A high- and low-performance frequency source channel transceiver sharing circuit

Abstract

A high- and low-performance frequency source channel transceiver sharing circuit is characterized by: a switch matrix; the control signal receiving end of the switch matrix is ​​connected to a controller; the first input of the switch matrix is ​​connected to a high-performance local oscillator; and the second input of the switch matrix is ​​connected to a low-performance local oscillator. The first output of the switch matrix outputs high / low performance local oscillators via a first signal processing circuit for use by the receiving circuit; the second output of the switch matrix outputs low / high performance local oscillators via a second signal processing circuit for use by the transmitting circuit. Advantages: It can quickly achieve the output of various combinations of high and low performance local oscillators at a relatively low cost, offering flexible and versatile applications. It has high economic benefits and practical value.

Description

Technical Field

[0001] This utility model relates to the field of frequency source channel transceiver technology, and in particular to a high- and low-performance frequency source channel transceiver shared circuit. Background Technology

[0002] In existing superheterodyne frequency conversion schemes, the up-conversion and down-conversion of the receiver or transmitter rely on the local oscillator signal provided by the frequency source, and its performance directly determines the overall performance of the communication link. In traditional schemes, the performance of the local oscillator signal is fixed, making it impossible to flexibly adjust the combination of high and low performance (phase noise) frequency sources according to different scenarios, resulting in the following problems: 1. High hardware cost: It is difficult for a single high-performance frequency source to meet both cost and performance requirements; 2. Poor application flexibility: A fixed-performance frequency source cannot adapt to dynamically changing communication needs. Utility Model Content

[0003] This invention provides a high- and low-performance frequency source channel transceiver sharing circuit, which can quickly output various high- and low-performance combinations of local oscillator sources to transmitters or receivers at a low cost, and has flexible and versatile applications.

[0004] To achieve the above objectives, this utility model provides a high- and low-performance frequency source channel transceiver sharing circuit. The key features are: a switch matrix is ​​provided, the control signal receiving end of the switch matrix is ​​connected to a controller, the first input end of the switch matrix is ​​connected to a high-performance local oscillator, and the second input end of the switch matrix is ​​connected to a low-performance local oscillator; the first output end of the switch matrix outputs high / low performance local oscillators via a first signal processing circuit for use by the receiving circuit, and the second output end of the switch matrix outputs low / high performance local oscillators via a second signal processing circuit for use by the transmitting circuit.

[0005] Through the above design, the controller controls the switching of the signal transmission path of the switching matrix according to the mixing requirements of the local oscillator signal of the receiver or transmitter, thereby realizing the flexible switching of the phase noise performance of the local oscillator signal of the whole machine, so that the whole machine can flexibly output various combinations of high and low performance local oscillator sources to the receiver or transmitter.

[0006] Preferably, the switch matrix is ​​provided with a first input RF switch, a second input RF switch, a first output RF switch, and a second output RF switch;

[0007] The input terminal of the first input RF switch is connected to a high-performance local oscillator; the first output terminal of the first input RF switch is connected to the first input terminal of the first output RF switch via a first RF switch combination; the second output terminal of the first input RF switch is connected to the first input terminal of the second output RF switch via a second RF switch combination.

[0008] The input terminal of the second input RF switch is connected to a low-performance local oscillator; the first output terminal of the second input RF switch is connected to the second input terminal of the first output RF switch via a third RF switch combination; the second output terminal of the second input RF switch is connected to the second input terminal of the second output RF switch via a fourth RF switch combination.

[0009] The output terminal of the first output RF switch is connected to the first signal processing circuit, and the output terminal of the second output RF switch is connected to the second signal processing circuit.

[0010] Preferably, in the switch matrix, the first output terminal of the first input RF switch, the first RF switch combination, and the first input terminal of the first output RF switch constitute a first local oscillator path; the second output terminal of the first input RF switch, the second RF switch combination, and the first input terminal of the second output RF switch constitute a second local oscillator path; the first output terminal of the second input RF switch, the third RF switch combination, and the second input terminal of the first output RF switch constitute a third local oscillator path; and the second output terminal of the second input RF switch, the fourth RF switch combination, and the second input terminal of the second output RF switch constitute a fourth local oscillator path.

