Miller loop compensation network with capacitive drive

Details Miller loop compensation network with capacitive drive Miller loop compensation network with capacitive drive

1992-04-27

1993-04-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330107, H03F 134

Patent

active

052046397

ABSTRACT:
A monolithic operational amplifier (10) having an Miller loop compensation network (13) with improved capacitive drive. The monolithic operational amplifier (10) has an input stage (11), an output stage (12), and a compensation network (13). The compensation network (13) provides negative feedback between an output node (19) of the output stage (12) and an input node (16) of the output stage (12). The compensation network (13) has a compensation capacitor (26), a resistor (27), an isolation resistor (33), a shunt capacitor (28), and an isolation transistor (25). The compensation network (13) creates a dominant pole, a zero and a nondominant pole having a higher frequency than the zero. The nondominant pole improves a gain margin while preserving sufficient phase margin. The isolation transistor (25) provides improved capacitive drive.

REFERENCES:
patent: 2857462 (1958-10-01), Lin

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