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Several common performance indexes of gigabit network transformer



Network transformer CMRR common mode rejection ratio: in a network system, in order to illustrate the ability of differential amplification circuit to suppress common mode signal and amplify differential mode signal, common mode rejection ratio is commonly used as a technical index to measure. It is defined as the ratio of voltage amplification ratio aud of amplifier to differential mode signal and voltage amplification ratio AUC of common mode signal, which is called common mode rejection ratio Rejection ratio, therefore, is generally represented by the abbreviation CMRR. The symbol is Kcmr, and the unit is dB

The larger the differential mode signal voltage amplification factor aud is, the smaller the common mode signal voltage amplification factor AUC is, the larger the CMRR is. At this time, the stronger the ability of the differential amplifier to suppress the common mode signal, the better the performance of the amplifier. When the differential amplifying circuit is completely symmetrical, the common mode signal voltage amplification factor AUC = 0, then the common mode rejection ratio CMRR →∞, which is an ideal situation, in fact, the circuit is completely symmetrical, and the common mode rejection ratio cannot be infinite.

Insertion loss, as small as possible

Insertion loss refers to the loss of load power due to the insertion of components or devices in the transmission system. The micro RJ45 connector represents the ratio of the power received on the load before the insertion of the component or device to the power received on the same load after the insertion in decibels

1. Insertion loss refers to the signal loss generated by inserting cables or elements between transmitter and receiver. Micro RJ45 band filter usually refers to attenuation. The insertion loss is expressed in dB of the received signal level.

2. Insertion loss refers to the loss of power, and attenuation refers to the decrease of signal voltage amplitude relative to the original signal amplitude of the circuit measuring insertion loss

The insertion loss of the channel refers to the ratio of the output optical power of the output port to the input optical power of the input port, in dB. The insertion loss is related to the input wavelength and the switch state. Defined as: Il = - 10log (PO / PI)

Return loss, the greater the better

Return loss, also known as reflection loss. The price of micro RJ45 band filter is the reflection of cable link due to impedance mismatch, which is the reflection of a pair of lines themselves. Mismatch mainly occurs in the connector, but it may also occur in the cable where the characteristic impedance changes, so the construction quality is the key to improve the return loss. The return loss will lead to the fluctuation of the signal, and the returned signal will be confused by the double gigabit network as the received signal

Return loss. Return loss is a parameter that represents the reflection performance of a signal. Return loss indicates that part of the incident power is reflected back to the signal source. For example, if 1MW (0dbm) power is injected into the amplifier and 10% of it is reflected (bounced back), the return loss is - 10dB. Mathematically, the return loss is - 10 LG [(reflected power) / (incident power)]. Return loss is usually specified in both input and output


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