Hierarchical current amplifier

Details Hierarchical current amplifier Hierarchical current amplifier

1989-07-25

1990-03-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323315, H03F 304

Patent

active

049104802

ABSTRACT:
A hierarchical current amplifier includes a first current mirror tier including a current mirror having an input coupled to an amplifier base terminal for receiving an input current, an output coupled to an amplifier collector terminal, and a pair of emitter terminals. A second current mirror tier includes two current mirrors corresponding to each emitter terminal in the first current mirror tier, each current mirror having an input coupled to one of the emitter terminals of the current mirror in the first current mirror tier. The two current outputs in the second tier are coupled to the amplifier collector terminal to provide current gain. Successive tiers of current mirrors may be added to provide more current gain. Each successive tier includes a current mirror corresponding to each emitter terminal in the previous current mirror tier, each current mirror having an input coupled to one of the emitter terminals of the previous current mirror tier, an output coupled to the amplifier collector terminal, and a pair of emitter terminals with the emitter terminals in the last tier being coupled to the amplifier emitter terminal.

REFERENCES:
patent: 4647870 (1987-03-01), Ishii

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