CN217935600U - Low-noise high-dynamic zero intermediate frequency receiver - Google Patents
Low-noise high-dynamic zero intermediate frequency receiver Download PDFInfo
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- CN217935600U CN217935600U CN202222907171.5U CN202222907171U CN217935600U CN 217935600 U CN217935600 U CN 217935600U CN 202222907171 U CN202222907171 U CN 202222907171U CN 217935600 U CN217935600 U CN 217935600U
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Abstract
The utility model discloses a zero intermediate frequency receiver of high developments of low noise, including multistage amplifier, multistage variable attenuator, each level among the multistage amplifier and each level among the multistage variable attenuator are adjacent setting in proper order to and including the quadrature mixer, at least one-level variable gain amplifier and the analog-to-digital converter that connect gradually, last one-level variable attenuator is connected with the quadrature mixer among the multistage variable attenuator, can realize increasing dynamic range as far as possible and effectively promote the receiver performance.
Description
Technical Field
The utility model relates to a receiver field, more specifically relates to a zero intermediate frequency receiver of high developments of low noise.
Background
In a wireless receiver system, the noise figure and the dynamic range are two important indicators, which determine the minimum signal and the maximum signal that can be received by the receiver. The minimum signal that the receiver can receive is the receive sensitivity, which depends on the receiver noise figure, the demodulation signal-to-noise ratio, the bandwidth, and the thermal noise, and reducing the noise figure in the case where the demodulation signal-to-noise ratio, the bandwidth, and the thermal noise are all determined increases the receiver sensitivity.
The signal is too small for the receiver to detect; the signal is too large and the receiver may experience saturation overload and lose linear gain capability.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model provides a zero intermediate frequency receiver of high developments of low noise, zero intermediate frequency receiver are the direct frequency conversion of radio frequency signal to the baseband, do not need the receiver through intermediate frequency, can realize increasing dynamic range as far as possible and can effectively promote the receiver performance.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a low noise high dynamic zero intermediate frequency receiver, includes multistage amplifier, multistage variable attenuator, each level in the multistage amplifier and each level in the multistage variable attenuator adjacent setting in proper order to and including quadrature mixer, at least one grade variable gain amplifier and the analog digital converter that connects gradually, last one-level variable attenuator is connected with the quadrature mixer in the multistage variable attenuator, and wherein, the radio frequency signal is inserted to the input of the first amplifier in the multistage amplifier, the output and the input of quadrature mixer of last one-level variable attenuator in the multistage variable attenuator are connected.
As a further aspect of the present invention, the multistage amplifier includes a two-stage amplifier, and is a first-stage amplifier and a second-stage amplifier respectively, the multistage variable attenuator includes a two-stage variable attenuator, and is a first-stage variable attenuator and a second-stage variable attenuator respectively, the first-stage amplifier, the first-stage variable attenuator, the second-stage amplifier and the second-stage variable attenuator are connected in sequence, and the second-stage variable attenuator is connected with the quadrature mixer.
As a further aspect of the present invention, the multistage amplifier includes a tertiary amplifier, and is a first stage amplifier, a second stage amplifier, and a third stage amplifier, respectively, the multistage variable attenuator includes a tertiary variable attenuator, and is a first stage variable attenuator, a second stage variable attenuator, and a third stage variable attenuator, the first stage amplifier, the first stage variable attenuator, the second stage amplifier, the second stage variable attenuator, the third stage amplifier, and the third stage variable attenuator are connected in sequence, and the third stage variable attenuator is connected to the quadrature mixer.
As a further aspect of the present invention, including the two-stage variable gain amplifier, be first order variable gain amplifier and second level variable gain amplifier respectively, first order variable gain amplifier is connected with the second level variable gain amplifier, first order variable gain amplifier and second level variable gain amplifier are located between quadrature mixer and the analog-to-digital converter.
As a further aspect of the present invention, the variable attenuator is a digital step attenuator or a voltage variable attenuator.
The utility model discloses following beneficial effect has: the first-stage amplifier LNA1 and the second-stage amplifier LNA2 both adopt low-noise amplifier designs, and are cascaded, so that the noise coefficient of the receiver can be effectively reduced, and the receiving sensitivity of the receiver is improved; by using a combination of a multi-stage variable attenuator and a variable gain amplifier, saturation of any one amplifier in the chain up to a maximum signal input can be avoided for maximum performance of the receiver.
To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a low-noise high-dynamic zero intermediate frequency receiver according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a low-noise high-dynamic zero intermediate frequency receiver according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a low-noise high-dynamic zero intermediate frequency receiver according to embodiment 3 of the present invention.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings and the accompanying knowledge, in which some, but not all embodiments of the invention are shown.