[0011] The switching matrix allows for only two switching schemes: either the first and fourth local oscillator paths are enabled simultaneously, or the second and third local oscillator paths are enabled simultaneously. Specifically, when the first and fourth local oscillator paths are active, the second and third local oscillator paths are disabled; conversely, when the second and third local oscillator paths are active, the first and fourth local oscillator paths are disabled.

[0012] Preferably, the circuit structures of the first, second, third, and fourth RF switch combinations are identical, and each combination has at least two RF switches connected in series.

[0013] The switch matrix features high isolation. When a high / low performance local oscillator is selected via RF switches on paths 1 and 4, all RF switches on the branches of paths 1 and 4 are activated, while all RF switches on the branches of paths 2 and 3 are switched to isolated branches. Assuming all RF switches are of the same type, and the isolation between the two branches of each RF switch is A (in dB), then the isolation between the receiving local oscillator and the transmitting local oscillator is (N+2)*A. Theoretically, the larger the number of RF switches N, the better the isolation between the two local oscillators. However, in practical engineering applications, it is sufficient to meet the usage requirements. As can be seen from the formula (N+2)*A, if the isolation index of each RF switch is better, then the number of RF switches required is less. This can be determined according to the user's actual usage conditions.

[0014] Similarly, when the high / low performance local oscillator source selects path 2 and path 3 through the RF switch, all RF switches on the path 2 and path 3 branches are selected, and all RF switches on the path 1 and path 4 branches are switched to the isolation branch. The isolation is calculated in the same way as above, which is (N+2)*A, in dB.

[0015] Preferably, the circuit structures of the first input RF switch, the second input RF switch, the first output RF switch, the second output RF switch, and the RF switch are identical, and each is equipped with an RF switching device U9. The power supply terminal Vdd of the RF switching device U9 is connected to a 3.3V power supply after being connected in series with an inductor L8. The two ends of the inductor L8 are also connected in series with capacitors C65 and C75 respectively and then grounded. The control signal receiving terminal CTRL pin of the RF switching device U9 is connected to the controller after being connected in series with a resistor R56. The control signal receiving terminal CTRL pin is also connected in parallel with a grounded capacitor C72.

[0016] Preferably, the first signal processing circuit and the second signal processing circuit have the same circuit structure, both equipped with an attenuator U8. The input terminal of the attenuator U8 is connected in series with a capacitor C82 and then connected to the output terminal of the switch matrix. The output terminal of the attenuator U8 is connected in series with a capacitor C2, a resistor R1, and a capacitor C80 and then connected to the input terminal of the amplifier U7. The resistors R1, R2, and R3 form a fixed π-type attenuator. The input terminal of the amplifier U7 is connected in series with a resistor R58 and then connected to a +5V power supply. The output terminal of the amplifier U7 is connected in series with an inductor L10 and then connected to a +5V power supply. The output terminal of the amplifier U7 is also connected in series with a capacitor C81 and then connected to the input terminal of the filter F1. The output terminal of the filter outputs the local oscillator signal source.

[0017] The signal processing circuit is used to attenuate, amplify, and filter the local oscillator signal to improve signal quality.

[0018] Preferably, the phase noise range of the high-performance local oscillator is (-100, -120) dBc@1kHz, and the phase noise range of the low-performance local oscillator is (-90, -100] dBc@1kHz.

[0019] By switching different local oscillator paths using a switching matrix, rapid and flexible switching of local oscillator sources with different phase noise can be achieved.

[0020] The advantages of this invention are: it has a simple structure, can quickly output various high and low performance combinations of local oscillator sources for transmitters or receivers to use for frequency conversion at a low cost, and has flexible and versatile applications, with high economic benefits and practical value. Attached Figure Description

[0021] Figure 1 This is a circuit structure block diagram of the present invention;

[0022] Figure 2This is a circuit diagram showing the shared transceiver circuit for high and low performance frequency source channels in the embodiment;

[0023] Figure 3 This is a circuit diagram of the radio frequency switch in the embodiment;

[0024] Figure 4 This is a circuit diagram of the signal processing circuit in the embodiment;

[0025] Figure 5 This is a block diagram of the dual-channel transceiver shared circuit structure in the embodiment. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples. The following embodiments or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] like Figure 1 As shown, a high- and low-performance frequency source channel transceiver sharing circuit is provided, which includes a switch matrix. The control signal receiving end of the switch matrix is ​​connected to a controller. The first input end of the switch matrix is ​​connected to a high-performance local oscillator, and the second input end of the switch matrix is ​​connected to a low-performance local oscillator. The first output end of the switch matrix outputs a high / low performance local oscillator through a first signal processing circuit for use by the receiving circuit, and the second output end of the switch matrix outputs a low / high performance local oscillator through a second signal processing circuit for use by the transmitting circuit.

