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This paper presents the development of a 24-GHz monolithic frequency source using InP-based HEMT-HBT integration technology. This frequency source consists of a 24-GHz HBT voltage controlled oscillator (VCO) and a HEMT buffer amplifier, and was fabricated on a single 3-mil thick InP substrate. It exhibits a measured oscillation frequency of 24.6 GHz with an output power of 4.2 dBm. This is the first successful demonstration of MMIC using InP-based HEMT-HBT integration technology.