Broadband amplifier

An amplifier and broadband technology, applied in the field of broadband amplifiers, can solve the problems of limited application range and inability to meet the requirements of band-frequency gain, and achieve the effect of expanding application occasions

Inactive Publication Date: 2014-10-29
SUZHOU RONGXIN MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the application range of traditional broadband amplifiers is limited an

Method used

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, describe in detail the specific implementation of the broadband amplifier that can realize positive gain level described in the present invention:

[0025] Such as Figure 5 As shown, the broadband amplifier of the present invention includes: a self-bias circuit 103, an internal feedback circuit 104, an external feedback circuit 102, and a multi-stage current amplifying circuit 101 with a Darlington transistor structure for two-stage current amplification. The specific structure of the multi-stage current amplifying circuit 101 includes: a first-stage current amplifying circuit, that is, a primary current amplifying circuit, and a second-stage current amplifying circuit, that is, a final-stage current amplifying circuit. The first-stage current amplifying circuit includes: an emitter-following primary The amplifying transistor Q2, the emitter of the primary amplifying transistor Q2 is grounded through the primary bias curr...

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Abstract

The invention discloses a broadband amplifier of which the gain reduction is smaller than 0.5 dB within the band frequency ranging from 500 MHz to 1000 MHz. The broadband amplifier comprises a self-biasing circuit, an inner feedback circuit, an outer feedback circuit and a multi-stage current amplifying circuit, wherein the self-biasing circuit is a mirror current circuit of a last-stage current circuit of the multi-stage current amplifying circuit and determines the lower limit of the operating frequency of the broadband amplifier, the inner feedback circuit dynamically changes the bias voltage provided for a first-stage current amplifying circuit of the multi-stage current amplifying circuit according to the feedback voltage of an output end of the broadband amplifier, namely an output end of the multi-stage current amplifying circuit and the feedback voltage of an output end of the self-biasing circuit, and the outer feedback circuit feeds the changes of the output end of the multi-stage current amplifying circuit to an input end of the broadband amplifier, namely an input end of the multi-stage current amplifying circuit. The broadband amplifier is particularly suitable for the emitting and transmitting process of a cable television (CATV).

Description

technical field [0001] The invention relates to a circuit structure, in particular to a pure hardware current amplifying circuit, and in particular to a broadband amplifier. Background technique [0002] Everyone in the industry knows that a Broadband Amplifier (Broadband Amplifier) ​​is used in CATV signal transmission and transmission applications. Commonly referred to as a broadband amplifier, its operating frequency band is usually in the range of 50MHz to 1000MHz. In existing broadband amplifiers, a Darlington transistor structure (Darlington pair) is usually used. Such as figure 1 As shown, the traditional Darlington transistor structure includes: a primary amplifier transistor Q1 and a common-emitter transistor Q2 as a drive transistor or an emitter follower transistor, and a resistor R2 as a feedback is used to improve the bandwidth, and the resistor R2 It also forms a voltage divider circuit with R1 to set the base bias voltage of the primary amplifier transistor...

Claims

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Application Information

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IPC IPC(8): H03F3/20H03G3/20
Inventor 曹然
Owner SUZHOU RONGXIN MICROELECTRONICS CO LTD
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