An HBT MMIC wideband VCO

A wideband MMIC (monolithic microwave integrated circuit) voltage controlled oscillator (VCO) has been developed using AlGaAs-GaAs heterojunction bipolar transistors (HBTs). Test results indicate a very wide tuning range of 7 to 15 GHz, with a minimum output power of 9 dBm. This MMIC also exhibits low power dissipation (5 V and 25 mA) and excellent phase noise (75 dBc/Hz at 100 kHz) for a broadband VCO. In addition to the basic oscillator this MMIC also includes a buffer amplifier to provide better load isolation and power output stability. All the required biasing and matching circuitry except for the resonator is contained within a chip that measures 30*40 mils (0.8 mm+or-1 mm).<
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