PROGRAMMABLE GAIN FEEDBACK AMPLIFIER AND METHOD FOR MAINTAINING CONSTANT PHASE

摘要

In an operational amplifier (30), current and thus the gain is varied to allow the operational amplifier to maintain a constant phase margin at different gain settings without having to change the compensation capacitor (C). At low gain settings decent phase margins can be maintained, allowing better settling behaviour. At higher gain settings, the bandwidth of the operational amplifier is maximized while still maintaining the same phase margin.