Abstract
This paper presents a novel mixed mode universal filter configuration capable of working in voltage and transimpedance mode. The proposed single filter configuration can be reconfigured digitally to realize all the five second order filter functions (types) at single output port. Other salient features of proposed configuration include independently programmable filter parameters, full cascadability, and low sensitivity figure. However, all these features are provided at the cost of quite large number of active elements. It needs three digitally programmable current feedback amplifiers and three digitally programmable current conveyors. Use of six active elements is justified by introducing three additional reduced hardware mixed mode universal filter configurations and its comparison with reported filters.
Highlights
Current feedback amplifier (CFA) plays significant role in area of signal processing/generation because of its higher speed, higher slew rate, simpler circuit realization, and most importantly the independence of gain and bandwidth [1,2,3]
This paper presents a novel reconfigurable voltage/transimpedance mode (VM/TIM) Digitally programmable universal filters (DPUF) using three digitally programmable CFAs (DPCFA) and three digitally programmable second generation current conveyors (DPCCII)
The concept of digital control in DPCFA/DPCCII is based on employing an n-bit current summing network (CSN), which scales up or scales down the current gain of conventional CFA/CCII [1]
Summary
Current feedback amplifier (CFA) plays significant role in area of signal processing/generation because of its higher speed, higher slew rate, simpler circuit realization, and most importantly the independence of gain and bandwidth [1,2,3]. This paper presents a novel reconfigurable voltage/transimpedance mode (VM/TIM) DPUF using three digitally programmable CFAs (DPCFA) and three digitally programmable second generation current conveyors (DPCCII). The proposed DPUF configuration is (1) fully programmable as all the coefficients of its transfer function are independently controlled, which makes its parameters, namely, pole frequency (ω0), quality factor (Q), and gain (G) independently programmable (2) fully cascadable by virtue appropriate (low/high for voltage/current) input and (low for voltage) output port impedances (3) less sensitive to nonidealities and parasitic effects. The concept of digital control in DPCFA/DPCCII is based on employing an n-bit current summing network (CSN), which scales up (amplification) or scales down (attenuation) the current gain of conventional CFA/CCII [1]. It shows ith DPCFA/DPCCII block with current gain Ki± and applied codeword K
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