source:Industry News release time:2022-08-09 Article author:yu Popular:pcb
First of all, the circuit board factory will first learn the basic points of the negative feedback amplifier circuit with you.
What is positive feedback? The feedback signal of positive feedback is in the same phase as our input signal. When doing addition, it is very easy to appear oscillation at this time.
What is negative feedback? Negative feedback is to ensure that our amplifying circuit can work normally within our operating range. The meaning of mining is that the feedback signal is opposite to the input signal of our amplifying circuit, and subtraction is performed.
Having said this, let's go back to our topic, let's take a look at what voltage feedback is.
The voltage feedback takes the voltage of the output signal from the output terminal of the amplifier to stabilize the voltage of the output signal.
Voltage feedback judgment: the output signal is cancelled, the feedback has no signal, whether the sampling point and the output terminal are at the same point, if it is the same point, it belongs to the voltage feedback, and the output terminal of the parallel circuit.
How to understand that the voltage feedback output resistance is small: it is beneficial to the parallel voltage to be equal everywhere, and the parallel resistance becomes smaller to understand.
Circuit board factory summary: The sampling element of the voltage feedback is a parallel output terminal, and the output resistance is small.
We see that the output terminal is fed back in parallel; it is concluded that it is voltage feedback, and the output signal is cancelled, and the feedback has no signal.
After reading what voltage feedback is, let's take a look at current feedback.
Current feedback: It is to collect the current of the signal at the output of our amplifier. We know that the current of the series resistance is equal everywhere, and the series resistance is equal to the sum of the resistances. We can use this to understand that the current feedback is that the feedback element is connected in series. The output of our feedback. Increase the resistance value of the output resistor. At the same time, the feedback sampled signal is not at the same endpoint as our output.
Look at the picture and talk: let's look at this, R is our load resistance.
The circuit board factory will take a look at it together with everyone. The sampling point of RF is different from the output terminal. It is connected in series with the sampling output resistor. When the output signal is cancelled, there is still a signal coming over (see that the endpoint is a negative signal).
Circuit board factory summary: Voltage and current feedback look at the output of the amplifier, voltage feedback reduces the output resistance, and current feedback increases the output resistance.
Voltage feedback can stabilize the output voltage, reduce the output resistance, and improve the driving load capacity.
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