Back to results
US 2019/0171243 A1Published application
Flip voltage follower low dropout regulator
AssigneeQUALCOMM Incorporated
InventorsMahmoud Mohamed Rashad Ibrahim ELHEBEARY, Sameer WADHWA
Life of this patent
Estimating the term…
Abstract
A wide-tuning range low output impedance flip voltage follower (FVF) low dropout regulator (LDO) for large capacitor switching loads is disclosed. In some implementations, a touch sensing controller driver includes the LDO, which has an operational amplifier and a FVF. The FVF can have a gain device, a source follower device, and an adaptive level shifter coupled between a drain of the source follower device and a gate of the gain device.
Claims19
A touch sensing controller driver, comprising:
- a plurality of switches, each of the plurality of switches configured to couple to a signal line of a touch panel;
- a signal driver having an upper low dropout regulator (LDO) and a lower LDO, the upper LDO coupled to the plurality of switches to supply current to the plurality of switches, the lower LDO coupled to the plurality of switches to sink current from the plurality of switches, wherein the lower LDO comprises
- a lower operational amplifier having an output, a positive input, and a negative input;
- and
- a lower flip voltage follower (FVF) having a lower gain device, a lower source follower device, and a lower adaptive level shifter coupled between a drain of the lower source follower device and a gate of the lower gain device.
2 more elements
An electronic system, comprising:
- a touch sensing panel;
- and
- a touch sensing controller driver coupled to the touch sensing panel, the touch sensing controller driver comprising
- a plurality of switches, each of the plurality of switches configured to couple to a signal line of a touch panel;
- a signal driver having an upper low dropout regulator (LDO) and a lower LDO, the upper LDO coupled to the plurality of switches to supply current to the plurality of switches, the lower LDO coupled to the plurality of switches to sink current from the plurality of switches, wherein the lower LDO comprises
- a lower operational amplifier having an output, a positive input, and a negative input;
- and
- a lower flip voltage follower (FVF) having a lower gain device, a lower source follower device, and a lower adaptive level shifter coupled between a drain of the lower source follower device and a gate of the lower gain device.
5 more elements
Dependencies are inferred from the claim text.