A inverter based filter design is proposed that uses only MOSCAPs as filter capacitors. Further in the design the load capacitance compensates the negative feedback network allowing the majority of current to flow into the load. This results in an increase in the overall power efficiency. As a proof of concept, a 3rd order inverter based 34-314 MHz tunable continuous time channel select filter for software-defined radios is fabricated in TSMCs 65nm technology. By using the high density tunable MOSCAPs at a low swing node, the filter achieves an OIP3 of +25.24 dBm while drawing 4.2mA from a 1.1V supply and occupies an area of 0.007mm2. The measured intermodulation distortion varies by 5dB across a 120° variation in temperature and 6.5dB across a 200mV variation in power supply. Further, the filter presents a high impedance node at the input and a low impedance node at the output easing system integration.
|Original language||English (US)|
|Title of host publication||2015 IEEE Custom Integrated Circuits Conference, CICC 2015|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|State||Published - Nov 25 2015|
|Event||IEEE Custom Integrated Circuits Conference, CICC 2015 - San Jose, United States|
Duration: Sep 28 2015 → Sep 30 2015
|Name||Proceedings of the Custom Integrated Circuits Conference|
|Other||IEEE Custom Integrated Circuits Conference, CICC 2015|
|Period||9/28/15 → 9/30/15|
Bibliographical noteFunding Information:
This research was supported in part by a grant from DARPA.
© 2015 IEEE.