1. 1 A Literature Review About Q-enhancement Filter design

2. 2 Q-enhancement Filter The main idea is to compensate the loss of inductors by Negative Resistance. Conventional negative resistance.

3. 3 Q-enhancement Filter A coupled resonator filter by means of mutual inductance Kuhn, W.B.; et.al, "A 200 MHz CMOS Q-enhanced LC bandpass filter," Solid-State Circuits, IEEE Journal of, vol.31, no.8, pp.1112-1122, Aug 1996

4. 4 Q-enhancement Filter Emulation of mutual inductance by g m s. Mohieldin, A.N.;et.al., "A 2.7-V 1.8-GHz fourth-order tunable LC bandpass filter based on emulation of magnetically coupled resonators,“Solid-State Circuits, IEEE Journal of, vol.38, no.7, pp. 1172- 1181, July 2003 Flexibility in changing the BW. f 0 (GHz)1.8 BW(MHz)80 Order4 NF(dB)37 1dB CMP-25 Tech.(um)0.5

5. 5 Q-enhancement Filter The loss behavior of inductor Compensate the loss in a finite bandwidth Pass-band distortion

6. 6 Q-enhancement Filter Coupled inductor negative resistance Implementation of the idea.

7. 7 Q-enhancement Filter A 6 th order Coupled resonator BPF. f 0 (GHz)2.14 BW(MHz)60 IIP 3 (dBm)-5 NF(dB)19 Die area(mm 2 )3.5 Tech(um)0.25 Another disadvantage of Q-enhancement filter: 1.They need a automatic tuning circuit 2. The tuning range of f 0 is limited. Soorapanth,et al. "A 0-dB IL 2140±30 MHz bandpass filter utilizing Q-enhanced spiral inductors in standard CMOS," Solid-State Circuits, IEEE Journal of, vol.37, no.5, pp.579-586,May2002

8. 8 Q-enhancement Filter f 0 (GHz)2.44 BW(MHz)100 Order6 IIP 3 (dBm)-15 NF(dB)23 Tech(um)0.18 Another Negative resistance Implementation of the filter Georgescu, B.; et. Al,"Tunable coupled inductor Q-enhancement for parallel resonant LC tanks," Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on, vol.50, no.10, pp. 705- 713, Oct. 2003 For stability issues

9. 9 Q-enhancement Filter Inductor enhancement For constant ω, also the effective Q will increase Albertoni, F.; et.al"Tuned LNA for RFICs using boot-strapped inductor," (RFIC) Symposium, 2001. Digest of Papers. 2001 IEEE, vol., no., pp.83-86, 2001

10. 10 Q-enhancement Filter The parallel resistance of inductor has strong dependency on ω. Cross-coupled g m with LC degeneration Georgescu, B.; Finvers, I.G.; Ghannouchi, F., "2 GHz Q-Enhanced Active Filter With Low Passband Distortion and High Dynamic Range,“ Solid-State Circuits, IEEE Journal of, vol.41, no.9, pp.2029-2039, Sept. 2006

11. 11 Q-enhancement Filter It is proposed to use Q-enhancement filter for transmitter side. Wiser, R.F.;et.al; Su, D.K.; "A 5-GHz Wireless LAN Transmitter with Integrated Tunable High-Q RF Filter,“ Solid-State Circuits, IEEE Journal of, vol.44, no.8, pp.2114-2125, Aug. 2009 By staggering, tuning the filter is easier.