Huffman Encoding using VLSI

Huffman coding is entropy encoding algorithm used for lossless data compression. It basically uses variable length coding which is done using binary tree method. In our implementation of Huffman encoder, more frequent input data is encoded with less number of binary bits than the data with less frequency.This way of coding is used in JPEG and MPEG for image compression. Huffman coding uses a specific method for choosing the representation for each symbol, resulting in a prefix code. Prefix-free codes means the bit string representing some particular symbol is never a prefix of the bit string representing any other symbol

Low-Power High-Speed Double Gate 1-bit Full Adder Cell

In this paper, we proposed an efficient full adder circuit using 16 transistors. The proposed high-speed adder circuit able to operate at very low voltage and maintain the proper output voltage swing and also balanced the power consumption and speed. Proposed design is based on CMOS mixed threshold voltage logic (MTVL) and implemented in 180nm CMOS technology). In the proposed technique the most time-consuming and power consuming XOR gates and multiplexor are designed using MTVL scheme. The maximum average power consumed by the proposed circuit is 6.94µW at 1.8V supply voltage and frequency of 500 MHz, which is less than other conventional methods. Power, delay, and area are optimized by using pass transistor logic and verified using SPICE simulation tool at desired broad frequency range. It is also observed that the proposed designs successfully utilized in many cases, especially whenever the lowest power consumption and delay are aimed