Encoders are very common electronic components that can convert a rotating or linear position into a digital signal output. In the signal output of encoder, complementary output and push-pull output are two common forms. Here we introduce the difference between the two output methods.
Encoders are very common electronic components that can convert a rotating or linear position into a digital signal output. In the signal output of encoder, complementary output and push-pull output are two common forms. Here we introduce the difference between the two output methods.
First, complementary output
Complementary output means that the encoder provides both positive and inverse output signals at the same time. In this way, when the input signal changes, the positive and inverse output signals will show the characteristics of complementary changes. For example, when the input signal changes from low to high, the positive phase output changes from low to high, and the reverse phase output changes from high to low. These complementary relationships make the complementary output suitable for applications where further processing or transmission of the
input signal is required.
Two, push-pull output
Push-pull output refers to the encoder through two transistors (usually NPN type and PNP type) to achieve the conversion between the forward and reverse two states. In this way, when the input signal changes, only one transistor is in the on-state and the other is in the off state. For example, when the input signal changes from low level to high level, the NPN transistor is on and the PNP transistor is off; When the input signal changes from a high level to a low level, the PNP transistor is on and the NPN transistor is off. P
ush-pull output has better driving ability and noise suppression ability, when the need to directly drive the load or resist more interference noise applications are widely used.
In practical applications, encoders with complementary output or push-pull output must be selected according to actual needs. There is no obvious standard between good and bad, only a preference based
on the specific situation.
In summary, the complementary output is suitable for applications that require further processing or transmission of the input signal and do not require significant drive power or noise suppression. The push-pull output is suitable for applications where the load must be driven directly or where there is a
strong noise suppression requirement. The key to choosing which type of encoder is the practical application requirements and the tradeoff between driving capacity and noise suppression performance.
