CN213754490U

CN213754490U - Frequency-selecting characteristic and impedance conversion communication circuit

Info

Publication number: CN213754490U
Application number: CN202022998620.2U
Authority: CN
Inventors: 梁碧娱
Original assignee: Foshan Shunde Junda Electronic Co Ltd
Current assignee: Foshan Shunde Junda Electronic Co Ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-07-20
Anticipated expiration: 2030-12-14

Abstract

The utility model relates to a frequency-selective characteristic and impedance transformation communication circuit, including first frequency-selective amplifier module and second frequency-selective amplifier module, first frequency-selective amplifier module and second frequency-selective amplifier module respectively with impedance transformation module electric connection, intermediate frequency transformer T1, T2 can be respectively to signal receiver W1, W2's small-signal carries out frequency selection and once enlargies, the noise in the certain limit of discharge, the signal after the enlarging is more accurate in the processing of impedance transformation module, circuit structure is simple, and is reliable.

Description

Frequency-selecting characteristic and impedance conversion communication circuit

Technical Field

The utility model belongs to a communication circuit's technical field, concretely relates to frequency-selecting characteristic and impedance transformation communication circuit.

Background

In the impedance transformation communication circuit capable of selecting different frequencies, the signal amplitude received by the signal receiving transducer is small, so that the signal is easily interfered by external environment noise, circuit noise, power supply noise and the like in the transmission process.

Therefore, further improvements are needed.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to overcome the disadvantages of the prior art, and to provide a frequency-selective and impedance-transforming communication circuit, which is at least to solve one of the above technical problems in the prior art to a certain extent.

The purpose of the utility model is realized like this:

a frequency-selecting characteristic and impedance transformation communication circuit comprises a first frequency-selecting amplification module and a second frequency-selecting amplification module, wherein the first frequency-selecting amplification module and the second frequency-selecting amplification module are respectively electrically connected with an impedance transformation module;

the first frequency-selective amplification module comprises a signal receiver W1, resistors R1, R2, amplitude limiting diodes D1, D2, an intermediate frequency transformer T1, a capacitor C1, a primary pin 1 of the intermediate frequency transformer T1 is respectively electrically connected with the cathodes of the amplitude limiting diodes D1 and D2, the resistor R1 and one end of the signal receiver W1 are electrically connected, a primary pin 2 of the intermediate frequency transformer T1 is respectively electrically connected with the anodes of the amplitude limiting diodes D1 and D2, the resistor R1 is electrically connected with the other end of the signal receiver W1, a secondary pin 3 of the intermediate frequency transformer T1 is electrically connected with the capacitor C1, one end of the resistor R2 is electrically connected with the impedance conversion module, a secondary pin 4 of the intermediate frequency transformer T1 is electrically connected with the capacitor C1, and the other end of the resistor R2 is electrically connected and grounded;

the second frequency-selective amplification module comprises a signal receiver W2, resistors R3, R4, clipping diodes D3, D4, an intermediate frequency transformer T2, a capacitor C2, a primary 1 of the intermediate frequency transformer T2 is electrically connected with the cathodes of the clipping diodes D3 and D4, the resistor R3 and one end of the signal receiver W2 are electrically connected, a primary 2 of the intermediate frequency transformer T2 is electrically connected with the anodes of the clipping diodes D3 and D4, the resistor R3 is electrically connected with the other end of the signal receiver W2, a secondary 3 pin of the intermediate frequency transformer T2 is electrically connected with the capacitor C2, one end of the resistor R4 is electrically connected with the impedance conversion module, a secondary 4 pin of the intermediate frequency transformer T2 is electrically connected with the capacitor C2, and the other end of the resistor R4 is electrically connected with the ground.

The impedance conversion module comprises capacitors C3, C4, C5, inductors L1, L2, capacitors C3 and C4, wherein one ends of the capacitors C3 and C4 are electrically connected with one ends of a resistor R2, the other ends of the capacitors C3 and C4 are connected with one ends of the inductors L1 and L2, the other end of the inductor L1 is grounded, the other end of the inductor L2 is respectively connected with one end of the resistor R4 and one end of the capacitor C5, and the other end of the capacitor C5 is grounded.

