Title :
Design techniques for VHF/UHF high-Q tunable bandpass filters using simple CMOS inverter-based transresistance amplifiers
Author :
Lu, Ping-Hsing ; Wu, Chung-Yu ; Tsai, Ming-Kai
Author_Institution :
Chip Implementation Center, Nat. Sci. Council, Hsin-chu, Taiwan
fDate :
5/1/1996 12:00:00 AM
Abstract :
In this paper, CMOS inverter-based wideband transresistance Rm amplifiers are proposed and analyzed. Using the Rm amplifiers, tunable VHF/UHF Rm-C bandpass biquadratic filters can be designed. In these filters, the center frequency f0 can be post-tuned by adjusting the control voltages of the Rm amplifiers. The pseudodifferential configuration uses the extra inversely connected and self-shorted inverters for Q enhancement. Experimental results have shown that the center frequency f0 of the single-ended-output Rm-C bandpass biquad is 386 MHz (258 MHz) and Q=1.195 (Q=1.012) for ±2.5 V (±1.5 V) supply voltage. The power consumption is 24.83 mW (3.42 mW), and the dynamic range is 61 dB (55.5 dB). For pseudodifferential-output high-Q configuration, the measured quality factor Q can be as high as 360 with f0=222.7 MHz. When Q=94, the power consumption is 56.2 mW and the measured dynamic range is 57.8 dB for 12.5 V supply voltage
Keywords :
CMOS analogue integrated circuits; Q-factor; UHF filters; VHF filters; band-pass filters; biquadratic filters; circuit tuning; equivalent circuits; integrated circuit design; linear network synthesis; 1.5 V; 2.5 V; 222.7 to 386 MHz; 24.83 mW; 3.42 mW; 56.2 mW; CMOS inverter-based transresistance amplifiers; Q enhancement; UHF; VHF; active RF filters; biquadratic filters; design techniques; high-Q tunable bandpass filters; power consumption; pseudodifferential configuration; quality factor; Band pass filters; Broadband amplifiers; Dynamic range; Energy consumption; Frequency; Inverters; Power measurement; Q factor; Q measurement; Voltage control;
Journal_Title :
Solid-State Circuits, IEEE Journal of
