Active biasing control for class-ab cmos operational amplifiers

Details Active biasing control for class-ab cmos operational amplifiers Active biasing control for class-ab cmos operational amplifiers

H - Electricity

03

F

H03F 1/00 (2006.01) H03F 1/30 (2006.01) H03F 3/30 (2006.01) H03F 3/45 (2006.01)

Patent

CA 2119357

2119357 9306655 PCTABS00021 Biasing circuit for a class-AB Miller CMOS operational amplifier generating a first biasing voltage (VB1) for a MOS transistor (M5) determining the current through an operational amplifier input stage (M1....M5), as well as a second biasing voltage (VB1C) for a MOS-transistor (M8) determining the current in a source follower stage (M8, M9), among others comprising a series connection of a MOS transistor (MB1) connected as a diode and a current source (Iref), the junction point being connected to the inverting input of a biasing operational amplifier (A), the non-inverting input of which receives a signal from the junction point from a series connection of two MOS transistors (M8C, M9C) being proportional to the source follower stage (M8, M9). The output of the biasing operational amplifier (A) is connected to the gate electrode of MOS transistor (M8C). The inverting input also receives the first biasing voltage (VB1), whereas the output of the biasing operational amplifier provides the second biasing voltage (VB1C).

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