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.
Highlights
Filters are among the most widely used circuits in different areas such as instrumentation, communication, control, and signal processing systems [1,2,3,4,5]
Filters were designed in voltage mode using active devices such as operational amplifiers (Op-Amp)
The inherent low-voltage nature of current-mode signal processing has motivated a wide investigation on current-mode filters with the aim of achieving better results under low supply voltage restrictions
Summary
Filters are among the most widely used circuits in different areas such as instrumentation, communication, control, and signal processing systems [1,2,3,4,5]. The CDBA-based multifunction filter of [9] provides low impedance for all voltage outputs, it has the load and other passive elements connected to output ports, so the output ports must be designed to have high current drive capability These will result in a complicated internal circuit for the used CDBA. Has attracted the attention of researchers [19,20] It is the dual of well-known second-generation current conveyor (CCII) and, compared to other active building blocks, enjoys a simple internal structure and features more design flexibility. It is characterized by a low-impedance current input port, a high-impedance current output port and a low-impedance voltage output port.
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