This paper demonstrates a 4-GHz monolithic SiGe heterojunction bipolar transistor quadrature voltage-controlled oscillator (QVCO) using superharmonic coupling topology. The QVCO at 4.17 GHz has phase noise of -116 dBc/Hz at 1 MHz offset frequency, output power of -6 dBm, and the figure of merit -179 dBc/Hz. The core current consumption is 3.2 mA at 3 V supply voltage. The die size is about 1.4 mm × 1.2 mm.
- Phase noise
- Quadrature voltage-controlled oscillator (QVCO)
- SiGe heterojunction bipolar transistor (HBT)
- Superharmonic coupling