A New Low-Voltage Low-Power Dual-Mode VCII-Based SIMO Universal Filter

Abstract

In this paper, a new low-voltage low-power dual-mode universal filter is presented. The proposed circuit is implemented using inverting current buffer (I-CB) and second-generation voltage conveyors (VCIIs) as active building blocks and five resistors and three capacitors as passive elements. The circuit is in single-input multiple-output (SIMO) structure and can produce second-order high-pass (HP), band-pass (BP), low-pass (LP), all-pass (AP), and band-stop (BS) transfer functions. The outputs are available as voltage signals at low impedance Z ports of the VCII. The HP, BP, AP, and BS outputs are also produced in the form of current signals at high impedance X ports of the VCIIs. In addition, the AP and BS outputs are also available in inverting type. The proposed circuit enjoys a dual-mode operation and, based on the application, the input signal can be either current or voltage. It is worth mentioning that the proposed filter does not require any component matching constraint and all sensitivities are low, moreover it can be easily cascadable. The simulation results using 0.18 μm CMOS technology parameters at a supply voltage of ±0.9 V are provided to support the presented theory.

Voltage-Mode Multifunction Biquad Filter and Its Application as Fully-Uncoupled Quadrature Oscillator Based on Current-Feedback Operational Amplifiers

“…Input and output power gain is the relationship of output power = input power + gain. To evaluate the linear range of the VM biquad filter, consider the BPF, LPF and BRF in Equations (1) to (3). Figure 16 shows the measured P1dB of the BPF at an input power with a center frequency of 102 kHz.…”

“…Voltage-mode (VM) analog active filters and oscillators using different active components have received extensive attention. Some innovative approaches to realize VM biquad filters [ 1 , 2 , 3 , 4 ] and oscillators [ 5 , 6 , 7 , 8 , 9 ] can be found in the open study. Single-input three-output VM multifunction biquad filters, such as band-pass filter (BPF), low-pass filter (LPF), high-pass filter (HPF) or band-reject filter (BRF), are applied to the phase-locked loop, the high fidelity 3-way speaker, the touch-tone telephone tone decoder, and the phase sensitive detection (PSD) [ 8 , 9 , 10 , 11 ].…”

Universal Filter Based on Compact CMOS Structure of VDDDA

“…The versatile biquad filter that gives multiple filtering functions within the same configuration is well-known as the universal or multifunction filter. In the open literature, this type of active filter has been proposed continuously [ 8 , 9 , 10 , 11 , 12 ].…”

One input voltage and three output voltage universal biquad filters with orthogonal tune of frequency and bandwidth

“…Several SIMO second order voltage mode universal filters using different analog active function blocks have been published in the literature . However, these reposed filters have some inconveniences as it has been observed that the active building blocks are not implemented from the commercially available IC [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][36][37][38][39][40][41][42][43]; all capacitors are not grounded [14,18,29,42], the natural frequency is not electronically tuned 36], absence of orthogonal tune of the 0 and Q [13-16, 18-24, 29, 30, 35, 36, 40, 41, 43, 46, 47], the passband voltage gain is not constant during tuning the natural frequency and quality factor [14, 17, 18, 20, 25, 26, 28, 29, 32-34, 36, 38, 39, 42].…”