Chebyshev Bandpass Filter Using Resonator of Tunable Active Capacitor and Inductor

Table 2

The previously reported several works by using the same structure of classic Chebyshev bandpass filter.

	[1]	[2]	[5]	[6]	[7]	[8]	This work
Technology process	CMOS; 0.18 µm	CMOS; 0.18 µm	BJT; BFP420	BJT; BFR92A	BJT; BFR92A	CMOS; 0.18 µm	CMOS; 0.18 µm
Active component	Active capacitor	—	Active inductor	Active inductor	Active inductor	—	Active capacitor/inductor
Order	2	2	3	2	1	3	2
Center frequency (MHz)	5300	23500	1950	2100	600	2368	758
BW (MHz)	1700	4000	10	15	300	60	7.1
Pass band gain (dB)	0.77	1.65	−8	0	0.1	1.8	18.1
Stopband rejection (dB)	36.8	15.2	—	—	—	30	50
Power (mW)	2.2	4.2	4	—	120	8.8	25.5
Quality factor	3	6	195	140	2	40	107
Tunability
Center freq. (MHz)	—	—	1800~2050	—	—	—	758~864
Gain (dB)	—	—	−8	—	—	—	6.5~18.1
BW (MHz)	—	—	10	—	—	—	7.1~65.9
Quality factor	—	—	180~205	—	—	—	12~107