High bandwidth, high PSRR, low dropout voltage regulator
3 Assignments
0 Petitions
Accused Products
Abstract
A voltage regulator may include one or more features for generating high PSRR. For example, source follower devices may be included in the voltage regulator for providing current sources for the output voltage nodes. The source followers may be sensitive to power supply noise at the gate terminal. Filters are included on the gate terminals to filter the power supply noise, thus reducing the noise at the gate terminals. As another example, the voltage regulator may employ current sources on the output voltage nodes which produce current inversely proportional to the current drawn by the load. In one embodiment, the voltage regulator may include a power control circuit used to provide overvoltage protection during power up. The power control circuit provides a voltage during power up, and ceases providing the voltage after a time interval so that the circuit may operate.
-
Citations
18 Claims
-
1-15. -15. (canceled)
-
16. A circuit comprising:
-
an operational amplifier (op amp);
a first transistor having a gate terminal coupled to an output of the op amp and having a first terminal and a second terminal, the first terminal being an output to which a load is couplable, the load being capable of drawing a variable current from the first terminal during operation; and
a first current source coupled to the first terminal, the first current source drawing a first current from the first terminal which is inversely proportional to the current drawn by the load during operation. - View Dependent Claims (17, 18)
-
Specification