4*4 radio frequency switching control circuit

Abstract

The utility model discloses a 4 * 4 radio frequency switching control circuit, which comprises logic units and radio frequency switch units, the logic units are connected with the radio frequency switch units, the logic units comprise four groups of logic units, the radio frequency switch units comprise four groups of radio frequency switch units, and the logic units and a radio frequency switch power supply form the radio frequency switching control circuit. According to the utility model, related indexes are controlled in a relatively reasonable range, signal crosstalk and coupling among different radio frequency channels are reduced, and N * N radio frequency switching can be realized by upgrading the circuit in the later period.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency signal circuits, in particular to a 4×4 radio frequency switching control circuit. Background Art

[0002] For multi-channel shortwave power amplifier systems, a switching unit is usually used to adapt different RF channels based on a single power amplifier unit. With the development of shortwave communication technology and microelectronics technology, higher requirements are put forward. Therefore, it is necessary to be able to switch between any transmitter port and any antenna port. A matrix structure circuit or a RF switching circuit is required before the multi-stage power amplifier. In particular, a RF switching control circuit with fast and accurate switching, low loss and high isolation is required.

[0003] In view of the above problems, the utility model provides a 4×4 radio frequency switching control circuit which is simple in circuit and easy to integrate. Utility Model Content

[0004] The utility model provides a 4×4 radio frequency switching control circuit which has a simple circuit and is easy to integrate.

[0005] The purpose of the utility model is to provide a 4×4 radio frequency switching control circuit, including a logic unit and a radio frequency switch unit, the logic unit is connected to the radio frequency switch unit, the logic unit includes four groups of logic units, the radio frequency switch unit includes four groups of radio frequency switch units, and the logic unit and the radio frequency switch power supply constitute a radio frequency switching control circuit.

[0006] Furthermore, the four groups of logic units include D flip-flops and Darlington drivers, and the D flip-flops and Darlington drivers are connected.

[0007] Furthermore, each of the four groups of radio frequency switch units includes two relays.

[0008] The utility model has the following advantages: the relevant indicators of the utility model are controlled within a reasonable range, the signal crosstalk and coupling between different radio frequency channels are reduced, and the radio frequency switching of N×N channels can be realized by upgrading the circuit in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a logic unit circuit diagram of the utility model;

[0010] Figure 2 This is a circuit diagram of the radio frequency switch unit of the utility model. DETAILED DESCRIPTION

[0011] The utility model provides a 4×4 radio frequency switching control circuit, comprising a logic unit and a radio frequency switch unit, wherein the logic unit is connected to the radio frequency switch unit, the logic unit comprises four groups of logic units, the radio frequency switch unit comprises four groups of radio frequency switch units, and the logic unit and the radio frequency switch power supply form a radio frequency switching control circuit.

[0012] In this embodiment, the four groups of logic units include D flip-flops and Darlington drivers, and the D flip-flops and Darlington drivers are connected.

[0013] In this embodiment, each of the four groups of radio frequency switch units includes two relays.

[0014] In this embodiment, the D flip-flop uses SN74HCT574N, which is an octal edge-triggered D-type flip-flop with three-state outputs. The operating voltage range is 4.5V to 5.5V, the high-current three-state in-phase output directly drives the bus or drives up to 15 LSTTL loads, low power consumption, ICC maximum value is 80μA, and the input is compatible with TTL voltage.

[0015] In this embodiment, the Darlington driver uses ULN2003AD, which is a monolithic high-voltage, high-current Darlington transistor array integrated circuit. It is composed of 7 pairs of NPN Darlington tubes, and its high voltage output characteristics and cathode clamping diode can convert inductive loads. The collector current of a single Darlington pair is 500mA. Darlington tubes in parallel can withstand larger currents. This circuit is mainly used in relay drivers, hammer drivers, lamp drivers, display drivers (LED gas discharge), line drivers and logic buffers. Each pair of Darlington tubes of ULN2003 has a 2.7kΩ series resistor, which can be directly connected to TTL or 5VCMOS devices.

[0016] In this embodiment, the RF signal switching circuit is constructed by IC, relays, etc., to complete the input and output port selection and switching control when the equipment switches the vertical and horizontal matrices, and realize the switching of 4 RF signals. It has the characteristics of easy integration, simple circuit, high serial reliability, high performance-price ratio, and low power consumption.

[0017] In this embodiment, the 4 ports to be input, Port11, Port12, Port13, Port14, and the 4 ports to be output, Port21, Port22, Port23, Port24, that is, through this circuit, any connection and disconnection between the 4 input ports and the 4 output ports can be achieved, and the function of "one-to-one" connection can be realized.

[0018] In this embodiment, +12V is output through the logic unit to different RF switch units to control their relays to close, thereby completing the switching of the RF switch units.

[0019] In this embodiment, the relevant indicators are controlled within a reasonable range through the design of the circuit, reducing signal crosstalk and coupling between different RF channels. In the future, N×N RF switching can be achieved by upgrading the circuit.

[0020] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A 4×4 radio frequency switching control circuit, comprising a logic unit and a radio frequency switch unit, characterized in that: The logic unit is connected to the radio frequency switch unit, the logic unit includes four groups of logic units, the radio frequency switch unit includes four groups of radio frequency switch units, the logic unit and the radio frequency switch power supply form a radio frequency switching control circuit, the four groups of logic units include a D flip-flop and a Darlington driver, and the D flip-flop and the Darlington driver are connected.

2. A 4×4 radio frequency switching control circuit as claimed in claim 1, characterized in that: Each of the four groups of radio frequency switch units includes two relays.

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