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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

AI Technical Summary

Problems solved by technology

Therefore, the application range of traditional broadband amplifiers is limited and cannot meet the gain requirements for band frequencies between 500MHz and 1000MHz

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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