Low Noise Amplifier with Envelope Detection
A low-noise amplifier, envelope detection technology, applied in the direction of improving amplifiers to reduce noise effects, etc., can solve problems such as being unsuitable for long-distance wireless applications, and achieve the effect of suppressing in-band interference, low power consumption, and small noise figure
Active Publication Date: 2022-04-12
FUDAN UNIV
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However, these nonlinear suppressors need to trade off their noise performance and dynamic range, so they are not suitable for long-distance wireless applications
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[0019] The invention is described more fully hereinafter in reference to the examples illustrated in the illustrations, providing preferred embodiments but should not be considered limited to the embodiments set forth herein.
[0020] figure 1 shows the interference suppression principle comparison between this LNA with envelope detection function and the traditional inverter-based LNA, the input effective signal V SIG and interfere with V INT Assuming a sine wave, obviously, in the left figure, the traditional inverter-based low-noise amplifier will be saturated when the interference is strong, and the signal is cut off by the power supply voltage, losing effective information. In the figure on the right, the low noise amplifier with envelope detection function introduces the envelope detection branch, he can input signal V IN The envelope is extracted before being amplified. The envelope detection path is composed of an envelope detector, a voltage multiplier and a mirror...
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The invention belongs to the technical field of integrated circuits, in particular to a low noise amplifier with envelope detection function. The low noise amplifier with envelope detection function adds an envelope detection branch on the basis of the low noise amplifier, which can extract the envelope before the input signal is amplified, change the input bias voltage, thereby suppressing the in-band interference, While maintaining a small noise figure and low power consumption, it is suitable for long-distance wireless applications. The LNA can also be cascaded to further increase the signal-to-interference ratio. In order to reduce the non-constant envelope disturbance caused by PVT variation, an envelope feedback loop is also proposed, which can automatically calibrate the output envelope. This low-noise amplifier with envelope detection function takes into account two important indicators of voltage dynamic range and noise performance at the same time, and provides a prerequisite for the coexistence of multiple networks in wireless network applications.
Description
technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a low-noise amplifier with envelope detection function. Background technique [0002] With the development of the Internet of Things, the available industrial scientific medical (ISM) bandwidth, such as the 2.4GHz frequency band, is becoming more and more crowded, so wireless networks are facing the challenge of multi-network coexistence. In order to get a stable wireless connection, the relevant receiver must not only be able to block out-of-band interference, but also be able to suppress high-intensity in-band interference that cannot be filtered out by the front-end acoustic surface / body surface period. However, in order to prolong battery life, State-of-the-art applications use ultra-low supply voltages (≤1V), which are very detrimental to preventing in-band interference. [0003] In order to improve interference and keep low power consumption, some l...
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IPC IPC(8): H03F1/26
CPCH03F1/26
Inventor 叶大蔚史传进张怡云
Owner FUDAN UNIV