Abstract
Three voltage mode universal filter biquads using digitally programmable second generation current conveyor (CCII) are presented in this paper. Salient features of proposed filter configurations include realization of all the filter functions except allpass, independently programmable filter parameters, no component matching constraint and low sensitivity figure. Component count of proposed filter configurations is proved to be minimal for offering aforementioned set of features. Workability of proposed circuit is verified by including the SPICE simulations.
Highlights
Programmable characteristic of analog block is essential in many applications
The proposed Digitally programmable universal filter (DPUF) offer attractive features such as (1) independently programmable filter parameters namely pole frequency (ω0) and quality factor (Q); (2) cascadability; (3) no component matching constraint; and (4) low sensitivity figure. For obtaining all these features, proposed DPUFs use three digitally programmable CCIIs (DPCCIIs), one voltage follower (VF) and five passive components including two capacitors only. This component count is proved to be minimal for any current mode (CM)/voltage mode (VM) DPUFs, which provides all these features
One additional advantage offered by DPUF is the programming of ω0 in either direction by reversing the gain parameter of respective block i.e. changing the gain K+ of DPCCII-2, 3 by K− or vice versa (Equation (5a))
Summary
Programmable characteristic of analog block is essential in many applications. It is required to compensate for the undesired parameter variation caused by temperature and process. The proposed DPUFs offer attractive features such as (1) independently programmable filter parameters namely pole frequency (ω0) and quality factor (Q); (2) cascadability; (3) no component matching constraint; and (4) low sensitivity figure. For obtaining all these features, proposed DPUFs use three digitally programmable CCIIs (DPCCIIs), one voltage follower (VF) and five passive components including two capacitors only. This component count is proved to be minimal for any current mode (CM)/VM DPUFs, which provides all these features.
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