CN210380776U - Lossless negative feedback low-noise amplifier circuit - Google Patents
Lossless negative feedback low-noise amplifier circuit Download PDFInfo
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- CN210380776U CN210380776U CN201921892348.0U CN201921892348U CN210380776U CN 210380776 U CN210380776 U CN 210380776U CN 201921892348 U CN201921892348 U CN 201921892348U CN 210380776 U CN210380776 U CN 210380776U
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Abstract
The utility model discloses a lossless negative feedback low noise amplifier circuit, including the low noise amplifier tube that is used for signal amplification, the negative feedback circuit of connection on the low noise amplifier tube, the balun of negative feedback circuit for being used for impedance transformation, low noise amplifier's power end is connected with static bias circuit. The static bias circuit provides static bias current for the low noise amplifier, so that the power supply of the low noise amplifier is constant in current. By adopting a feedback type structure of a low-noise amplifier tube and a balun, the sensitivity and high linearity of the whole receiver are realized in the front-end circuit of the receiver, the problem that the low-noise amplifier has high requirements among noise coefficient, gain, port impedance, sensitivity and linearity indexes and is not easy to consider is solved, and the performance of the receiver is directly improved.
Description
Technical Field
The utility model relates to a low noise amplifier field, more specifically the utility model relates to a lossless negative feedback low noise amplifier circuit that says so.
Background
Low noise amplifiers, i.e., amplifiers with very low noise figure, are commonly used as high frequency or intermediate frequency preamplifiers for various types of radio receivers and as amplification circuits for high sensitivity electronic detection devices. The existing low noise amplifier has a high noise coefficient, the linearity is not good enough under the same input signal condition, and due to the mutual influence between the noise coefficient and the linearity, the noise coefficient and the high linearity of a receiving channel cannot be simultaneously realized in the practical circuit application of a receiver due to a large input standing wave ratio.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem and provide a lossless negative feedback low noise amplifier circuit.
The utility model discloses a following technical scheme realizes:
a lossless negative feedback low-noise amplifier circuit comprises a low-noise amplifier tube for amplifying signals and a negative feedback circuit connected to the low-noise amplifier tube, wherein the negative feedback circuit is a balun for impedance transformation, and a power supply end of the low-noise amplifier is connected with a static bias circuit. The static bias circuit provides static bias current for the low noise amplifier, so that the power supply of the low noise amplifier is constant in current. The negative feedback circuit of the amplifying tube is realized by adopting the balun, and the input and output impedance and the amplifier gain can be adjusted by adjusting the turn ratio of the primary winding and the secondary winding of the balun. The scheme adopts the feedback type structure of the low-noise amplifier tube and the balun, realizes the sensitivity and high linearity of the whole receiver in the front-end circuit of the receiver, solves the problem that the low-noise amplifier has high requirements among noise coefficient, gain, port impedance and linearity index and is not easy to consider, and directly improves the performance of the receiver.
Preferably, the low noise amplifier tube is a triode ATF531P 8. The ATF531P8 has the characteristics of low noise and high linearity, the noise coefficient is only 0.6dB in the typical static working state of 4V/135Ma and 2GHz, and the performance of the amplifier can be greatly improved by adopting the triode.
Preferably, the static bias circuit comprises a triode, a resistor connected between an emitter of the triode and a power supply, a grounded capacitor connected to a base of the triode, and a diode connected between the power supply and the base of the triode.