[0028] The switch matrix is ​​provided with a first input RF switch, a second input RF switch, a first output RF switch, and a second output RF switch;

[0029] The input terminal of the first input RF switch is connected to a high-performance local oscillator; the first output terminal of the first input RF switch is connected to the first input terminal of the first output RF switch via a first RF switch combination; the second output terminal of the first input RF switch is connected to the first input terminal of the second output RF switch via a second RF switch combination.

[0030] The input terminal of the second input RF switch is connected to a low-performance local oscillator; the first output terminal of the second input RF switch is connected to the second input terminal of the first output RF switch via a third RF switch combination; the second output terminal of the second input RF switch is connected to the second input terminal of the second output RF switch via a fourth RF switch combination.

[0031] The output terminal of the first output RF switch is connected to the first signal processing circuit, and the output terminal of the second output RF switch is connected to the second signal processing circuit.

[0032] In the switch matrix, the first output terminal of the first input RF switch, the first RF switch combination, and the first input terminal of the first output RF switch constitute a first local oscillator path; the second output terminal of the first input RF switch, the second RF switch combination, and the first input terminal of the second output RF switch constitute a second local oscillator path; the first output terminal of the second input RF switch, the third RF switch combination, and the second input terminal of the first output RF switch constitute a third local oscillator path; and the second output terminal of the second input RF switch, the fourth RF switch combination, and the second input terminal of the second output RF switch constitute a fourth local oscillator path.

[0033] The switching matrix has only two switching schemes: either the first local oscillator path and the fourth local oscillator path are enabled simultaneously, or the second local oscillator path and the third local oscillator path are enabled simultaneously.

[0034] like Figure 2 As shown, the circuit structures of the first, second, third, and fourth RF switch assemblies are identical, each consisting of two RF switches connected in series.

[0035] like Figure 3 As shown, the circuit structures of the first input RF switch, the second input RF switch, the first output RF switch, the second output RF switch, and the RF switch are identical, each equipped with an RF switch device U9. The power supply terminal Vdd of the RF switch device U9 is connected to a 3.3V power supply after being connected in series with an inductor L8. The two ends of the inductor L8 are also connected in series with capacitors C65 and C75 respectively and then grounded. The control signal receiving terminal CTRL pin of the RF switch device U9 is connected to the controller after being connected in series with a resistor R56. The control signal receiving terminal CTRL pin is also connected in parallel with a grounded capacitor C72.

[0036] like Figure 4 As shown, the first signal processing circuit and the second signal processing circuit have the same circuit structure, both equipped with an attenuator U8. The input terminal of the attenuator U8 is connected in series with a capacitor C82 and then to the output terminal of the switch matrix. The output terminal of the attenuator U8 is connected in series with a capacitor C2, a resistor R1, and a capacitor C80 and then to the input terminal of the amplifier U7. The resistors R1, R2, and R3 form a fixed π-type attenuator. The input terminal of the amplifier U7 is connected in series with a resistor R58 and then to a +5V power supply. The output terminal of the amplifier U7 is connected in series with an inductor L10 and then to a +5V power supply. The output terminal of the amplifier U7 is also connected in series with a capacitor C81 and then to the input terminal of the filter F1. The output terminal of the filter outputs the local oscillator signal source.

[0037] The phase noise range of the high-performance local oscillator is (-100, -120) dBc@1kHz, and the phase noise range of the low-performance local oscillator is (-90, -100] dBc@1kHz.

[0038] like Figure 5 As shown, this embodiment designs a dual-channel transceiver shared circuit. Its hardware architecture consists of two high-performance frequency sources and two low-performance frequency sources. Then, the local oscillator signal is allocated to the transceiver channel through two sets of switch matrices.

