A high dynamic UHF band receiving circuit

Abstract

The utility model discloses a high dynamic UHF frequency band receiving circuit, including antenna J1, frequency hopping filter, low noise amplifier, AGC amplifier, radio frequency balun ware and radio frequency receiver that connect gradually, frequency hopping filter is used for filtering the strong interference signal in the input signal of communication inband and outband from antenna J1, low noise amplifier is used for in its strong receiving signal state, inhibit strong interference signal in the process of switching to the straight -through state, to improve dynamic range, AGC amplifier is used for adjusting gain to adapt to different signal intensity, radio frequency balun ware is used for adjusting the impedance characteristic of UHF frequency band receiving circuit, to realize the stability of input signal transmission, and radio frequency receiver is used for detecting the strong and weak of input signal and adjusts the gain of UHF frequency band receiving circuit. The utility model circuit is simple, and the cost is low, and the circuit is integrated based on various kinds of chip integration, and the circuit integration is high, and can realize high dynamic range.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, specifically a high-dynamic UHF band receiving circuit. Background Technology

[0002] The ultra-high frequency band (UHF band, 300MHz-3GHz) is widely used in civilian IoT, broadcasting, broadcasting systems, and military communications due to its excellent propagation characteristics. Currently, troubleshooting UHF band receivers faces challenges such as strong adjacent channel interference and blocking signals.

[0003] Existing UHF band receiver circuits generally consist of multi-stage fixed gain amplification, fixed frequency band filtering, and mixing modules. They are prone to saturation distortion when receiving strong signals and their sensitivity is difficult to meet requirements when receiving weak signals. As a result, the dynamic range of traditional UHF receivers is greatly reduced and insufficient. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a high dynamic UHF band receiving circuit that can solve the problems described in the background art.

[0005] The technical solution to achieve the purpose of this utility model is as follows: a high dynamic UHF band receiving circuit, comprising an antenna J1, a frequency hopping filter, a low noise amplifier, an AGC amplifier, an RF balun, and an RF receiver connected in sequence. The frequency hopping filter is used to filter out strong interference signals, both in-band and out-of-band, from the input signal from antenna J1. Low-noise amplifiers are used to suppress strong interference signals during the switching from a strong receive signal state to a pass-through state, thereby improving dynamic range. AGC amplifiers are used to adjust the gain to suit different signal strengths. The radio frequency balun is used to adjust the impedance characteristics of the UHF band receiving circuit to achieve stable input signal transmission. The radio frequency receiver is used to detect the strength of the input signal and adjust the gain of the UHF band receiving circuit.

[0006] Furthermore, the frequency hopping filter includes a filter chip U1. The RF1 pin of the filter chip U1 is connected to the antenna after being connected in series with a capacitor C3. The SEL and VDD pins of the filter chip U1 are respectively connected to a 3.31V voltage. The RF2 pin of the filter chip U1 is connected to the low noise amplifier after being connected in series with a capacitor C5.

[0007] Furthermore, the filter chip U1 can be an ADMV8513 chip.

[0008] Furthermore, the low-noise amplifier includes an amplification chip U2, the RFin pin of the amplification chip U2 is connected in series with a capacitor C5 and the filter chip U1, the Vdd pin of the filter chip U2 is connected to a 5.1V voltage, and the RFout pin of the filter chip U2 is connected in series with a capacitor C6 and then connected to the AGC amplifier.

[0009] Furthermore, the amplifier chip U2 can be selected as TSS-53LNB+.

[0010] Furthermore, the AGC amplifier includes an amplifier chip U3. The INPT pin of the amplifier chip U3 is connected in series with a capacitor C6 and is connected to the amplifier chip U2. The three pins VPSI and two pins VPSO of the amplifier chip U3 are all connected to a 5.2V voltage. The OUTP pin of the amplifier chip U3 is connected in series with a capacitor C8 and is then connected to an RF balun.

[0011] Furthermore, the amplifier chip U3 can be selected as AD8368ACPZ.

[0012] Furthermore, the RF balun includes a transformer U5, a series capacitor C8 connected to a primary coil of the transformer U5 is connected to an amplifier chip U3, the other end of the primary coil is grounded, the two ends of the secondary coil of the transformer U5 are connected to one end of a capacitor C4, and the other end of a capacitor C7 is connected to an RF receiver.

[0013] Furthermore, the RF receiver includes an RF receiver chip U4. The RFINP and RFINN pins of the RF receiver chip U4 are connected to the other end of the capacitor C4, thereby enabling connection with the RF balun. The two pins AVDD and RFVDD of the RF receiver chip U4 are each connected to a 3.32V voltage.

