Output capacitor-free low-dropout regulator with fast transient response and ultra small compensation capacitor

Full On-chip low dropout voltage regulator with an enhanced transient response for low power systems

“…An important enhancement response time is improved at the cost of a large area, which is unsuitable for SoC solutions. In [22] a Slew-rate Enhancement (SRE) circuit was proposed, with a bandwidth less than 50 hertz under full voltage swing, which is not recommended for high frequency system.…”

“…The key features are to guarantee the system stability and eliminate the need of any large passive devices and any off-chip capacitor which is not recommended in the SoC designs as the case presented in [5][6][7] and [23] shows. The solution presented in this work pursues the same objective presented in [20][21][22], which is enhancing the response time with a fast settling-time without deteriorating the gain bandwidth to address the mentioned issue in [20][21][22]. By using a simple fast detector amplifier and small on-chip compensation capacitors, the proposed circuit achieved a low quiescent current and minimum under/over-shoots over the full range of transient load current, therefore, making it suitable for low power applications and presenting a solution of the problems shown in [4,8], while guaranteeing stability under all operating conditions.…”