Design and measurement of a 53 GHz balanced Colpitts oscillator
53-GHz平衡式考毕兹振荡器的设计与测试

A 53 GHz Colpitts oscillator implemented in a SiGe:C BiCMOS technology is presented. Limited by a 26.5 GHz frequency analyzer, the oscillator was measured indirectly through an on-chip mixer. The mixer down-converted the oscillating frequency to an intermediate frequency (IF) below 26.5 GHz. By adjusting the local oscillating (LO) frequency and recording the changes of IF frequency, the oscillator's output frequency (RF) was determined. Additionally, using phase noise theory of mixers, the oscillator's phase noise was estimated as -58 dBc/Hz at 1 MHz offset and the output power was about --21 dBm. The chip is 270×480 μm2 in size.