[0014] Furthermore, the model of the RF receiver chip U4 can be KT0616M.

[0015] The beneficial effects of this utility model are: the circuit of this utility model is simple and low in cost. It is based on the integration of various chips to form a circuit, which has a high degree of integration and can achieve a high dynamic range. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the principle framework of this utility model; Figure 2 This is a circuit diagram of the present invention; Figures 3-8 for Figure 2 The circuit diagrams for each part are shown. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-8 As shown, a high-dynamic UHF band receiving circuit includes an antenna J1, a frequency-hopping filter, a low-noise amplifier, an AGC amplifier, an RF balun, and an RF receiver connected in sequence. The frequency-hopping filter is used to filter strong interference signals (i.e., interference signals with very close frequency bands) both within and outside the communication band from the input signal from the antenna J1. The low-noise amplifier is used to suppress strong interference signals during the switching from a strong receive signal state to a pass-through state, thereby improving the dynamic range. The AGC amplifier is used to adjust the gain to accommodate different signal strengths. The RF balun is used to adjust the impedance characteristics of the UHF band receiving circuit to achieve stable input signal transmission. The RF receiver is used to detect the strength of the input signal and adjust the gain of the UHF band receiving circuit to further improve the dynamic range.

[0018] Understandably, AGC amplifiers provide high gain and low noise figure for small signals (i.e., input signals with small amplitude), and provide a certain signal attenuation for large signals (i.e., input signals with large amplitude) to ensure that the subsequent stage remains linear.

[0019] By adding a frequency-hopping filter between antenna J1 and the low-noise amplifier, interference signals both in-band and out-of-band can be filtered out simultaneously. If strong interference signals exist in the current channel, the communication frequency can be switched quickly. Simultaneously, the low-noise amplifier can switch its gain and pass-through mode to protect the subsequent stages, significantly improving the dynamic range of the UHF band receiving circuit.

[0020] By employing an AGC amplifier, it is possible to quickly switch between strong and weak signals, thereby improving receiving sensitivity and anti-interference capability.

[0021] Frequency hopping filters, low-noise amplifiers, AGC amplifiers, RF baluns, and RF receivers are all based on chip-based circuits, enabling microstrip structure design and integrated packaging to reduce size and make them suitable for portable devices or miniaturized systems.

[0022] For example, the frequency hopping filter includes a filter chip U1, with the RF1 pin of the filter chip U1 connected to the antenna via a series capacitor C3, the SEL pin and VDD pin of the filter chip U1 connected to a 3.31V voltage, and the RF2 pin of the filter chip U1 connected to the low noise amplifier via a series capacitor C5.

[0023] The filter chip U1 can be an ADMV8513 chip.

[0024] The external 3.31V voltage can be supplied through an external voltage circuit (i.e., Figure 8 (Illustrated external voltage circuit) is provided.

[0025] For example, the low-noise amplifier includes an amplification chip U2, with its pin RFin connected in series with a capacitor C5 and the filter chip U1. The filter chip U2's pin Vdd is connected to a 5.1V voltage, and its pin RFout is connected in series with a capacitor C6 and then connected to the AGC amplifier.

[0026] The amplifier chip U2 can be selected as TSS-53LNB+.

[0027] For example, the AGC amplifier includes an amplifier chip U3, the INPT pin of the amplifier chip U3 is connected in series with a capacitor C6 and the amplifier chip U2, the three pins VPSI and two pins VPSO of the amplifier chip U3 are all connected to a 5.2V voltage, and the OUTP pin of the amplifier chip U3 is connected in series with a capacitor C8 and then connected to an RF balun.

[0028] The amplifier chip U3 can be selected as AD8368ACPZ.

[0029] For example, the RF balun includes a transformer U5, a series capacitor C8 of the primary coil of the transformer U5 is connected to an amplifier chip U3, the other end of the primary coil is grounded, the two ends of the secondary coil of the transformer U5 are connected to one end of a capacitor C4, and the other end of a capacitor C7 is connected to an RF receiver.

[0030] The transformer U5 can be of model TC1-15+.

[0031] For example, the RF receiver includes an RF receiver chip U4. Pins RFINP and RFINN of the RF receiver chip U4 are connected to the other end of capacitor C4, thereby enabling connection to an RF balun. Pins AVDD and RFVDD of the RF receiver chip U4 are each connected to a 3.32V voltage.

