A Design of High-Speed 4-2 Compressor for Fast Multiplier (Special Issue on Ultra-High-Speed LSIs)

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概要

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• This paper describes the design of a high-speed 4-2 compressor for fast multipliers. Through the survey of the six kinds of representative conventional 4-2 compressor (RBA1-3 and NBA1-3) in both the redundant binary (RB) and the normal binary (NB) scheme, we extracted two problems that degrades the operating speed. The first is the use of multi-input complex gates and the second is the existence of transmission gates (TG) at the input and/or output stages. To solve these problems, we propose high-speed 4-2 compressors using the RB scheme, which we call the high-speed redundant binary adders (HSRBAs). Six kinds of HSRBAs, HSRBA1-6, were derived by making the Boolean equations suitable for high-speed CMOS circuits. Among them, HSRBA2, HSRBA4 and HSRBA6 have no multi-input complex gate and input/output TG, and perform at a delay time of 0.89 ns which is the fastest of all 4-2 compressors. We investigated the logical relation between HSRBAs and conventional 4-2 compressors by analyzing the Boolean equations for each circuit. This investigation shows that all the conventional redundant binary adders RBA1-3 have the same logic structures as HSRBA2. We also showed the conventional normal binary adders NBA1-3 have the same logic structures as HSRBA1, HSRBA3 and HSRBA5, respectively. This implies all 4-2 compressors can be derived from the same equation regardless of RB or NB. We applied the HSRBA2 to a 54×54-bit multiplier using 0.5-μm CMOS technology. The multiplication time at the supply voltage of 3.3 V was 8.8 ns. This is the fastest 54×54-bit multiplier with 0.5-μm CMOS so far, and 83% of the speed improvement is due to the high speed 4-2 compressor.

• 1996-04-25

著者

• MASHIKO Koichiro

  System LSI Development Center, Mitsubishi Electric Corporation

• HORIBA Yasutaka

  System LSI Development Center, Mitsubishi Electric Corporation

• Horino Y

  Advanced Device Development Dept. Renesas Technology Corp.

• Makino Hiroshi

  Renesas Technology Corporation

• SUZUKI Hiroaki

  System LSI Development Center, Mitsubishi Electric Corporation

• MAKINO Hiroshi

  System LSI Development Center, Mitsubishi Electric Corporation

• NAKASE Yasunobu

  Renesas Technology

• HORIBA Yasutaka

  The authors are with Kita-Itami Works, Mitsubishi Electric Corporation

• Nakase Yasunobu

  The System Lsi Laboratory Mitsubishi Electric Corporation

• Nakase Yasunobu

  System Lsi Development Center Mitsubishi Electric Corporation

• Makino H

  Mitsubishi Electric Corp. Itami‐shi Jpn

• SUMI Tadashi

  the System LSI Laboratory, Mitsubishi Electric Corporation

• MORINAKA Hiroyuki

  System LSI Laboratory, Mitsubishi Electric Corporation

• SHINOHARA Hirofumi

  Headquarters, Mitsubishi Electric Corporation

• SUMI Tadashi

  System LSI Laboratory, Mitsubishi Electric Corporation

• Horiba Yasutaka

  Lsi Laboratory Mitsubishi Electric Corporation

• Horiba Yasutaka

  The Authors Are With Kita-itami Works Mitsubishi Electric Corporation

• Horiba Yasutaka

  System Lsi Laboratory Mitsubishi Electric Corporation

• Mashiko Koichiro

  The Ulsi Development Center Mitsubishi Electric Corporation

• Mashiko Koichiro

  System Lsi Development Center Mitsubishi Electric Corporation

• Mashiko Koichiro

  System Lsi Laboratory Mitsubishi Electric Corporation

• Shinohara Hirofumi

  Headquarters Mitsubishi Electric Corporation

• Suzuki H

  Ntt Photonics Labs. Ntt Corporation

• Sumi T

  The Authors Are With Electronics Research Laboratory Matsushita Electronics Corporation

• Sumi T

  Department Of Obstetrics And Gynecology Osaka City University Medical School

• Suzuki H

  Hiroshima Univ. Higashi‐hiroshima‐shi Jpn

• Suzuki Hiroaki

  System Lsi Development Center Mitsubishi Electric Co.

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