PAE

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UHF Octave Tunable Deep Notch Filter

• Octave tuning range
• 40 - 50 dB notch depth, typ.
• 6% notch bandwidth
• Highly compact design

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UHF Octave Tunable Narrow-Bandpass Filter

• 225 - 450 MHz Tuning Range
• 6% 3dB Bandwidth
• 20 dBm P1dB

VHF 30-88 MHz 2W Tunable Bandpass Filter

• Switched-capacitor design to reject interferor greater than 1W
• Unique tapped-inductor design saves space
• Integrated voltage inverter and TTL drivers
• 8-bit tuning

VCO Phase Noise Analysis

• Accurate modeling of resonator Q and active device noise sources
• Predicts VCO phase noise for Si and GaAs devices to within a few dB
• Predicts biasing trend of phase noise behavior

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Microwave HFSS Modeling of Microstrip Filter

• Modeling packaging effects, conductor thickness, finishing effects
• Variational analysis on material properties, manufacturing dimensional tolerances, and dielectric tolerances

Tolerance analysis showing effects on passband

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HFSS Modeling of Coaxial Filter

User-Defined Model in Ansoft Designer

• Custom model implementation for linear, nonlinear, and system behavioral models
• Analytic and automatic derivatives for rapid implementation and execution in compiled models
• Interpretive user-defined models
• Devices we've incorporated include:
  • MESFET & PHEMT (Materka, Chalmers, Raytheon, Curtice)
  • Si Bipolar (full Gummel-Poon)
  • HBT
  • PIN
  • Various passive RF device and distributed models

Electro-thermal HBT Modeling

• Considers each device finger as a heat generator
• Derive the thermal network as seen by each finger and use a coupled electro-thermal set of device equations within a harmonic-balance simulator
• Computes accurate DC IV and dynamic performance of a device
• Accurately models current collapse in an HBT

Equivalent circuit network

Computed normalized temperature of each finger

Computed DC IV with current collapse

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Parameter Extraction of NE71000 MESFET

• DC IV data
• S-parameter data over bias
• Power compression and harmonic data

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GUI Board Control

• Visual Basic custom user interface development
• Control of parallel power for discrete I/O, SPI bus, and IIC bus emulation
• USB interface to DAQ modules for discrete and analog I/O, e.g. MCC USB1208-FS
• Common RF device control, e.g. synthesizers, A/D, D/A, filter tuning, switches, etc.

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COM & WINSOCK Equipment Control

• Visual Basic custom user interface development
• WINSOCK & COM programming to measurement equipment over ethernet
• GPIB programming to measurement equipment over IEEE 488
• Control of network analyzer, spectrum analyzer, DSO, signal generators, DMMs, etc.
• Automatic population of formatted data and direct insertion into Excel for rapid data reduction and presentation

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