Power Oriented Design of Linear Phase FIR Filters

In the design of low computational complexity and low power FIR filters, researchers have made every effort to reduce the number of adders when coefficients multipliers are considered as the multiple constant multiplication problem. In this paper, for the first time, we propose a power oriented optimization of linear phase FIR filters, where a power cost is used as the criteria in the discrete coefficient searches and synthesis. The power cost is computed based on a newly proposed power model, which takes both the static power and dynamic power into consideration. With the new power model, a new coefficient synthesis scheme is proposed such that the synthesized coefficient consumes the minimum power. Compared to the adder-cost oriented algorithm, the proposed power-oriented algorithm has two advantages: First, the algorithm can optimize filters with lower power consumption, and second, the optimal design in the sense of power consumption is frequency aware. Unlike the adder-cost oriented algorithms that generate the same final coefficient set and the same synthesis of the coefficient set regardless of the frequency for a given filter specification, the proposed algorithm search and synthesizes the coefficients with the awareness of the working frequency; different designs may be resulted for the same filter specification but different working frequency, and each designed filter has lower power consumption in its specified frequency. Transistor level simulations of benchmark filters verified the above claims.

Extending Object-Z Formal Specification with Real-Time

This paper extends Object-Z with Real-Time and describes the characters of real-time system: delay, timeout and multithread. Real-Time Object-Z consists two parts: functional specification and filter specification. The both for any time critical system can be developed with two parts. Functional specification developed with Object-Z formerly can be reused. The main benefit is that it is convenient to deal with the timing variables defined in the specification developed with our approach. Using our approach, we can develop real-time specification and reason about the real-time properties conveniently.

A Phasor Approach to Digital Filters

Expressions for the frequency response of digital filters can be obtained using phasors, in a way very similar to the familiar analysis of simple analogue networks. These expressions can then be generalized as an informal route to the z-plane, pole-zero filter specification, and even the z-transform of sample sequences.

A Comparison of Three Active Analogue Band-Pass Filter Circuits

This tutorial paper outlines the design procedure and compares the response of three different forms of active band-pass filter circuit, which are designed to meet the same basic filter specification. The paper shows in particular how the response varies with the spread of operational amplifier gain-bandwidth product; this spread exists, in practice, amongst operational amplifiers of any given type.