Voltage regulator with variable drive strength for improved...

Details Voltage regulator with variable drive strength for improved... Voltage regulator with variable drive strength for improved...

2008-07-15

2008-07-15

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S314000, C327S539000

Reexamination Certificate

active

07400123

ABSTRACT:
A voltage supply circuit having variable drive strength can optionally be used to provide improved phase margin in an integrated circuit. A bandgap circuit drives an operational amplifier, with the second input of the operational amplifier being a regulated voltage node. The operational amplifier drives multiple pull-ups in a pull-up network coupled to the regulated voltage node, of which the different pull-ups can be separately enabled to control the effective channel width of the pull-up network. In some embodiments, a control circuit (e.g., one or two additional operational amplifiers driving a counter) accepts the output of the operational amplifier as an input signal and provides multiple enable signals to the pull-up network.

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