An NMOS Low Drop-out Voltage Regulator with -17dB Wide-Band Power Supply Rejection for SerDes in 22FDX

A fully on-chip Low Drop Out (LDO) regulator that uses an NMOS output transistor, designed in 22FDX technology, is presented. Proposed LDO capitalizes on technological advantages of back gate bias available in 22FDX to reduce the drop out voltage for regulator and achieve wide band power supply rejection. Charge-pump is used to apply forward back-bias on the NMOS pass device to reduce its threshold voltage down to 0V and enable low drop out regulation. The LDO generates 0.91V output from 1.35V input supply with load current capacity of 15mA. Proposed LDO provides wide band power supply rejection achieving worst case PSR of -17dB across 1Hz-10GHz frequency spectrum essential for SerDes applications. Unity gain bandwidth of >15MHz is achieved along with fast transient response of 63mV peak-to -peak for a current step of 14mA in 100ns.

[1]  Holger Sedlak,et al.  A very low drop voltage regulator using an NMOS output transistor , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[2]  Guillermo J. Serrano,et al.  A 1μA linear regulator with programmable NMOS pass device , 2015, 2015 IEEE Dallas Circuits and Systems Conference (DCAS).

[3]  Jianping Guo,et al.  A 25mA CMOS LDO with −85dB PSRR at 2.5MHz , 2013, 2013 IEEE Asian Solid-State Circuits Conference (A-SSCC).

[4]  T. Karnik,et al.  Area-efficient linear regulator with ultra-fast load regulation , 2005, IEEE Journal of Solid-State Circuits.

[5]  Ka Nang Leung,et al.  25 mA LDO with -63 dB PSRR at 30 MHz for WiMAX , 2010 .

[6]  V. Molata,et al.  Capacitor-less Linear Regulator with NMOS Power Transistor , 2013 .

[7]  Saurabh Kumar Singh,et al.  Ultra-fast Cap-less LDO for Dual Lane USB in 28FDSOI , 2015, 2015 28th International Conference on VLSI Design.

[8]  Stephane Monfray,et al.  UTBB FDSOI: Evolution and opportunities , 2015, 2015 45th European Solid State Device Research Conference (ESSDERC).

[9]  Nitin Bansal,et al.  Any Capacitor Stable LVR Using Sub-unity Gain Positive Feedback Loop in 65nm CMOS , 2015, 2015 28th International Conference on VLSI Design.

[10]  Mark Lundstrom.  ECE 612 Lecture 28: Overview of SOI Technology , 2006 .

[11]  Michel Declercq,et al.  A high-efficiency CMOS voltage doubler , 1998, IEEE J. Solid State Circuits.

[12]  Quan Pan,et al.  A Fully-Integrated Low-Dropout Regulator With Full-Spectrum Power Supply Rejection , 2015, IEEE Transactions on Circuits and Systems I: Regular Papers.

[13]  Philip K. T. Mok,et al.  Wide-Loading-Range Fully Integrated LDR With a Power-Supply Ripple Injection Filter , 2012, IEEE Transactions on Circuits and Systems II: Express Briefs.

[14]  Wolfgang Pribyl,et al.  Capacitor-less LVR for a 32-bit automotive microcontroller SoC in 65nm CMOS , 2012, 2012 Proceedings of the ESSCIRC (ESSCIRC).

[15]  Ping Gui,et al.  An NMOS low dropout voltage regulator with switched floating capacitor gate overdrive , 2009, 2009 52nd IEEE International Midwest Symposium on Circuits and Systems.

[16]  José Silva-Martínez,et al.  External Capacitor-Less Low Drop-Out Regulator With 25 dB Superior Power Supply Rejection in the 0.4–4 MHz Range , 2014, IEEE Journal of Solid-State Circuits.

[17]  Philippe Flatresse,et al.  UTBB FD-SOI: A process/design symbiosis for breakthrough energy-efficiency , 2013, 2013 Design, Automation & Test in Europe Conference & Exhibition (DATE).