High speed current amplifier buffer circuit
AssigneeNational Semiconductor Corporation
InventorsDennis M. Monticelli, John W. Wright
Life of this patent
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Abstract
A high speed buffer circuit is composed of complementary symmetry emitter follower driver and output stages. The input of driver stage includes active load devices cross-coupled to the output stage inputs so that the output stage is bootstrap driven from emitter followers. The circuit is biased by level shifting means to operate as a class AB current amplifier. It displays a wide bandwidth along with a high slew rate and can source or sink a large pulsed current.
Claims7
A buffer amplifier circuit having input and output terminals and connectable between the positive and negative rails of an operating power supply, said circuit comprising:
- a pair of complementary emitter follower output transistors having their outputs commonly coupled to said circuit output terminal and having their inputs driven in the same phase;
- a pair of complementary emitter follower input transistors having their inputs commonly coupled to said circuit input terminal and their outputs coupled to drive the inputs of said pair of complementary emitter follower output transistors, said input transistors being arranged to be complementarily connected to said output transistors;
- and
- a pair of complementary bootstrap load transistors connected to said input transistors and having inputs cross-coupled to be driven from the inputs of said output transistors. sistors.
Dependencies are inferred from the claim text.