CN218772032U - wireless signal filter - Google Patents

Abstract

The utility model discloses a wireless signal filter, including the PCBA board, the circuit coupling on the PCBA board has three operational amplifier, and wireless signal's input is connected with first operational amplifier's inverting input electricity, first operational amplifier's syntropy input is connected with resistance R1 electricity back ground connection, and second operational amplifier's syntropy input is connected with first operational amplifier's output electricity, and second operational amplifier's reverse input end is connected with third operational amplifier's inverting input electricity, is connected with second operational amplifier's forward input electricity behind a resistance R7 electricity after third operational amplifier's the output electricity, is connected with second operational amplifier's output electricity behind a resistance R9 electricity after third operational amplifier's the forward input electricity, exports wireless signal after second operational amplifier's the output electricity is connected an electric capacity C6.

Description

wireless signal filter

technical field

The utility model relates to the field of signal filtering, in particular to a wireless signal filter.

Background technique

A filter is a filter circuit composed of capacitors, inductors and resistors. The filter can effectively filter out the frequency point of a specific frequency in the power line or frequencies other than this frequency point, and obtain a power signal of a specific frequency, or eliminate a power signal of a specific frequency, but the existing filter is limited in bandwidth When filtering specific frequency points again within the range, it is difficult to achieve precise filtering.

Utility model content

In order to achieve the above object, the utility model provides the following technical solutions:

The wireless signal filter includes a PCBA board, the circuit on the PCBA board is coupled with three operational amplifiers, the input terminal of the wireless signal is electrically connected with the inverting input terminal of the first operational amplifier, and the same The input terminal of the second operational amplifier is electrically connected to the resistor R1 and then grounded, the same input terminal of the second operational amplifier is electrically connected to the output terminal of the first operational amplifier, and the inverting input terminal of the second operational amplifier is connected to the output terminal of the third operational amplifier. The inverting input terminal is electrically connected, the output terminal of the third operational amplifier is electrically connected to a resistor R7 and then electrically connected to the positive input terminal of the second operational amplifier, and the positive input terminal of the third operational amplifier is electrically connected to a resistor R9 Afterwards, it is electrically connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is electrically connected to a capacitor C6 to output the wireless signal.

Further, a resistor R3 and a resistor R4 are electrically connected between the inverting input terminal of the first operational amplifier and the input terminal of the wireless signal, and a branch is provided on the line between the resistor R3 and the resistor R4, and the branch is connected to the The output terminal of the first operational amplifier is electrically connected, and a capacitor C1 is provided on the branch, and a branch is provided on the line between the resistor R4 and the inverting input terminal of the first operational amplifier, and a capacitor is provided on the branch C2, the output end of the capacitor C2 is grounded.

Further, the non-inverting input terminal of the first operational amplifier is electrically connected to the resistor R2 and then electrically connected to the output terminal of the first operational amplifier.

Further, the non-inverting input terminal of the second operational amplifier is electrically connected to the capacitor C3 and the capacitor C4 between the output terminal of the first operational amplifier, and the positive input terminal of the third operational amplifier is electrically connected to a resistor R10 and then connected to the capacitor The input terminal of C4 is electrically connected.

Further, the output end of the capacitor C4 is electrically connected to a resistor R6 and then grounded, and a resistor R5 is also electrically connected between the input end of the capacitor C4 and the input end of the resistor R6.

Compared with the prior art, the beneficial effects of the utility model are as follows:

In this application, by coupling three operational amplifiers, the filter bandwidth within a specific range can be increased in the circuit, and specific frequency points can be accurately filtered within a specific range, thereby enriching the filtering function of the filter.

Description of drawings

Fig. 1 is the circuit schematic diagram of the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The utility model discloses a wireless signal filter, as shown in Figure 1, the wireless signal filter includes a PCBA board, the circuit on the PCBA board is coupled with three operational amplifiers, the input end of the wireless signal is connected to the first operational amplifier The inverting input terminal of the first operational amplifier is electrically connected to the inverting input terminal of the first operational amplifier, which is electrically connected to the resistor R1 and then grounded, and the same inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the first operational amplifier. The inverting input terminal of the second operational amplifier is electrically connected to the inverting input terminal of the third operational amplifier, and the output terminal of the third operational amplifier is electrically connected to a resistor R7 and electrically connected to the positive input terminal of the second operational amplifier. connection, the positive input terminal of the third operational amplifier is electrically connected to a resistor R9 and then electrically connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is electrically connected to a capacitor C6 to output the wireless signal. In this application, by coupling three operational amplifiers, the filter bandwidth within a specific range can be increased in the circuit, and specific frequency points can be accurately filtered within a specific range, thereby enriching the filtering function of the filter.

Preferably, a resistor R3 and a resistor R4 are electrically connected between the inverting input terminal of the first operational amplifier and the input terminal of the wireless signal, and a branch is provided on the line between the resistor R3 and the resistor R4, and the branch circuit It is electrically connected with the output terminal of the first operational amplifier, and a capacitor C1 is provided on the branch, and a branch is provided on the circuit between the resistance R4 and the inverting input terminal of the first operational amplifier, and a branch is provided on the branch. Capacitor C2, the output end of capacitor C2 is grounded.

