This paper describes a fully-passive discrete-time switched-capacitor RF downconverter with an on-chip oscillator, that combines quadrature mixing and harmonic rejection, designed in a 130 nm digital CMOS technology. By using MOS capacitors (varactors) to perform parametric amplification, it is possible to achieve a measured gain enhancement of about 12 dB, together with 21 dB noise figure and more than 5 dBm IIP3. Operating in the VHF-III band, the downconverter core dissipates 6.2 mW and occupies 0.024 mm2.
- Parametric amplication
Custódio, J. R., Bastos, I., Oliveira, L. B., Oliveira, J. P., Pereira, P., Goes, J., & Bruun, E. (2013). A 6.2 mW 0.024 mm2 fully-passive RF downconverter with 12 dB gain enhancement using MOS parametric amplification. Analog Integrated Circuits and Signal Processing, 75(2), 299-304. https://doi.org/10.1007/s10470-013-0049-3