The utility model has the advantages that:

intermediate frequency transformer T1, T2 can carry out frequency selection and once enlargies to signal receiver W1, W2's small signal respectively, and the noise of discharging the certain limit within range, the signal processing in the impedance transformation module after the amplification is more accurate, and circuit structure is simple, and is reliable.

Drawings

Fig. 1 is a circuit schematic of an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1, the frequency-selective characteristic and impedance conversion communication circuit includes a first frequency-selective amplification module and a second frequency-selective amplification module, the first frequency-selective amplification module and the second frequency-selective amplification module are electrically connected with the impedance conversion module respectively, the intermediate frequency transformers T1 and T2 can perform frequency selection and primary amplification on small signals of the signal receivers W1 and W2 respectively, noise in a certain range is discharged, the amplified signals are more accurately processed in the impedance conversion module, and the circuit structure is simple and reliable;

Furthermore, the impedance transformation module comprises capacitors C3, C4, C5, inductors L1, L2, capacitors C3, and C4, wherein one end of each capacitor C3 and C4 is electrically connected with one end of a resistor R2, the other ends of the capacitors C3 and C4 are connected with one ends of inductors L1 and L2, the other end of the inductor L1 is grounded, the other end of the inductor L2 is respectively connected with one end of a resistor R4 and one end of a capacitor C5, and the other end of the capacitor C5 is grounded.

The above embodiments are merely preferred embodiments of the present invention, and other embodiments are also possible. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.

Claims

1. A frequency-selecting characteristic and impedance transformation communication circuit comprises a first frequency-selecting amplification module and a second frequency-selecting amplification module, and is characterized in that the first frequency-selecting amplification module and the second frequency-selecting amplification module are respectively electrically connected with an impedance transformation module;

the first frequency-selective amplification module comprises a signal receiver W1, resistors R1, R2, amplitude limiting diodes D1, D2, an intermediate frequency transformer T1 and a capacitor C1, wherein a primary pin 1 of the intermediate frequency transformer T1 is respectively electrically connected with the cathodes of the amplitude limiting diodes D1 and D2, the resistors R1 and one end of the signal receiver W1 are electrically connected, a primary pin 2 of the intermediate frequency transformer T1 is respectively electrically connected with the anodes of the amplitude limiting diodes D1 and D2, the resistors R1 and the other end of the signal receiver W1, a secondary pin 3 of the intermediate frequency transformer T1 is electrically connected with the capacitor C1, one end of the resistor R2 is electrically connected with the impedance conversion module, a secondary pin 4 of the intermediate frequency transformer T1 is electrically connected with the capacitor C1, and the other end of the resistor R2 is electrically connected and grounded;

the second frequency-selective amplification module comprises a signal receiver W2, resistors R3, R4, limiting diodes D3, D4, an intermediate frequency transformer T2 and a capacitor C2, wherein the primary 1 of the intermediate frequency transformer T2 is electrically connected with the cathodes of the limiting diodes D3 and D4, the resistor R3 and one end of the signal receiver W2, the primary 2 of the intermediate frequency transformer T2 is electrically connected with the anodes of the limiting diodes D3 and D4, the resistor R3 is electrically connected with the other end of the signal receiver W2, the secondary 3 pin of the intermediate frequency transformer T2 is electrically connected with the capacitor C2, one end of the resistor R4 is electrically connected with the impedance conversion module, the secondary 4 pin of the intermediate frequency transformer T2 is electrically connected with the capacitor C2, and the other end of the resistor R4 is electrically connected and grounded.

2. The frequency-selective characteristic and impedance transformation communication circuit according to claim 1, wherein: the impedance conversion module comprises capacitors C3, C4, C5, inductors L1 and L2, wherein one ends of the capacitors C3 and C4 are electrically connected with one end of a resistor R2, the other ends of the capacitors C3 and C4 are connected with one ends of the inductors L1 and L2, the other end of the inductor L1 is grounded, the other end of the inductor L2 is respectively connected with one end of the resistor R4 and one end of the capacitor C5, and the other end of the capacitor C5 is grounded.