Preferably, the non-inverting input terminal of the first operational amplifier is electrically connected to the resistor R2 and then electrically connected to the output terminal of the first operational amplifier.

Preferably, the non-inverting input terminal of the second operational amplifier is electrically connected to the capacitor C3 and the capacitor C4 between the output terminal of the first operational amplifier, and the positive input terminal of the third operational amplifier is electrically connected to a resistor R10. The input end of the capacitor C4 is electrically connected.

Preferably, the output terminal of the capacitor C4 is electrically connected to a resistor R6 and then grounded, and a resistor R5 is also electrically connected between the input terminal of the capacitor C4 and the input terminal of the resistor R6.

In a specific embodiment, the utility model discloses a wireless signal filter. As shown in FIG. 1, the wireless signal filter includes a PCBA board, and the circuit on the PCBA board is coupled with three operational amplifiers. The input end of the first operational amplifier is electrically connected to the inverting input end of the first operational amplifier, the same-inverting input end of the first operational amplifier is electrically connected to the resistor R1 and then grounded, and the same-inverting input end of the second operational amplifier is connected to the first The output terminal of the first operational amplifier is electrically connected, the inverting input terminal of the second operational amplifier is electrically connected with the inverting input terminal of the third operational amplifier, and the output terminal of the third operational amplifier is electrically connected with a resistor R7 and then connected with the second operational amplifier. The positive input terminal of the first operational amplifier is electrically connected, the positive input terminal of the third operational amplifier is electrically connected with a resistor R9 and then electrically connected with the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is electrically connected to a After the capacitor C6, the wireless signal is output; the inverting input terminal of the first operational amplifier and the input terminal of the wireless signal are electrically connected with a resistor R3 and a resistor R4, and a circuit between the resistor R3 and the resistor R4 is provided with a Road, this branch is electrically connected to the output terminal of the first operational amplifier, and a capacitor C1 is provided on the branch, and the circuit between the resistor R4 and the inverting input terminal of the first operational amplifier is provided with a branch, A capacitor C2 is arranged on the branch, and the output end of the capacitor C2 is grounded; the same direction input end of the first operational amplifier is electrically connected with the resistance R2 and then electrically connected with the output end of the first operational amplifier; the second operational amplifier The same direction input terminal of the first operational amplifier is electrically connected to the capacitor C3 and the capacitor C4 between the output terminal of the first operational amplifier, and the positive input terminal of the third operational amplifier is electrically connected to a resistor R10 and then electrically connected to the input terminal of the capacitor C4; The output terminal of the capacitor C4 is electrically connected to a resistor R6 and grounded, and the input terminal of the capacitor C4 and the input terminal of the resistor R6 are also electrically connected to a resistor R5. In this application, by coupling three operational amplifiers, the filter bandwidth within a specific range can be increased in the circuit, and specific frequency points can be accurately filtered within a specific range, thereby enriching the filtering function of the filter.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. wireless signal filter, it is characterized in that, comprise PCBA board, the circuit coupling on described PCBA board has three operational amplifiers, the input end of wireless signal is electrically connected with the inverting input end of the first operational amplifier, and described first The same-inverting input terminal of one operational amplifier is electrically connected to the resistor R1 and then grounded, the same-inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the first operational amplifier, and the inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the first operational amplifier. The inverting input terminal of the third operational amplifier is electrically connected, the output terminal of the third operational amplifier is electrically connected to a resistor R7 and then electrically connected to the positive input terminal of the second operational amplifier, and the positive input terminal of the third operational amplifier The terminal is electrically connected to a resistor R9 and then electrically connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is electrically connected to a capacitor C6 to output the wireless signal. 2. The wireless signal filter according to claim 1, wherein a resistor R3, a resistor R4, a resistor R3, and a resistor R3 are electrically connected between the inverting input end of the first operational amplifier and the input end of the wireless signal. A branch is arranged on the line between the resistors R4, and the branch is electrically connected to the output terminal of the first operational amplifier, and a capacitor C1 is arranged on the branch, and the resistor R4 is connected to the inverting input of the first operational amplifier. The line between the terminals is provided with a branch, and a capacitor C2 is provided on the branch, and the output terminal of the capacitor C2 is grounded. 3. The wireless signal filter according to claim 2, wherein the non-inverting input terminal of the first operational amplifier is electrically connected to the resistor R2 and then electrically connected to the output terminal of the first operational amplifier. 4. The wireless signal filter according to claim 3, characterized in that, the same direction input terminal of the second operational amplifier and the output terminal of the first operational amplifier are electrically connected with capacitor C3 and capacitor C4, and the third The positive input terminal of the operational amplifier is electrically connected to a resistor R10 and then electrically connected to the input terminal of the capacitor C4. 5. The wireless signal filter according to claim 4, wherein the output end of the capacitor C4 is electrically connected to a resistor R6 and then grounded, and a resistor R5 is also electrically connected between the input end of the capacitor C4 and the input end of the resistor R6 .

Images