A current-mode continuous-time filter for software defined radio solutions

Abstract

A 3rd-order continuous-time current-mode filter in 65 nm CMOS technology is presented. The filter has a switchable cut-off frequency between 1.1 and 4.4 MHz and is designed for software defined radio on chip (SDR) solutions. An innovative extension to structures in literature is proposed, that allows saving chip area at low cut-off frequencies. Furthermore a mathematical estimation is presented to show the usability of the structure. The realized chip has an active area of 350 lm 9 220 lm and consumes 12.3 mW at 1.2 V. The dynamic range for a bandwidth of 1.1 MHz is 77.2 dB, the in-band output current noise is 31:16 pA= ffiffiffiffiffiffi Hz p and the IIP3 is 1.8 mA p .

Performance Analysis of Multiple FEC Channel Coding Algorithms for Software Defined Radio Using Quadrature Amplitude Modulation

“…Lastly the demodulator recovers the binary digits. It is possible to extract the component in phase by multiplying by a sine (or a cosine) and by a low-pass filter (Uhrmann & Zimmermann, 2008). It involves the multiplication of complex carrier having a negative frequency with the analytic signal obtained from Hilbert Transformer block.…”

Analog Filters in Nanometer CMOS

“…11: Chip area saving 3 rd -order low-pass lter -dierential DC characteristics Experimental results The described 3 rd -order Butterworth low-pass lter is designed and fabricated in 65 nm low-power CMOS technology[UZ09a,UZ07a] as described in chapter 3.…”