[0032] The KT0616M model can be selected for the RF receiver chip U4.

[0033] The different voltage values ​​required for connection mentioned above are all provided by external voltage circuits, which can provide various voltages. Specifically, the different voltages provided are as follows: Figure 8 As shown, how it achieves voltage conversion is a common voltage conversion technology in circuits, which is existing technology and will not be elaborated here.

[0034] Figures 2-8 The specific parameter values ​​of each component (capacitor, resistor, etc.) can be determined as needed. Those skilled in the art can determine the values ​​of each component based on the provided circuit diagram and the required voltage, so the specific values ​​of each component will not be described here.

[0035] This invention features a simple and low-cost circuit. It is based on the integration of various chips to form a circuit with high integration and the ability to achieve a high dynamic range.

[0036] The embodiments disclosed in this specification are merely illustrative of one aspect of the features of this utility model. The protection scope of this utility model is not limited to this embodiment, and any other functionally equivalent embodiments fall within the protection scope of this utility model. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model.

Claims

1. A high-dynamic UHF band receiving circuit, characterized in that, It includes, in sequence, an antenna J1, a frequency hopping filter, a low-noise amplifier, an AGC amplifier, an RF balun, and an RF receiver. The frequency hopping filter is used to filter out strong interference signals, both in-band and out-of-band, from the input signal from antenna J1. Low-noise amplifiers are used to suppress strong interference signals during the switching from a strong receive signal state to a pass-through state, thereby improving dynamic range. AGC amplifiers are used to adjust the gain to suit different signal strengths. The radio frequency balun is used to adjust the impedance characteristics of the UHF band receiving circuit to achieve stable input signal transmission. The radio frequency receiver is used to detect the strength of the input signal and adjust the gain of the UHF band receiving circuit.

2. The high dynamic range UHF band receiving circuit according to claim 1, characterized in that, The frequency hopping filter includes a filter chip U1. Pin RF1 of the filter chip U1 is connected to the antenna after being connected in series with capacitor C3. Pins SEL and VDD of the filter chip U1 are connected to a 3.31V voltage. Pin RF2 of the filter chip U1 is connected to the low noise amplifier after being connected in series with capacitor C5.

3. The high dynamic range UHF band receiving circuit according to claim 2, characterized in that, The filter chip U1 can be an ADMV8513 chip.

4. The high dynamic range UHF band receiving circuit according to claim 2, characterized in that, The low-noise amplifier includes an amplification chip U2. The RFin pin of the amplification chip U2 is connected in series with a capacitor C5 and is connected to the filter chip U1. The Vdd pin of the filter chip U2 is connected to a 5.1V voltage. The RFout pin of the filter chip U2 is connected in series with a capacitor C6 and is connected to the AGC amplifier.

5. The high dynamic range UHF band receiving circuit according to claim 4, characterized in that, The amplifier chip U2 can be selected as TSS-53LNB+.

6. The high dynamic range UHF band receiving circuit according to claim 4, characterized in that, The AGC amplifier includes an amplifier chip U3. The INPT pin of the amplifier chip U3 is connected to the amplifier chip U2 via a series capacitor C6. The three pins VPSI and two pins VPSO of the amplifier chip U3 are all connected to a 5.2V voltage. The OUTP pin of the amplifier chip U3 is connected to the RF balun via a series capacitor C8.

7. The high dynamic range UHF band receiving circuit according to claim 6, characterized in that, The amplifier chip U3 can be selected as AD8368ACPZ.

8. The high dynamic range UHF band receiving circuit according to claim 6, characterized in that, The RF balun includes a transformer U5. One end of the primary coil of the transformer U5 is connected in series with a capacitor C8 and is connected to an amplifier chip U3. The other end of the primary coil is grounded. The two ends of the secondary coil of the transformer U5 are connected to one end of a capacitor C4, and the other end of a capacitor C7 is connected to an RF receiver.

9. The high dynamic range UHF band receiving circuit according to claim 8, characterized in that, The radio frequency receiver includes a radio frequency receiver chip U4. The RFINP and RFINN pins of the radio frequency receiver chip U4 are connected to the other end of the capacitor C4, thereby connecting to the radio frequency balun. The two pins AVDD and RFVDD of the radio frequency receiver chip U4 are each connected to a 3.32V voltage.

10. The high dynamic range UHF band receiving circuit according to claim 9, characterized in that, The KT0616M model can be selected for the RF receiver chip U4.

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