Preferably, the balun is guarana balun.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses a sensitivity and the high linearity of complete machine are realized to low noise amplifier tube, balun's feedback formula structure in the receiver front end circuit, have solved the difficult problem that low noise amplifier high requirement is difficult for taking into account between noise figure, gain, port impedance, sensitivity, linearity index, have directly improved the performance of receiver.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
A lossless negative feedback low noise amplifier circuit as shown in fig. 1, which can be applied in a receiver of radar, transmitter, satellite, telephone network, wireless network modem/router. The low-noise amplifier circuit comprises a low-noise amplifier tube and a negative feedback circuit; the low-noise amplifier tube is used as a core device of a circuit of the amplifier, and a low-noise triode is adopted to realize signal amplification; the negative feedback circuit may employ a balun, i.e., a balun, that is matched by providing impedance transformation for the two different lines. The power supply end of the low-noise amplifier is connected with a static bias circuit, and the static bias circuit provides constant current for the low-noise amplifier. The circuit can improve the port impedance for adjusting input and output by changing the winding ratio of the balun, and simultaneously adjusts the influence of the signal feedback size on the gain and the linearity of the amplifier.
Example 2
Based on the principle of the foregoing embodiments, this embodiment discloses a specific implementation manner, that is, as a specific circuit shown in fig. 1, a low noise amplifier tube adopts a transistor ATF531P 8V 301 as a core device for signal amplification. The static bias circuit is composed of a chip BCR400W and comprises a triode, a resistor connected between an emitter of the triode and a power supply, a grounded capacitor connected with a base electrode of the triode and a diode connected between the power supply and the base electrode of the triode, wherein the diode adopts a series structure of two diodes. The balun adopts Guarana balun T304. In fig. 1, C302 and C303 constitute a feedback capacitor, and C301 constitutes an input coupling capacitor; r303 is a feedback balance resistor; the rest resistor capacitors are decoupling capacitors and bias resistors.
The amplifier adopts the balun with a high Q value as a feedback loop, and adjusts the input and output impedance and the amplifier gain by adjusting the turn ratio of the primary winding and the secondary winding, thereby achieving two purposes. The noise coefficient of the working frequency band can be below 1dB, the gain is more than or equal to 20dB, and the output third-order intermodulation is more than or equal to 38 dBm. The circuit has high reliability, components can normally work under severe conditions such as high temperature and low temperature through strict screening and testing, and the achievable main technical indexes comprise:
input-output voltage standing wave ratio: less than or equal to 1.3: 1;
noise coefficient: not more than 1.1dB at high temperature, not more than 0.8dB at normal temperature, and not more than 0.7dB at low temperature;
input signal frequency: 50 MHz-80 MHz;
output P-1：≥17dBm；
Outputting third-order intermodulation: not less than 38dBm
Gain: not less than 20dB
The circuit can be applied to a VHF (very high frequency) ultrashort wave receiver, a 50-80 MHz signal is input externally, and a good effect of low noise and high linearity is achieved after the signal passes through a front-end high-linearity low-noise amplifier.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A lossless negative feedback low-noise amplifier circuit comprises a low-noise amplifier tube for signal amplification and a negative feedback circuit connected to the low-noise amplifier tube, and is characterized in that: the negative feedback circuit is a balun for impedance transformation, and a power supply end of the low-noise amplifier is connected with a static bias circuit.
2. A lossless negative feedback low noise amplifier circuit as claimed in claim 1, wherein the low noise amplifier tube is transistor ATF531P 8.
3. A lossless negative feedback low noise amplifier circuit as claimed in claim 1, wherein the static bias circuit comprises a transistor, a resistor connected between the emitter of the transistor and the power supply, a capacitor connected to ground at the base of the transistor, and a diode connected between the power supply and the base of the transistor.
4. A lossless negative feedback low noise amplifier circuit as claimed in claim 1, wherein the balun is a melon inner balun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921892348.0U CN210380776U (en) | 2019-11-05 | 2019-11-05 | Lossless negative feedback low-noise amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921892348.0U CN210380776U (en) | 2019-11-05 | 2019-11-05 | Lossless negative feedback low-noise amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210380776U true CN210380776U (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201921892348.0U Active CN210380776U (en) | 2019-11-05 | 2019-11-05 | Lossless negative feedback low-noise amplifier circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN210380776U (en) |
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2019
- 2019-11-05 CN CN201921892348.0U patent/CN210380776U/en active Active
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