Fixed Gain Amplifier Used within the Feed Back

Fixed Gain Amplifier Used within the Feed Back Loop

GALI - 3 • Ordered from Mini-Circuits. • Surface mount package. • Benefits over previous amplifier. – Higher Gain – Lower Noise Figure – Lower output return loss

• Draw back with amplifier – Gain • Do not know how much gain is needed • GALI-3 amplifier has fixed gain • Are currently searching for variable gain controlled amplifier • Usability – May need variable attenuator within feed back loop – If gain is too high will use at output of VCO

Design • Used S-Parameters obtained from manufacturer. – Created component with GALI-3 S-Parameters – Simulated amplifier using HPADS • compared with manufacturer S-Parameter vs. Frequency graphs.

• DC Biasing Network – Need DC Bias for operation – Plan to simulate on HPADS on Feb. 26, 2002 • Will use biasing network provided by manufacturer. • Will choose component values as per manufacturer specifications. – HPADS simulation will be used for comparison with Measured S-Parameter results.

HPADS Amplifier Design

S-Parameter Vs. Frequency

Progress Made • First Week – searched for Varactor Diode • Second Week – searched for fixed gain amplifier • Third Week – searched for variable gain amplifier • Fourth Week – Simulated GALI-3 on HPADS

Abstract This presentation contains progress made on Voltage Controlled Oscillator project. Specifications and simulations of the Distributed Amplifier simulations, Power Divider simulations, Tunable Band-Pass filter design and simulations, and Feed Back Amplifier are discussed. Progress made and problems encountered are also contained within this progress presentation.

Voltage Controlled Oscillator Using Distributed Amplifier Design.