Design of a 1.9 GHz low-power LFSR circuit using the Reed-Solomon algorithm for Pseudo-Random Test Pattern Generation

A linear feedback shift register (LFSR) has been frequently used in the Built-in Self-Test (BIST) designs for the pseudo-random test pattern generation. The volume of the test patterns and test power dissipation are the key features in the large complex designs. The objective of this paper is to propose a new LFSR circuit based on the proposed Reed-Solomon (RS) algorithm. The RS algorithm is created by considering the factors of the maximum length test pattern with a minimum distance over the time. Also, it has achieved an effective generation of test patterns over a stage of complexity order O (m log2 m), where m denotes the total number of message bits. We analyzed our RS LFSR mathematically using the feedback polynomial function for an area-sensitive design. However, the bit-wise stages of the proposed RS LFSR are simulated using the TSMC 130 nm IC design tool in the Mentor Graphics platform. Experimental results showed that the proposed LFSR achieved the effective pseudo-random test patterns with a low-test power dissipation (25.13 µW). Ultimately, the circuit has operated in the highest operating frequency (1.9 GHz) environment.   &nbsp

LOW POWER AND IMPROVED SPEED 1T DRAM USING DYNAMIC LOGIC

The new trend of the DRAM design is to characterize by its reliability, delay, low power dissipation, and area. This paper dealt with the design of 1-bit DRAM and efficient implementation of a sense amplifier. The proposed 1-bit DRAM designed using dynamic logic design. The proposed circuit consists of buffers, 1 transistor, and capacitor. The circuit is schematized by DSCH2 and layout designs are generated by Microwind CAD tool. The designed and proposed circuits are considered bypass logic and Boolean reduction technique that reduced number of transistors per designed cell logic. The circuits are simulated in various feature sizes namely CMOS 70 nm, CMOS 90 nm, CMOS 120nm and corresponding voltages 0.7 V, 1 V, 1.2 V respectively. Our proposed dynamic logic DRAM circuit has compared with the designed circuit and other existing circuits. Our proposed and designed circuit gives better results in terms of power dissipation, speed, and Area. (R-2) The projected 1-bit DRAM has an outcome and achieved low power 0.229 µW, the area of 22×13µm, the propagation delay of 21 ps and a speed of 0.17 GHz

IMPROVED SPEED LOW POWER AND LOW VOLTAGE SRAM DESIGN FOR LDPC APPLICATION CIRCUITS

The design of SRAM has evolved to suffice the need of the industry in terms of speed, power dissipation and other parameters. This paper proposed a SRAM design and an attempt has been made to design circuits using dynamic logic and pass transistor logic to obtain better performance in terms of speed, power dissipation and throughput. The dynamic logic would maintain voltage degradation by using the PMOS and NMOS transistor just as the CMOS logic, even though the design cell uses majority NMOS transistors. The proposed circuits are simulated using BSIM for different CMOS feature sizes of 70 nm, 90 nm, 120 nm and 180 nm. The results obtained have been analysed and shows that the proposed circuit of 8T performs much better as compared to other circuit configurations. There is significant improvement in power dissipation by 99.64 %, delay by 99.9 %, throughput of 490 Mbps and power delay product of 99.96 %

Circuits Research; New findings in circuits research described from Multimedia University

Due to increased density of transistors in integrated circuits and higher frequencies of operation, power consumption, propagation delay, PDP, and area is reaching the lower limits, scientists in Melaka, Malaysia report

Design of 32-Bit Arithmetic Logic Unit Using Shannon Theorem Based Adder Approach

This thesis proposes two new techniques for the design of full adder circuits namely, Mixed-Shannon and Shannon circuits. The Mixed-Shannon adder cell is developed using the MCIT for the sum operation and the Shannon based technique for the carry. In the second technique approach, the full adder circuit is designed completely by using the Shannon theorem. The Mixed-Shannon and full Shannon adder cells are used in the implementation of 8-bit array multipliers, namely, the Braun array, CSM and Baugh-Wooley multipliers. Output parameters such as propagation delay, total chip area, and power dissipation are calculated from the simulation results

