关键词: 带隙基准电压源, 输出失调存储, 工艺补偿

Abstract: Stable on-chip power supply is critical for high speed optical receivers.Therefore,power management unit(PMU)is designed to generate multiple stable power supplies for blocks.Bandgap voltage reference with low temperature coefficient(TC)is the key block for PMU.A voltage reference with low temperature coefficient for high speed optical receivers is proposed in the paper.In order to eliminate derivation caused by random offset,output offset storage(OSS)technique is adopted in this paper.The output offset voltage is sampled and held by S/H circuit,and offset current is then generated to compensate the output offset current of the main amplifier.Consequently,the offset voltage is canceled under variable PVT conditions.The voltage reference proposed in the paper is designed and fabricated by 0.18 μm CMOS process.Simulation results show that the input offset voltage can be reduced from 7 mV to 0.1 mV.Mass production results show that the maximum TCis20.5×10-6/℃,with88μV ripple voltage,which is suitable for high speed optical receiver.

Key words: bandgap reference, output offset voltage storage, process compensation