A 54dB-DR 1-GHz-bandwidth continuous-time low-pass filter with in-band noise reduction

Abstract

In this paper a 5 th order low-pass continuous time analog filter in CMOS 45nm technology is presented. The filter design is based on a single compact cell used to synthesize five poles. The circuit performs the low-pass filtering of the in-band signal, while the in-band thermal noise is high-pass filtered, improving Signal-ToNoise-Ratio. 1-GHz -3dB-bandwidth is obtained by a prototype of the filter simulated in 45nm CMOS technology node (also Process-Voltage-Temperature simulations are available). The overall power consumption is 9mW from a single 1.2V supply voltage. 54dB@THD>40dBc is the SNR at 0dB gain. Index Terms-Analog filter, Active RC, Wireless, CMOS 90nm, Low-Power, Low-Voltage.

Continuous Time Analog Filters Design in Nanometerscale CMOS Technologies

“…4, two analog filters circuits implemented in CMOS 45 nm and 28 nm process, currently under development, will be presented for operating in next generation 60 GHz transceivers. In particular the first one is a complete design of a closed-loop 4th order Active-RC low-pass filter able to operate a 1 GHz -3 dB frequency [10,11]. The second filter is based on a super-buffer architecture [12] adequately improved for synthesizing biquadratic cell and amplifiers.…”

“…where a i parameter are function of R-C values, and OP 2 -OP 3 unity gain bandwidth (x u2 and x u3 ) [19].…”

Continuous-time analog filter in CMOS nanoscale era

“…In [27], the design of a 5 th order low-pass filter with noise cancellation technique shown in figure 13 is presented. The idea developed in this design is to perform the 5 th order low-pass filtering by using a single compact cell, where an in-band noise power spectral density high-pass filtering is implemented.…”