Study of 18.2-42.0 GHz Injection-Locked Frequency Doubler with Transformer Input

This paper presents ultra-wideband 18.2-42.0 GHz LC injection-locked frequency doubler (ILFD) with transformer inputs. To expand the locking range, proposed ILFD incorporates connected to source of gain-cell transistor obtain high linearity input circuitry, moreover, matching shifts from free-run oscillator. The measured maximum range exhibited 79.1% 18.2 42.0 output at 0 dBm power and locked phase noise 1MHz offset 28 carrier was −112.1 dBc/Hz under 1.7 mW consumption. Also, lowest 1 MHz −122.8 21.2 consumption, it only 2.2 dB degraded theoretical value. process technology used in this work TSMC-180nm CMOS.