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基于Widlar基准与Kuijk基准相结合的思想,独创性地提出了一种双环路控制的带隙基准源,加快了负载瞬态响应的速度,将负载瞬态响应时间有效控制在3μs之内。为了减小功耗及简化零极点补偿网络,设计了一种单级高增益运放,并引入一种新的频率补偿方式,保证了基准环路的稳定性。为了克服Widlar基准固有的PSRR较低的缺点,设计了一种电压预调整结构,电源抑制比分别达到-92.5dB@DC,-61dB@1 MHz。
Based on the idea of Widlar benchmark and Kuijk benchmark, a double-loop controlled bandgap reference source is proposed to speed up the load transient response and effectively control the load transient response time within 3μs. In order to reduce power consumption and simplify the pole-zero compensation network, a single-stage high-gain operational amplifier is designed and a new frequency compensation method is introduced to ensure the stability of the reference loop. In order to overcome the low PSRR inherent in the Widlar reference, a voltage preconditioning structure has been designed with a power supply rejection ratio of -92.5 dB @ DC and -61 dB @ 1 MHz, respectively.