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
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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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