关键词: 路由查找, LDO, 电源产生, 电压检测

Abstract: An on-chip power generation circuit for a network processing chip is designed. It includes a high-precision bandgap reference circuit, a buffer driver circuit, 4 fast response low dropout regulator (LDO) circuits and an abnormal detection circuit. It powers the memory, search engine algorithm core, clock management and control logic independently by 4 LDOs, which improves the stability of power for each circuit module. When the circuit is abnormal, an error signal is generated by the abnormal detection circuit to quickly turn off the power and improve the power reliability of the whole chip. The circuit is realized by 28 nm process. The test results show that the maximum load current provided by the circuit is up to 200 mA, which meets the requirements of network chip systems.

Key words: routing lookup, LDO, power generation, voltage detection