A 67-dB Harmonic-Rejecting CMOS LNA with Area-Efficient Stacked-Inductor Self-Resonance

A local oscillator requires low timing jitter to receive higher-order modulated signals correctly. We propose a small-footprint LNA with embedded notch filters that extract only the desired frequency from an optoelectronic oscillator which outputs extremely low jitter. Conventional notch filters implemented with resonators need to lay out inductors and capacitors separately, making it difficult to reduce the area. In this study, we utilize an area-efficient stacked-inductor self-resonance instead of the conventional design. The resulting circuit has a gain difference between the desired frequency and the harmonics of 67.4 dB and a 7.3 times smaller area than the conventional one.