A CMOS 80mW 400MHz seventh-order MLF FLF linear phase filter with gain boost

A 400MHz CMOS seventh-order linear phase gm-C filter based on current-mode (CM) follow-the-leader-feedback (FLF) structure is realized. The filter is implemented using a fully-differential linear operational transconductance amplifier (OTA) based on source degeneration topology. PSpice simulations in a standard TSMC 0.18mum CMOS process and with 2.5V power supply have shown that the cut-off frequency of the filter ranges from 290MHz to 430MHz and dynamic range is about 54dB. The group delay ripple is approximately 6% over the whole tuning range and total power consumption is only 78.7mW at 400MHz cut-off frequency.

[1]  Edgar Sánchez-Sinencio,et al.  Low-Power Architecture and Circuit Techniques for High-Boost Wide-Band $G_m$–$C$ Filters , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[2]  Rolf Schaumann,et al.  Performance comparison of high-order IFLF and cascade analogue integrated lowpass filters , 2000 .

[3]  J. K. Fidler,et al.  Current-mode OTA-C realisation of arbitrary filter characteristics , 1996 .

[4]  Takashi Morie,et al.  A 200-MHz seventh-order equiripple continuous-time filter by design of nonlinearity suppression in 0.25-/spl mu/m CMOS process , 2002 .

[5]  Yichuang Sun,et al.  A CMOS 650 MHz seventh-order current-mode 0.05° equiripple linear phase filter , 2007, 2007 50th Midwest Symposium on Circuits and Systems.

[6]  Yichuang Sun,et al.  A 0.18μm CMOS 9mW current-mode FLF linear phase filter with gain boost , 2007, 2007 50th Midwest Symposium on Circuits and Systems.

[7]  José Silva-Martínez,et al.  A CMOS 140-mW fourth-order continuous-time low-pass filter stabilized with a class AB common-mode feedback operating at 550 MHz , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[8]  Rolf Schaumann,et al.  A CMOS fully-balanced continuous-time IFLF filter design for read/write channels , 1996, 1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96.

[9]  Yichuang Sun,et al.  Performance Analysis and Comparison of Multiple Loop Feedback Ota-c Filters , 2005, J. Circuits Syst. Comput..