Common-emitter common-base amplification circuit for improving phase characteristics and signal processing system

An amplifying circuit and cascode technology, applied in the direction of improving amplifiers to expand bandwidth, improving amplifiers to increase efficiency, and improving amplifiers to reduce the harmful effects of internal resistance, to achieve high input, high input-output isolation, wideband wide effect

Pending Publication Date: 2020-06-12
RADROCK (SHENZHEN) TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems existing in the existing cascode amplifier circuit, the purpose of the present invention is to provide a situation that can eliminate the parasitic capacitance between the base and the collector as the base voltage changes, thereby improving the amplifier circuit Cascode amplifier circuit with improved phase characteristics of phase characteristics

Method used

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  • Common-emitter common-base amplification circuit for improving phase characteristics and signal processing system
  • Common-emitter common-base amplification circuit for improving phase characteristics and signal processing system
  • Common-emitter common-base amplification circuit for improving phase characteristics and signal processing system

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Embodiment 1

[0030] A cascode amplifier circuit with improved phase characteristics provided by this embodiment, such as figure 2 As shown, it includes a common emitter transistor Q1, a common base transistor Q2 and a capacitor C1, the base of the common emitter transistor Q1 is used as the signal input terminal of the amplifier circuit, the collector of the common emitter transistor Q1 is connected to the emitter of the common base transistor Q2, and the The emitter of the emitter transistor Q1 is grounded; the base of the common-base transistor Q2 is loaded with a control signal, and the collector of the common-base transistor Q2 is used as the signal output end of the amplifying circuit; the first plate of the capacitor C1 is connected to the base of the common-base transistor Q2 pole, the second plate and the emitter of the common-emitter transistor Q1 have a common ground, which is used to ensure that the bias signal of the common-base transistor Q2 is based on the ground of the commo...

Embodiment 2

[0034] A cascode amplifier circuit with improved phase characteristics provided by this embodiment, such as image 3 As shown, it includes a common emitter transistor Q1, a common base transistor Q2 and a capacitor C1, the base of the common emitter transistor Q1 is used as the signal input terminal of the amplifying circuit, the collector of the common emitter transistor Q1 is connected with the emitter of the common base transistor Q2, and the The emitter of the emitter transistor Q1 is grounded; the base of the common-base transistor Q2 is loaded with a control signal, and the collector of the common-base transistor Q2 is used as the signal output end of the amplifying circuit; the first plate of the capacitor C1 is connected to the base of the common-base transistor Q2 pole, the second plate and the emitter of the common-emitter transistor Q1 have a common ground, which is used to ensure that the bias signal of the common-base transistor Q2 is based on the ground of the com...

Embodiment 3

[0038] A cascode amplifier circuit with improved phase characteristics provided by this embodiment, such as Figure 4As shown, it includes all electronic components in a cascode amplifier circuit for improving phase characteristics provided by Embodiment 2, and also includes a capacitor C2. The signal output terminal of the transistor Q3 is connected to the base of the cascode transistor Q1 through the capacitor C2. pole. Capacitor C2 has two functions: one is to cut off the DC signal between the front and rear triodes; the other is to match the impedance between the front and rear triodes, reducing the energy loss caused by mismatch.

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PUM

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Abstract

The invention discloses a common-emitter common-base amplification circuit for improving phase characteristics and a signal processing system. The amplifying circuit comprises a common-emitter triodeQ1, a common-base triode Q2 and a capacitor C1, the base electrode of the common-emitter triode Q1 serves as the signal input end of the amplifying circuit, the collector electrode of the common-emitter triode Q1 is connected with the emitting electrode of the common-base triode Q2, and the emitting electrode of the common-emitter triode Q1 is grounded. A control signal is loaded on the base electrode of the common-base triode Q2, and the collector electrode of the common-base triode Q2 is used as the signal output end of the amplifying circuit; a first polar plate of the capacitor C1 and a base electrode of the common-base triode Q2, and a second polar plate and an emitting electrode of the common-emitting triode Q1 are in common ground; and the capacitor C1 is used for stabilizing the base voltage of the common-base triode Q2 in a radio frequency band. According to the circuit, the condition that the phase characteristic of the amplifier is influenced by the change of parasitic capacitance (Cbc) caused by the change of the base voltage of the common-base triode is eliminated, and the phase characteristic of the amplifying circuit is improved.

Description

technical field [0001] The invention belongs to the field of electronic circuits, in particular to a cascode amplifier circuit and a signal processing system for improving phase characteristics. Background technique [0002] Amplifying circuits, also known as amplifiers, are one of the most widely used electronic circuits and the basic unit circuits that constitute other electronic circuits. The so-called amplification is to amplify the input weak signal (referred to as signal, referring to the changing voltage, current, etc.) Zooming in makes sense. The essence of the amplifying circuit is the control and conversion of energy. According to the difference between the common ends of the input circuit and the output circuit, the amplifying circuit has three basic forms: common emitter amplifying circuit, common collector amplifying circuit and common base amplifying circuit. [0003] At present, the common emitter amplifier circuit is one of the commonly used discharge circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/12H03F1/08H03F1/42H03F1/56H03F1/02
CPCH03F1/12H03F1/08H03F1/42H03F1/565H03F1/0205
Inventor 倪楠雷传球胡自洁曹原倪建兴
Owner RADROCK (SHENZHEN) TECH CO LTD
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