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This paper describes design techniques for multigigahertz digital bipolar circuits with supply voltages as low as 1.5 V. Examples include a 2/1 multiplexer operating at 1 Gb/s with 1.2 mW power dissipation, a D-1atch achieving a maximum speed of 2.2 GHz while dissipating 1.4 mW, two exclusive-OR gates with a delay less than 200 ps and power dissipation of 1.3 mW, and a bufferflevel shifter having a delay of 165 ps while dissipating 1.4 mW. The prototypes have been fabricated in a 1.5-#m 12-GHz bipolar technology. Simulations on benchmarks such as frequency dividers and line drivers indicate that, for a 1.5-V supply, the proposed circuits achieve higher speed than their CMOS counterparts designed in a 0.5-um CMOS m-ocess with zero threshold ;oltage,

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