Ge on Si waveguide-integrated photodiodes for high speed and low power receivers

: A Linear Feedback Shift Register (LFSR) considers a linear function typically an XOR operation of the previous state as an input to the current state. This paper describes in detail the recent Wireless Communication Systems (WCS) and techniques related to LFSR. Cryptographic methods and reconfigurable computing are two different applications used in the proposed shift register with improved speed and decreased power consumption. Comparing with the existing individual applications, the proposed shift register obtained >15 to <=45% of decreased power consumption with 30% of reduced coverage area. Hence this proposed low power high speed LFSR design suits for various low power high speed applications, for example wireless communication. The entire design architecture is simulated and verified in VHDL language. To synthesis a standard cell library of 0.7um CMOS is used. A custom design tool has been developed for measuring the power. From the results, it is obtained that the cryptographic efficiency is improved regarding time and complexity comparing with the existing algorithms. Hence, the proposed LFSR architecture can be used for any wireless applications due to parallel processing, multiple access and cryptographic methods.

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VLSI Implementation of High Speed-Low Power-Area Efficient Multiplier Using Modified Vedic Mathematical Techniques

Recent Patents on Computer Science ◽

10.2174/2213275908666150220203501 ◽

2017 ◽

Vol 9 (3) ◽

pp. 216-221

Author(s):

Abdul Kareem ◽

Vardhana M. ◽

Praveen Kumar

Keyword(s):

Low Power ◽

High Speed ◽

Vlsi Implementation ◽

Mathematical Techniques ◽

Area Efficient

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Low Power and High Speed Sequential Circuits Test Architecture

Recent Patents on Computer Science ◽

10.2174/2213275912666191107102512 ◽

2019 ◽

Vol 12 ◽

Author(s):

Ahmed K. Jameil ◽

Yasir Amer Abbas ◽

Saad Al-Azawi

Keyword(s):

Power Consumption ◽

Low Power ◽

Test Generation ◽

High Speed ◽

Fir Filter ◽

Sequential Circuits ◽

Fir Filters ◽

Design Verification ◽

Sequential Circuit ◽

Generation Algorithm

Background: The designed circuits are tested for faults detection in fabrication to determine which devices are defective. The design verification is performed to ensure that the circuit performs the required functions after manufacturing. Design verification is regarded as a test form in both sequential and combinational circuits. The analysis of sequential circuits test is more difficult than in the combinational circuit test. However, algorithms can be used to test any type of sequential circuit regardless of its composition. An important sequential circuit is the finite impulse response (FIR) filters that are widely used in digital signal processing applications. Objective: This paper presented a new design under test (DUT) algorithm for 4-and 8-tap FIR filters. Also, the FIR filter and the proposed DUT algorithm is implemented using field programmable gate arrays (FPGA). Method: The proposed test generation algorithm is implemented in VHDL using Xilinx ISE V14.5 design suite and verified by simulation. The test generation algorithm used FIR filtering redundant faults to obtain a set of target faults for DUT. The fault simulation is used in DUT to assess the benefit of test pattern in fault coverage. Results: The proposed technique provides average reductions of 20 % and 38.8 % in time delay with 57.39 % and 75 % reductions in power consumption and 28.89 % and 28.89 % slices reductions for 4- and 8-tap FIR filter, respectively compared to similar techniques. Conclusions: The results of implementation proved that a high speed and low power consumption design can be achieved. Further, the speed of the proposed architecture is faster than that of existing techniques.

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Performance Analysis of Various Multipliers Using 8T-full Adder with 180nm Technology

Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) ◽

10.2174/2352096513666200107091932 ◽

2020 ◽

Vol 13 (6) ◽

pp. 864-870

Author(s):

Sai Venkatramana Prasada G.S ◽

G. Seshikala ◽

S. Niranjana

Keyword(s):

Low Power ◽

Power Dissipation ◽

High Speed ◽

High Performance ◽

Full Adder ◽

Fundamental Operation ◽

Wallace Tree ◽

Power Delay Product ◽

The Comparative Study ◽

Wallace Tree Multiplier

Background: This paper presents the comparative study of power dissipation, delay and power delay product (PDP) of different full adders and multiplier designs. Methods: Full adder is the fundamental operation for any processors, DSP architectures and VLSI systems. Here ten different full adder structures were analyzed for their best performance using a Mentor Graphics tool with 180nm technology. Results: From the analysis result high performance full adder is extracted for further higher level designs. 8T full adder exhibits high speed, low power delay and low power delay product and hence it is considered to construct four different multiplier designs, such as Array multiplier, Baugh Wooley multiplier, Braun multiplier and Wallace Tree multiplier. These different structures of multipliers were designed using 8T full adder and simulated using Mentor Graphics tool in a constant W/L aspect ratio. Conclusion: From the analysis, it is concluded that Wallace Tree multiplier is the high speed multiplier but dissipates comparatively high power. Baugh Wooley multiplier dissipates less power but exhibits more time delay and low PDP.

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