Design of a low-power, high performance, 8×8bit multiplier using a Shannon-based adder cell

In this paper, we have developed a new full-adder cell using multiplexing control input techniques (MCIT) for the sum operation and the Shannon-based technique to implement the carry. The proposed adder cell is applied to the design of several 8-bit array multipliers, namely a Braun array multiplier, a CSA multiplier, and Baugh-Wooley multipliers. The multiplier circuits are designed using DSCH2 VLSI CAD tools and their layouts are generated by Microwind 3 VLSI CAD tools. The output parameters such as propagation delay, total chip area, and power dissipation are calculated from the simulated results. We have also calculated energy per instruction (EPI), throughput, latency, signal-to-noise ratio (SNR), and the effect of temperature on the drain current by using the generated layout output parameter of a BSIM 4 advanced analyzer. The simulated results of the proposed adder-based multiplier circuit are compared with a cell multiplier that utilizes a MCIT-based adder, a cell multiplier composed of complementary pass transistor logic-based (CPL) adders and those of other published multipliers circuits. From the analysis of these simulated results, it was found that the proposed multiplier circuit gives better performance in terms of power, propagation delay, latency and throughput than other published results. (C) 2007 Elsevier Ltd. All rights reserved

Highly stable Delta-Sigma Modulator for industrial applications

A higher order Delta Sigma Modulator (DSM) is basically an unstable system. The approximate conditions for stability cannot be used for the design of a DSM for industrial applications where risk is involved. The existing second order, single stage, single bit, unity or non unity feedback gain (k), discrete DSM cannot be used for the full range (-k to +k) of an input signal since the DSM becomes unstable when the input signal is above +/- 0.7 k. In the present paper, a second order, single stage, discrete DSM with input signal dependant feedback gain and an input signal dependant DSM operating period is proposed. The proposed DSM can operate with a wide range of input signals without causing instability

Low power and high speed 8x8 bit multiplier using non-clocked Pass Transistor Logic

In this paper we have analyzed an 8-bit multiplier circuit using non clocked pass gate families with help of carry save multiplier (CSA) technique. The multiplier cell of the adder is designed by using pass transistors (n-transistors), p-transistors used as cross-coupled devices. The adder cell is designed by using multiplexing control input techniques. A combination of n- and p-transistors used on the mirror logic and inverters of full adder circuit. These multipliers are useful in the portable battery operated multimedia devices for energy efficient. The 8 bit multiplier circuit has been simulated using microwind3 VLSI layout CAD tool. We have analyzed the power dissipation, propagation delay, PDP and EPI (energy per instruction) and compared our results with other pass transistor logics as well as published results. From the simulated results it was found that the power dissipation and propagation delay are low in our designed non-clocked pass transistor logics. Our multiplier circuit shows a power dissipation improvement of 97.6% from Amir et.al and 46.30%, 23.24% and 0.15% from Rizwan et.al. Our multipliers gives better propagation delay compared to Rizwan et. al that are 89.56%, 88.39% and 88.31

DESIGN OF LOW EPI AND HIGH THROUGHPUT CORDIC CELL TO IMPROVE THE PERFORMANCE OF MOBILE ROBOT

This paper mainly focuses on pass logic based design, which gives an low Energy Per Instruction (EPI) and high throughput COrdinate Rotation Digital Computer (CORDIC) cell for application of robotic exploration. The basic components of CORDIC cell namely register, multiplexer and proposed adder is designed using pass transistor logic (PTL) design. The proposed adder is implemented in bit-parallel iterative CORDIC circuit whereas designed using DSCH2 VLSI CAD tool and their layouts are generated by Microwind 3 VLSI CAD tool. The propagation delay, area and power dissipation are calculated from the simulated results for proposed adder based CORDIC cell. The EPI, throughput and effect of temperature are calculated from generated layout. The output parameter of generated layout is analysed using BSIM4 advanced analyzer. The simulated result of the proposed adder based CORDIC circuit is compared with other adder based CORDIC circuits. From the analysis of these simulated results, it was found that the proposed adder based CORDIC circuit dissipates low power, gives faster response, low EPI and high throughput