Variable gain low-noise amplifier
A low-gain amplifier technology, which is applied in the direction of improving the amplifier to reduce the impact of noise, can solve the problems of wireless receiving electronic product applications that cannot be low-power consumption, high power consumption of the amplifier, and complex structure, etc., to achieve simple structure, easy bandwidth, small size effect
Active Publication Date: 2015-06-10
科山芯创(福建)科技有限公司
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Problems solved by technology
[0003] figure 1 It is a circuit diagram of a traditional variable gain amplifier, which uses an operational amplifier as the core of the circuit, and changes the gain by adjusting the values of resistors R11 and R12. However, because wireless receivers generally require the gain of the internal variable gain amplifier to The control voltage of the amplifier has a "decibel-linear" relationship, so the amplifier needs to use a slope voltage generator with a complex structure, large size and high power consumption to generate the control voltage needed to adjust the gain, which will cause the amplifier The overall power consumption is higher,
[0004] It can be seen from the above that the existing traditional variable gain amplifier requires a slope voltage generator with a complex structure, large size and high power consumption to adjust the gain, and cannot be used in low-power wireless receiving electronic products. Therefore, there is an urgent need for a variable gain amplifier that can be applied to low-power wireless receiving electronic products
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[0042] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0043] figure 2 A schematic structural diagram of a variable-gain low-noise amplifier provided in an embodiment of the present application;
[0044] Such as figure 2 As shown, the variable gain low noise amplifier includes: an amplifying circuit 100 and a control circuit 200, the input terminal of the amplifying circuit 100 inputs a v...
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The invention discloses a variable gain low-noise amplifier which comprises an amplifying circuit and a control circuit, wherein the amplifying circuit comprises a first input load, a first transconductance input sub-circuit and a first output load; and the control circuit comprises a second input load, a second transconductance input sub-circuit, a second transconductance output sub-circuit and a second output load. According to the variable gain low-noise amplifier, a transconductance circuit serves as the input part of the amplifying circuit, an input voltage signal is converted into the current and transmitted to the first output load to be output; a group of control signals are generated via the control circuit, and the resistance of the first input value and the resistance of the first output load in the amplifying circuit are controlled, thus, the gain of the amplifying circuit can be adjusted. The amplifying circuit and the control circuit are both simple in structure, so the variable gain low-noise amplifier is low in power consumption, and can be applied to low-cost and low-power consumption wireless receiving electronic products.
Description
technical field [0001] The present application relates to the technical field of amplifiers, in particular to a variable-gain low-noise amplifier. Background technique [0002] With the development of society, the application of low-power radio frequency technology is becoming more and more extensive, such as bus cards used by buses, wireless routers that can surf the Internet anywhere, wireless keyboards or mice, and so on. Low Noise Amplifier (LNA for short) is a key module of RF front-end of various wireless receivers, its performance plays a decisive role in the whole system. Gain, so as to suppress the noise of subsequent modules such as mixers. [0003] figure 1 It is a circuit diagram of a traditional variable gain amplifier, which uses an operational amplifier as the core of the circuit, and changes the gain by adjusting the values of resistors R11 and R12. However, because wireless receivers generally require the gain of the internal variable gain amplifier to ...
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IPC IPC(8): H03F1/26
Inventor 李晓波孙礼中
Owner 科山芯创(福建)科技有限公司