Abstract
This paper presents Signal Flow Graph (SFG) approach-based realization of Single Input Multiple Output (SIMO) filter topologies. A differentiator is placed as basic building block. A total of sixteen variants are derived from the proposed differentiator-based SFG. The Operational Trans-Resistance Amplifier (OTRA), an active block having low parasitics at input terminals, is used to validate the proposed methodology. All the derived filter structures use three OTRAs, six resistors and two capacitors. The filter performance parameters can be adjusted independently. The functional verification of the proposed method is done via SPICE simulations using 0.18 μm CMOS technology parameters from MOSIS.
Highlights
IntroductionFilters [1], [8], [10], [16] and [18] impose condition on component/switch selection for obtaining the responses
The Continuous-Time (CT) filters are widely used in consumer electronics, instrumentation, military ordnance, telecommunications and radar systems, etc
The bandwidth of traditional active blocks is limited by closed-loop voltage gain and presence of the parasitic elements influences the performance of filter
Summary
Filters [1], [8], [10], [16] and [18] impose condition on component/switch selection for obtaining the responses. Considerable research efforts have been devoted to developing CT filters based on wide variety of active blocks. The bandwidth of traditional active blocks is limited by closed-loop voltage gain and presence of the parasitic elements influences the performance of filter. The researchers have developed few differentiator-based signal processing and generating circuits [7], [8], [9], [15], [20], [21], [22], [23], [24], [25], [26], [27] and [28] finding applications in the area of control system and biomedical instrumentation. Differentiator-based SIMO filter topologies designed using SFG-based approach are proposed in this paper and OTRA is used to validate it. Vo includes the discussion on the proposed SFG, followed k by a brief review of OTRA and basic signal processing blocks designed using OTRA. SIMO filter topologies are included in the same section subsequently.
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