High-linearity wide-band amplifier
A high linearity, amplifier technology, applied in the direction of improving the amplifier to reduce nonlinear distortion, etc., can solve the problems of increasing the cost of integrated circuits, unable to achieve external adjustment, etc., to achieve the effect of reducing application cost and improving linearity
Active Publication Date: 2016-06-08
BEIJING ZHONGDIAN HONGYE TECH CO LTD
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Problems solved by technology
[0003] This manual adjustment method requires the amplifier integrated circuit to have redundant pins for the peripheral control circuit, which will not only increase the cost of the integrated circuit package, but also require the configuration of an external control circuit, which is the current trend of seeking low-cost applications is often unacceptable
In fact, if the integrated circuit in SOT89 or other similar packages has only three pins (input, output and ground), this method of external adjustment cannot be realized at all.
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[0017] Below in conjunction with accompanying drawing, describe in detail the specific implementation of the high linearity broadband amplifier of the present invention:
[0018] Such as figure 2 As shown, a high-linearity broadband amplifier described in the present invention includes: a common-emitter amplifier circuit 103 composed of a single NPN transistor Q1, a bias circuit 104 that provides a bias voltage for the transistor Q1, and a common-emitter amplifier. Type amplifying circuit 103 input, the output terminal is the static feedback resistor R between the base and the collector of the transistor Q1 as the static feedback circuit 102 F , and the dynamic feedback circuit 101 between the input and output ends of the common-emitter amplifier circuit 103, that is, the base and the collector of the transistor Q1, the specific structure of the dynamic feedback circuit 101 includes: NPN type dynamic adjustment transistor Q2, A pair of bias resistors is the upper bias resist...
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The invention discloses a high-linearity wide-band amplifier capable of maintaining ideal gain and linearity within a large input signal range. The high-linearity wide-band amplifier comprises a common-emitter amplifying circuit, a biasing circuit connected with the input end of the common-emitter amplifying circuit, a static feedback circuit arranged between the input end and the output end of the common-emitter amplifying circuit, and a dynamic feedback circuit arranged between the input end and the output end of the common-emitter amplifying circuit. The feedback resistance value between the input end and the output end of the common-emitter amplifying circuit can be dynamically adjusted through the dynamic feedback circuit according to the amplitude of input signals. The high-linearity wide-band amplifier is especially suitable for the transmission process of a cable television (CATV) and radio frequency driving of fiber to the home.
Description
technical field [0001] The invention relates to an amplifier, in particular to a broadband amplifier with relatively large input signal power. Background technique [0002] Such as figure 1 In the traditional amplifier circuit shown, in order to achieve a larger bandwidth, a feedback resistor R is usually introduced between the input and output F . However, in many applications, such as cable television (CATV) signal transmission or fiber-to-the-home RF drive, due to the large power range of the input signal, sometimes even a dynamic range of tens of dBm, the amplifier is easy to operate in large Saturation of the input signal affects the linearity specification of the output signal. In order to improve the linearity of the amplifier, the usual method is to introduce a negative feedback resistor R at the emitter of the amplifier. E to improve the linearity of the amplifier, however, the introduction of the negative feedback resistor R E It has a negative effect, namely:...
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IPC IPC(8): H03F1/32
CPCH03F1/32
Inventor 曹然
Owner BEIJING ZHONGDIAN HONGYE TECH CO LTD