GTL: a low-swing solution for high-speed digital logic

Today´s high-speed backplane and point-to-point applications require devices that can provide high performance, excellent signal integrity and cost effectiveness. GTL (Gunning transceiver logic) and BTL (backplane transceiver logic) transceivers were designed to meet these characteristics. Both transceiver families show similar skew, slew rate and SSN performance. BTL is generally used for heavily-loaded backplanes (100 mA) and for frequencies less than 75 MHz. However, the lab data presented in this paper show that GTL is more suitable for designs that require high performance (up to 100 MHz for the current family and 200 MHz for the future generation) and low power consumption at low cost and minimum board space