| Title |
A CMOS Low-pass Filter With Group Delay Cancellation using Non-Foster Element Circuits |
| Authors |
(Quang-Huy Do);(Tan-Binh Ngo);(Sang-Woong Yoon) |
| DOI |
https://doi.org/10.5573/JSTS.2024.24.2.105 |
| Keywords |
Low-pass filter; negative capacitance; negative group delay; negative inductance; non-Foster resonator |
| Abstract |
We presented a CMOS lumped-element (LE) low-pass filter (LPF) with a group delay (GD) cancellation technique that uses parallel resonators comprising negative inductance and negative capacitance circuits. An inherent positive GD from the LEs of the LPF is canceled by a negative GD from the resonator. The LPF was implemented in the Global Foundry 8SF 130-nm RF CMOS Integrated Circuit (IC) technology. The core chip size was 1135 μm ? 474 μm. The maximum passband frequency of the LPF was measured to be 1.5 GHz with a return loss of more than 10 dB, in-band loss of 0.8?2.4 dB, and out-of-band roll-off rate of 41.5 dB/GHz. The GDs at frequencies below 1 GHz were 0.31?0.33 ns and decreased to zero at 1.51 GHz. The noise figures were around 13.4?17.7 dB. |