1
Shankar Guhados, Sung En Wang, Feng Pan, Sagar Magia, Jonathan H Huynh: Voltage regulators with improved wake-up response. SanDisk Technologies, Davis Wright Tremaine, April 29, 2014: US08710914 (7 worldwide citation)

Techniques are presented for improving the wake-up response of voltage regulation circuits. A first set of techniques relate to the inputs an op-amp in a regulation circuit. In regulated operation, one input receives feedback from the regulator's output. Instead, during reset, after resetting the op ...


2
Feng Pan, Shankar Guhados: Sigma delta over-sampling charge pump analog-to-digital converter. SanDisk Technologies, Davis Wright Tremaine, October 20, 2015: US09164526 (3 worldwide citation)

Techniques are presented for determining current levels based on the behavior of a charge pump system while driving a load under regulation. While driving the load under regulation, the number of pump clocks during a set interval is counted. This can be compared to a reference that can be obtained, ...


3
Feng Pan, Jun Wang, Shankar Guhados, Bo Lei: Charge pump based over-sampling ADC for current detection. SanDisk Technologies, Stoel Rives, November 7, 2017: US09810723 (1 worldwide citation)

Techniques are presented for determining current levels based on the behavior of a charge pump system while driving a load under regulation. While driving the load under regulation, the number of pump clocks during a set interval is counted. This can be compared to a reference that can be obtained, ...


4
Shankar Guhados, Feng Pan: Compensation scheme to improve the stability of the operational amplifiers. SanDisk Technologies, Davis Wright Tremaine, July 7, 2015: US09075424

A right-half plane (RHP) zero (RHZ) compensation scheme to improve the stability of the operational amplifier. A resistance RZ is implemented by a transistor. This transistor tracks process variations of the transistor drive by the op-amp to achieve better stability without requiring a bandwidth red ...


5
Feng Pan, Shankar Guhados: High speed signaling techniques to improve performance of integrated circuits. SanDisk Technologies, Davis Wright Tremaine, June 2, 2015: US09047933

Techniques are presented to improve the performance, accuracy and power consumption of on-chip voltage biasing and transmission for highly loaded RC networks (such as wordlines or bitlines in NAND or 3D memory arrays) that are otherwise limited by the physics of RC time constant. When transitioning ...