Patent US 3633120A

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Patent number US 3633120A (click link for details and documents via Google Patents)
Title Amplifier circuit
Inventors Carl Battjes
Company Tektronix Inc
Filing date 1970-09-16
Grant date 1972-01-04

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This patent describes the ft doubler circuit, a transistor amplifier topology that has a current gain of 2 even at the transit frequency of the transistors that are used in the circuit.