Digitally controlled fully differential voltage‐ and transadmittance‐mode biquadratic filter

Abstract

This study introduces a digitally controlled biquadratic filter operating in fully differential mode and realising voltage and transadmittance functions simultaneously. The proposed circuit is based on the active element namely, digitally current controlled differential voltage current conveyor and three passive components. The proposed circuit offers wide range and non-interactive digital control over filter parameters and also exhibits wide dynamic range. The fully differential nature is well justified by the high common mode rejection ratio of the proposed circuit. Non-ideal and parasitic analyses are performed and extensive simulations carried out to verify the proposed circuit.

Fully Digitally Programmable Generalized Mixed Mode Universal Filter Configuration

“…It uses lowest supply voltage and consumes less power. Only the parameter, in which the proposed DPUF lacks, is the extended range [8]/fine tuning [4,6] of pole frequency. DPUFs of [4,6] attains this feature due to the use of their CDN element [3], which could be operated for large n. Thus, this feature can be easily incorporated in the proposed DPUFs by employing DPCC of [7,29] as they use same CDN.…”

Reconfigurable Mixed Mode Universal Filter

“…It can be seen from Table 3 that all the digitally programmable filters except that of [14,15] operate either in VM or current mode (CM) only. DPUF of [15] operates in VM and transadmittance mode (TAM) but it realizes three filter functions only and also misses the programmability feature of gain and filter type. Similarly, DPUF of [14] also misses number of features (nos.…”

“…Additionally, filter of [8] requires weighted current/voltage ratios and input (voltage) inversion constraint. OTA based filters [5][6][7][8] and that of [16] are considered here because the digital control (as given in [15]) can be easily incorporated in these structures Figure 6: Third derived DPUF.…”

“…Almost at same operating frequency, [5] dissipates power of 1.57 mW only. Power consumption of [15] is also high (6 mW) but it operates at higher frequency of 14 MHz.…”

Carbon Nanotubes-Based Digitally Programmable Current Follower

“…MOS device dimensions have already reached the nanometer regime. CMOS technology scaling suggests that this technology is nearing fundamental physical limits [1][2][3]. Therefore, researchers are looking for the emerging devices which can overcome the issues of CMOS.…”