[0039] This dual-channel transceiver sharing circuit achieves the following functions by controlling the combination and change of the switch matrix through program control:

[0040] a. Allows for flexible allocation of high / low performance frequency source combinations for transceiver channels;

[0041] b. Supports four working modes (high-high, high-low, low-high, low-low) to meet different overall machine performance requirements;

[0042] This invention employs a high-isolation switch isolation branch design to ensure high isolation between the transmitting and receiving channels.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high- and low-performance frequency source channel transceiver sharing circuit, characterized in that: A switch matrix is ​​provided, with its control signal receiving end group connected to a controller. The first input end of the switch matrix is ​​connected to a high-performance local oscillator, and the second input end of the switch matrix is ​​connected to a low-performance local oscillator. The first output end of the switch matrix outputs a high / low performance local oscillator through a first signal processing circuit for use by the receiving circuit, and the second output end of the switch matrix outputs a low / high performance local oscillator through a second signal processing circuit for use by the transmitting circuit.

2. The high-low performance frequency source transceiver sharing circuit according to claim 1, wherein: The switch matrix is ​​provided with a first input RF switch, a second input RF switch, a first output RF switch, and a second output RF switch; The input terminal of the first input RF switch is connected to a high-performance local oscillator; the first output terminal of the first input RF switch is connected to the first input terminal of the first output RF switch via a first RF switch combination; the second output terminal of the first input RF switch is connected to the first input terminal of the second output RF switch via a second RF switch combination. The input terminal of the second input RF switch is connected to a low-performance local oscillator; the first output terminal of the second input RF switch is connected to the second input terminal of the first output RF switch via a third RF switch combination; the second output terminal of the second input RF switch is connected to the second input terminal of the second output RF switch via a fourth RF switch combination. The output terminal of the first output RF switch is connected to the first signal processing circuit, and the output terminal of the second output RF switch is connected to the second signal processing circuit.

3. The high-low performance frequency source transceiver sharing circuit of claim 2, wherein: In the switch matrix, the first output terminal of the first input RF switch, the first RF switch combination, and the first input terminal of the first output RF switch constitute a first local oscillator path; the second output terminal of the first input RF switch, the second RF switch combination, and the first input terminal of the second output RF switch constitute a second local oscillator path; the first output terminal of the second input RF switch, the third RF switch combination, and the second input terminal of the first output RF switch constitute a third local oscillator path; and the second output terminal of the second input RF switch, the fourth RF switch combination, and the second input terminal of the second output RF switch constitute a fourth local oscillator path. The switching matrix has only two switching schemes: either the first local oscillator path and the fourth local oscillator path are enabled simultaneously, or the second local oscillator path and the third local oscillator path are enabled simultaneously.

4. The high-low performance frequency source transceiver sharing circuit of claim 2, wherein: The first, second, third, and fourth RF switch assemblies have the same circuit structure, and each has at least two RF switches connected in series.

5. The high-low performance frequency source transceiver sharing circuit of claim 4, wherein: The circuit structures of the first input RF switch, the second input RF switch, the first output RF switch, the second output RF switch, and the RF switch are identical, each equipped with an RF switching device U9. The power supply terminal Vdd of the RF switching device U9 is connected to a 3.3V power supply after being connected in series with an inductor L8. The two ends of the inductor L8 are also connected in series with capacitors C65 and C75 respectively and then grounded. The control signal receiving terminal CTRL pin of the RF switching device U9 is connected to the controller after being connected in series with a resistor R56. The control signal receiving terminal CTRL pin is also connected in parallel with a grounded capacitor C72.

6. The high-low performance frequency source transceiving sharing circuit according to claim 1 or 2, characterized in that: The first signal processing circuit and the second signal processing circuit have the same circuit structure, both of which are equipped with an attenuator U8. The input terminal of the attenuator U8 is connected in series with a capacitor C82 and then connected to the output terminal of the switch matrix. The output terminal of the attenuator U8 is connected in series with a capacitor C2, a resistor R1, and a capacitor C80 and then connected to the input terminal of the amplifier U7. The resistors R1, R2, and R3 form a fixed π-type attenuator. The input terminal of the amplifier U7 is connected in series with a resistor R58 and then connected to a +5V power supply. The output terminal of the amplifier U7 is connected in series with an inductor L10 and then connected to a +5V power supply. The output terminal of the amplifier U7 is also connected in series with a capacitor C81 and then connected to the input terminal of the filter F1. The output terminal of the filter outputs the local oscillator signal source.

7. The high-low performance frequency source transceiver sharing circuit of claim 1, wherein: The phase noise range of the high-performance local oscillator is (-100, -120) dBc@1kHz, and the phase noise range of the low-performance local oscillator is (-90, -100] dBc@1kHz.

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