Title :
An HBT MMIC wideband VCO
Author :
Adar, A. ; Ramachandran, R.
Author_Institution :
Pacific Monolithics, Sunnyvale, CA, USA
Abstract :
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).<>
Keywords :
III-V semiconductors; MMIC; aluminium compounds; bipolar integrated circuits; gallium arsenide; heterojunction bipolar transistors; microwave oscillators; tuning; variable-frequency oscillators; 7 to 15 GHz; AlGaAs-GaAs; HBT; MMIC; SHF; biasing circuitry; broadband; buffer amplifier; heterojunction bipolar transistors; load isolation; matching circuitry; monolithic microwave integrated circuit; power output stability; tuning range; voltage controlled oscillator; wideband VCO; Bipolar integrated circuits; Circuit optimization; Circuit testing; Heterojunction bipolar transistors; MMICs; Microwave integrated circuits; Monolithic integrated circuits; Power amplifiers; Voltage-controlled oscillators; Wideband;
Conference_Titel :
Microwave and Millimeter-Wave Monolithic Circuits Symposium, 1991. Digest of Papers, IEEE 1991
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-0087-4
DOI :
10.1109/MCS.1991.148092
