IJSRP, Volume 3, Issue 3, March 2013 Edition [ISSN 2250-3153]
Suresh R.Rijal , Ms.Sharda G. Mungale
Multiplication is frequently required in digital signal processing. Parallel multipliers provide a high-speed method for multiplication, but require large area for VLSI implementations. In most signal processing applications, a rounded product is desired to avoid growth in word size. Thus an important design goal is to reduce the area requirement of the rounded output multiplier. This paper presents a method for parallel multiplication which computes the products of two n-bit numbers by summing only the most significant columns with a variable correction method. This paper also presents a comparative study of Field Programmable Gate Array (FPGA) implementation of 8X8 standard and truncated multipliers using Very High Speed Integrated Circuit Hardware Description Language (VHDL). Truncated multipliers can be used in finite impulse response (FIR) and discrete cosine transforms (DCT). The truncated multiplier shows much more reduction in device utilization as compared to standard multiplier. Significant reduction in FPGA resources, delay, and power can be achieved using truncated multipliers instead of standard parallel multipliers when the full precision of the standard multiplier is not required.