Title :
An HBT MMIC wideband VCO
Author :
Adar, A. ; Ramachandran, R.
Author_Institution :
Pacific Monolithics, Sunnyvale, CA, USA
Abstract :
A wideband monolithic microwave integrated circuit (MMIC) 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 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 the chip, which measures 30 mil*40 mil (0.8 mm*1 mm).<>
Keywords :
III-V semiconductors; MMIC; aluminium compounds; bipolar integrated circuits; gallium arsenide; heterojunction bipolar transistors; microwave oscillators; variable-frequency oscillators; 7 to 15 GHz; AlGaAs-GaAs; MMIC; buffer amplifier; heterojunction bipolar transistors; load isolation; matching circuitry; minimum output power; monolithic microwave integrated circuit; phase noise; power dissipation; power output stability; tuning range; voltage controlled oscillator; Bipolar integrated circuits; Circuit testing; Gallium arsenide; Heterojunction bipolar transistors; MMICs; Microwave integrated circuits; Monolithic integrated circuits; Power amplifiers; Voltage-controlled oscillators; Wideband;
Conference_Titel :
Microwave Symposium Digest, 1991., IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-87942-591-1
DOI :
10.1109/MWSYM.1991.146974
