Multi-stage lower noise amplification device

A low-noise amplifier and low-noise amplifier technology, applied in the field of multi-stage low-noise amplifier devices, can solve the problems of inability to control the output power, inability to adjust the gain, poor selectivity, etc., so as to improve the suppression performance, improve the sensitivity and frequency selectivity Good results

Inactive Publication Date: 2015-01-07
MIANYANG LEIDICHUANG MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing noise floor amplifiers have the following defects: the gain cannot be adjusted, the output power cannot be controlled, the filter band is relatively flat, and the selectivity is poor.

Method used

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  • Multi-stage lower noise amplification device

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Effect test

Embodiment 1

[0015] As shown in Figure 1, the present invention includes an input isolator, a pre-stage low-noise amplifier, a secondary low-noise amplifier, a surface acoustic filter, a three-stage low-noise amplifier, a four-stage low-noise amplifier and an output isolator, and the input The isolator, pre-stage low-noise amplifier, secondary low-noise amplifier, surface acoustic filter and three-stage low-noise amplifier are connected in sequence, and the input signal is input through the input isolator; the four-stage low-noise amplifier and output isolator are connected in sequence, The output isolator outputs the signal, and a high-pass filter, a low-pass filter, a first attenuator and a second attenuator are sequentially connected between the three-stage low-noise amplifier and the four-stage low-noise amplifier.

[0016] First, the input signal passes through the input isolator to achieve good input VSWR performance; then the input signal is then amplified by the pre-stage low-nois...

Embodiment 2

[0018] The preferred specific structure of this embodiment on the basis of Embodiment 1 is as follows: the first attenuator is a digitally controlled attenuator. The gain of the input signal can be adjusted.

[0019] The second attenuator is a sub-controlled attenuator. Realized the control of the output power.

[0020] The pre-stage low-noise amplifier and the second-stage low-noise amplifier are low-noise and high-gain amplifiers. This kind of amplifier can ensure the effect of the pre-stage low-noise amplifier and the second-stage low-noise amplifier, so that the final output signal can reach the best state, thereby improving the sensitivity of the receiver.

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Abstract

The invention discloses a multi-stage lower noise amplification device which comprises an input isolator, a preceding-stage low noise amplifier, a second-stage low noise amplifier, a sound surface filter, a third-stage low noise amplifier, a fourth-stage low noise amplifier and an output isolator. The input isolator, the preceding-stage low noise amplifier, the second-stage low noise amplifier, the sound surface filter and the third-stage low noise amplifier are connected in sequence, and input signals are input through the input isolator. The fourth-stage low noise amplifier and the output isolator are connected in sequence, and the output isolator outputs signals. A high-pass filter, a low-pass filter, a first attenuator and a second attenuator are sequentially connected between the third-stage low noise amplifier and the fourth-stage low noise amplifier. Through the above principle, the multi-stage lower noise amplification device can adjust input signal gains, achieves automatic level control, and has a good selectivity due to a steep filter strip.

Description

technical field [0001] The invention relates to the field of amplifiers, in particular to a multi-stage low-noise amplifier. Background technique [0002] Mobile communication technology is the product of the highly developed and mutual integration of modern communication technology and computer technology. With the wide application of digital information technology, modern communication technology is developing at an unprecedented high speed, and mobile communication is also developing along the direction of multi-access communication. Compared with FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access) has the advantages of large system capacity, flexible configuration, high spectrum utilization rate, soft handover, and good security performance. Based on these advantages, CDMA technology has been widely used. The low-noise amplifier determines the noise figure of the receiver, and is the key part of the ...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03G3/20
Inventor 梁波
Owner MIANYANG LEIDICHUANG MICROELECTRONICS
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