Wideband amplifier circuit of Darlington structure

Abstract

The invention discloses a wideband amplifier circuit of a Darlington structure. The wideband amplifier circuit comprises a first-stage amplification circuit, a second-stage amplification circuit and a phase regulating circuit. The first-stage amplification circuit comprises a first triode, and the base of the first triode is the signal input end of the wideband amplifier circuit. The second-stage amplification circuit comprises a second triode and a third triode. The emitter of the second triode is connected with the collector of the third triode, the base of the second triode is connected with direct-current bias voltages, and the emitter of the third triode is grounded. The emitter of the first triode is connected with the base of the third triode, and the collector of the first triode is connected with the collector of the second triode and serves as the signal output end of the wideband amplifier circuit. The phase regulating circuit is used for adjusting the current phase of the collector of the first-stage amplification circuit. One end of the phase regulating circuit is grounded, and the other end of the phase regulating circuit is connected with the connecting end of the emitter of the first triode and the base of the third triode.

Description

technical field [0001] The invention relates to the technical field of amplifier circuits, in particular to a Darlington-structure broadband amplifier circuit. Background technique [0002] The design of broadband amplifiers has become a hot issue in the field of monolithic microwave integrated circuits (MMICs) in modern electronic warfare. Negative Darlington structures are widely used in the design of broadband amplifier circuits. figure 1 It is a structural schematic diagram of a broadband amplifier circuit of a traditional Darlington structure, wherein a is the input end of the entire circuit, and b is the output end of the entire circuit, because the first-stage amplifying circuit (including Q5) and the second-stage amplifying circuit (including Q6) There is a 180-degree phase difference, so that the current of the output terminal b of the entire circuit is the difference between the collector current of the transistor Q5 and the collector current of the transistor Q6,...

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Problems solved by technology

figure 1 It is a structural schematic diagram of a broadband amplifier circuit of a traditional Darlington structure, wherein a is the input end of the entire circuit, and b is the output end of the entire circuit, because the first-stage amplifying circuit (including Q5) and the second-stage amplifying circuit (including Q6) There is a 180-degree phase difference, so that the current of the output terminal b of the entire circuit is the difference between the collector current of the transistor Q5 and the collector current of the transistor Q6, resulting in a decrease in gain performance, so it is no longer possible to meet the wide bandwidth and high gain of the broadband amplifier. needs, and most of them use GaAs PHEMT process, which is expensive

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