Example 1
Referring to fig. 1, a low-noise high-dynamic zero intermediate frequency receiver includes a first-stage amplifier LNA1, a first-stage variable attenuator ATT1, a second-stage amplifier LNA2, a second-stage variable attenuator ATT2, a quadrature Mixer, a variable gain amplifier VGA, and an analog-to-digital converter ADC, which are connected in sequence; the requirement of the receiver for large dynamic receiving is met by using the variable attenuator and the variable gain amplifier, and meanwhile, two stages of low noise amplifiers are cascaded to ensure a smaller noise coefficient of the receiver;
the radio frequency signal enters the receiver, sequentially passes through a first-stage amplifier LNA1, a first-stage variable attenuator ATT1, a second-stage amplifier LNA2 and a second-stage variable attenuator ATT2, enters a quadrature Mixer Mixer, and is mixed with a local oscillator signal LO provided by a local oscillator in the quadrature Mixer, so that a baseband signal is formed and enters a variable gain amplifier VGA until reaching an analog-digital converter ADC. In this embodiment, the variable attenuator may be a variable attenuator of a model HMC802LP3E, but is not limited to this model; the variable gain amplifier may be a type ADRF6520 variable gain amplifier, but is not limited thereto.
In the embodiment, the first-stage amplifier LNA1 and the first-stage amplifier LNA2 both adopt a low noise amplifier design, and are cascaded, so that the noise coefficient of the receiver can be effectively reduced, and the receiving sensitivity of the receiver is improved;
when a small signal enters a receiver, the first-stage variable attenuator ATT1, the second-stage variable attenuator ATT2 and the variable gain amplifier VGA are all in a minimum attenuation state, along with the increase of the signal, the amplifier in a link can be saturated, the performance of the receiver is affected, the variable gain amplifier VGA, the second-stage variable attenuator ATT2 and the first-stage variable attenuator ATT1 need to be opened in sequence until the maximum attenuation state is reached, and high-dynamic receiving of the receiver is achieved through the combined use of the first-stage variable attenuator ATT1, the second-stage variable attenuator ATT2 and the variable gain amplifier VGA. Therefore, the large dynamic state of the receiver is realized, the noise coefficient of the receiver is reduced as much as possible, and the receiving sensitivity of the receiver is improved. By using the first stage variable attenuator ATT1, the second stage variable attenuator ATT2 and the variable gain amplifier VGA in combination, any amplifier in a link can be prevented from being saturated until the maximum signal input, so that the maximum performance of the receiver can be exerted.
Example 2
Referring to fig. 2, a low-noise high-dynamic zero intermediate frequency receiver includes a first-stage amplifier LNA1, a first-stage variable attenuator ATT1, a second-stage amplifier LNA2, a second-stage variable attenuator ATT2, a third-stage amplifier LNA3, a third-stage variable attenuator ATT3, a quadrature Mixer, a variable gain amplifier VGA, and an analog-to-digital converter ADC, which are connected in sequence.
Example 3
Referring to fig. 3, the low-noise high-dynamic zero-if receiver includes a first-stage amplifier LNA1, a first-stage variable attenuator ATT1, a second-stage amplifier LNA2, a second-stage variable attenuator ATT2, a quadrature Mixer, a first-stage variable gain amplifier VGA1, a second-stage variable gain amplifier VGA2, and an analog-to-digital converter ADC, which are connected in sequence. In the present embodiment, the variable gain amplifier includes a first stage variable gain amplifier VGA1 and a second stage variable gain amplifier VGA2, and in the present embodiment, the requirement of the receiver for large dynamic reception is achieved by using a variable attenuator and a variable gain amplifier, and meanwhile, two stages of low noise amplifiers are cascaded to ensure a small noise figure of the receiver.
Specifically, a radio frequency signal enters a receiver, sequentially passes through a first-stage amplifier LNA1, a first-stage variable attenuator ATT1, a second-stage amplifier LNA2 and a second-stage variable attenuator ATT2, enters a quadrature Mixer, and is mixed with a local oscillator signal LO provided by a local oscillator in the quadrature Mixer to form a baseband signal, and the baseband signal enters a variable gain amplifier until reaching an analog-digital converter (ADC).
