Three-level differential buffer for increasing noise margin in pseudo-differential signalling

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Three-level differential buffer for increasing noise margin in pseudo-differential signalling

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A 5Gbit/s/pin transceiver for high-speed memory interfaces is implemented in a 0.18 µm CMOS process. In general, memory interfaces use single-ended signalling with a reference signal because the chip cost is closely related to the number of pins. However, as the data rate increases, reference voltage noise and simultaneous switching noise reduce voltage and timing margin of receiver input signals. Pseudo-differential signalling (PDS) is used to solve the problems, however a previous receiver using PDS is sensitive to core power noise because the receiver uses three-level signals with reduced noise margin. The three-level differential buffer (TLDB) which is robust to core power noise is proposed and the noise margin of the TLDB outputs is larger than that of outputs of a previous PDS receiver.

Inspec keywords: integrated memory circuits; buffer circuits; CMOS memory circuits; high-speed integrated circuits; transceivers

Other keywords: bit rate 5 Gbit/s; transceiver; size 0.18 mum; single-ended signalling; noise margin; core power noise; three-level differential buffer; CMOS; pseudo-differential signaling; simultaneous switching noise; pseudo-differential signalling; reference voltage noise; high-speed memory interfaces

Subjects: CMOS integrated circuits; Semiconductor storage; Semiconductor integrated circuit design, layout, modelling and testing; Memory circuits

References

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      • Ha, K.-S., Kim, L.-S.: `A 3.2-Gb/s transceiver with a quarter-rate linear phase detector reducing the phase offset', Proc. IEEE ASSCC, November 2008, Fukuoka, Japan, p. 217–220.
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      • K.-S. Ha , L.-S. Kim , S.-J. Bae . A 0.13-µm CMOS 6 Gb/s/pin memory transceiver using pseudo-differential signaling for removing common-mode noise due to SSN. IEEE J. Solid-State Circuits , 11 , 3146 - 3162
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      • S.-J. Bae , K.-I. Park , J.-D. Ihm . An 80 nm 4 Gb/s/pin 32 bit 512 Mb GDDR4 graphics DRAM with low power and low noise data bus inversion. IEEE J. Solid-State Circuits , 1 , 121 - 131
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