A 3rd-order current-mode filter in 0.12 μm CMOS

Abstract

Abstract. For software radio applications in system-onchips, a 3rd-order current-mode Butterworth filter in 120 nm CMOS is realized. This filter is used for reconstruction purposes between a current-steering DAC and a current-mode mixer. Power can be reduced by using a current-mode architecture. The cut-off frequency of this filter is switchable between 1 MHz and 4 MHz, the current consumption is 4.5 mA at V DD =1.5 V, the inband noise density is 100 pA/ √ H z and it has a dynamic range up to 65 dB.

Design and Experimentation of Inductorless Low-Pass NGD Integrated Circuit in 180-nm CMOS Technology

“…The circuit parameters were calculated by using the synthesis formulae of the LP-NGD POC given earlier in equation (7) for R1, equation ( 9) for R and equation (10)…”

“…and the capacitor: (10) Thanks to the established synthesis formulas, ideal circuit parameters are calculated in the following subsection from the desired NGD specifications.…”

“…The CMOS design is the most promising, efficient, and good enormous trade-off solution in term of circuit miniaturization. So far, various classical electronic functions as amplifier [3][4], low-voltage signal processor [5], several aspects of filters [6][7][8][9][10][11][12][13][14], PLL [15], transconductors [16], were designed in CMOS technology are available in the literature. Design method of CMOS amplifier with precise and stable DC gain was introduced [3][4].…”

“…The expected advantages of CMOS technology are the low-power consumption [5][6] and compact [7] circuit design. One of most expanded circuit designs are expected for filters with different characteristics as continuous time [6,9], log-domain [7], AC-powered [8], nanometer technology [10][11][12], enhanced adaptive, Q-tuning scheme [13] and high dynamic range [14] filters. Despite the development of the CMOS design technology of analog circuit, the designability of certain unfamiliar analog functions as the low-pass (LP) negative group delay (NGD) circuits [17][18][19][20] remain one of open questions.…”