In the embodiment, the first-stage amplifier LNA1 and the second-stage amplifier LNA2 both adopt a low noise amplifier design, and are cascaded, so that the noise coefficient of the receiver can be effectively reduced, and the receiving sensitivity of the receiver is improved; the large dynamic state of the receiver is realized, the noise coefficient of the receiver is reduced as much as possible, and the receiving sensitivity of the receiver is improved; and through the combined use of the first-stage variable attenuator ATT1, the second-stage variable attenuator ATT2 and the variable gain amplifier, any one amplifier in a link can be prevented from being saturated till the maximum signal input, so that the maximum performance of the receiver can be exerted.
Specifically, when a small signal enters the receiver, the first-stage variable attenuator ATT1, the second-stage variable attenuator ATT2 and the variable gain amplifier are all in a minimum attenuation state, along with the increase of the signal, the amplifier in a link can be saturated, the performance of the receiver is affected, the variable gain amplifier, the second-stage variable attenuator ATT2 and the first-stage variable attenuator ATT1 need to be opened in sequence until the maximum attenuation state is reached, and high-dynamic receiving of the receiver is achieved through the combined use of the first-stage variable attenuator ATT1, the second-stage variable attenuator ATT2 and the variable gain amplifier.
The embodiment can realize the large dynamic range reception of the receiver by the multi-stage extension of the variable attenuator and the variable gain amplifier.
In the embodiment, the first-stage amplifier LNA1 and the second-stage amplifier LNA2 are both designed by low-noise amplifiers, so that the noise coefficient of the receiver can be effectively reduced, and the receiving sensitivity of the receiver is improved; by using a combination of a multi-stage variable attenuator and a variable gain amplifier, saturation of any one amplifier in the chain up to a maximum signal input can be avoided for maximum performance of the receiver.
The technical principle of the present invention has been described above with reference to specific embodiments, which are merely preferred embodiments of the present invention. The utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongings the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. Those skilled in the art will appreciate that other embodiments of the invention can be devised which do not require inventive effort and which fall within the scope of the present invention.
Claims (5)
1. The low-noise high-dynamic zero intermediate frequency receiver is characterized by comprising a multi-stage amplifier and a multi-stage variable attenuator, wherein each stage of the multi-stage amplifier and each stage of the multi-stage variable attenuator are sequentially arranged adjacently, the quadrature mixer, at least one stage of variable gain amplifier and an analog-digital converter are sequentially connected, a radio-frequency signal is accessed to the input end of a first stage of amplifier in the multi-stage amplifier, and the output end of a last stage of variable attenuator in the multi-stage variable attenuator is connected with the input end of the quadrature mixer.
2. The low noise high dynamic zero intermediate frequency receiver according to claim 1, wherein the multi-stage amplifier comprises two stages of amplifiers, which are a first stage amplifier and a second stage amplifier, respectively, and the multi-stage variable attenuator comprises two stages of variable attenuators, which are a first stage variable attenuator and a second stage variable attenuator, respectively, and the first stage amplifier, the first stage variable attenuator, the second stage amplifier and the second stage variable attenuator are connected in sequence, and an output terminal of the second stage variable attenuator is connected to an input terminal of the quadrature mixer.
3. The low noise high dynamic zero intermediate frequency receiver according to claim 1, wherein the multistage amplifier comprises three stages of amplifiers, namely a first stage amplifier, a second stage amplifier and a third stage amplifier, respectively, the multistage variable attenuator comprises three stages of variable attenuators, namely a first stage variable attenuator, a second stage variable attenuator and a third stage variable attenuator, the first stage amplifier, the first stage variable attenuator, the second stage amplifier, the second stage variable attenuator, the third stage amplifier and the third stage variable attenuator are connected in sequence, and an output end of the third stage variable attenuator is connected with an input end of the quadrature mixer.
4. A low noise, high dynamic zero intermediate frequency receiver according to claim 1, comprising two stages of variable gain amplifiers, a first stage of variable gain amplifier and a second stage of variable gain amplifier, respectively, said first stage of variable gain amplifier being connected to said second stage of variable gain amplifier.
5. A low noise high dynamic zero intermediate frequency receiver according to claim 1, wherein the variable attenuator is a digital step attenuator or a voltage variable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222907171.5U CN217935600U (en) | 2022-11-02 | 2022-11-02 | Low-noise high-dynamic zero intermediate frequency receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222907171.5U CN217935600U (en) | 2022-11-02 | 2022-11-02 | Low-noise high-dynamic zero intermediate frequency receiver |
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| CN217935600U true CN217935600U (en) | 2022-11-29 |
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| CN202222907171.5U Active CN217935600U (en) | 2022-11-02 | 2022-11-02 | Low-noise high-dynamic zero intermediate frequency receiver |
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- 2022-11-02 CN CN202222907171.5U patent/CN217935600U/en active Active
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