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How to judge the single-ended double-ended circuit diagramThe following methods can be used to determine the single-ended and double-ended circuit diagrams:
** I. Judgment of Single-Ended and Double-Ended Inputs in the Different Amplification Circuit **
1. ** Single-ended input **
- In terms of circuit structure, the single-ended input differential amplifier circuit structure was relatively simple. It usually consisted of two transistors, one of which was used as the input terminal and the other as the reference terminal. The input side of the input terminal receives the input signal, and the reference side of the reference terminal receives a fixed reference voltage.
- Signal input features: only one input is used to receive the input signal. The signal is added between one input and the ground, and the other input is grounded.
2. ** Double-ended input **
- Circuit structure: There are two input ports in the circuit, and the signal is applied to both input ports at the same time.
- Working state: For a double-ended input and double-ended output differential amplifier circuit, for example, when analyzing the working state of the circuit, such as the emitter-biased differential amplifier circuit, when the double-ended input, the base of the two tubes have signal input and are mutually related to affect the working state of the circuit.
** 2. Single-ended and double-ended judgment ideas in other circuits (such as high-voltage switch ground connection, USB related circuits, etc.)**
1. ** Judgment of Earthing Condition (Take the High Pressure Switch as an example)**
- Double-ended grounded: In a high-voltage switch circuit, if you see that both ends of the high-voltage switch are grounded, a low-resistance circuit is formed. This is a characteristic of double-ended grounded. In this case, it can be judged as a double-ended situation according to the number of ground ends and the connection method.
- Single-ended ground: If only one end is grounded (assuming that the A end is grounded, the B end is not grounded and there are other connections), it can be judged as a single-ended ground situation, which is obviously different from the double-ended ground connection.
2. **USB related circuit (Take USB-C interface circuit as an example)**
- Dual-terminal characteristic: In some USB-C interface-related circuits, if the circuit operates from both ends of the interface in terms of data transmission and charging functions, for example, some chips support two-way communication (like PD3.1 communication, where information is exchanged from both ends of the interface), it can be regarded as having a double-terminal characteristic.
- Single-ended characteristic: If the circuit function is mainly to perform signal transmission or charging operations from one end of the USB-C interface, for example, the signal is only input or output from a certain pin of the interface, it can be considered a single-ended characteristic.
3. ** Power supply related circuit (Take the Pulse Circuit Controller as an example)**
- Dual-ended: For dual-ended voltage and current mode pulse width shifter controllers like the IL6740 and IL6741, when designed for various power conversion applications, if it is for half-bridge, full-bridge and other situations that require voltage or current control from both ends of the circuit, this characteristic of control from both ends of the circuit can be used as a basis for double-ended judgment.
- Single-ended: If the control of voltage or current, signal input, etc. in the power-related circuit is mainly operated from one end of the circuit, for example, only from the input end or output end of the power circuit, it can be judged as a single-ended situation.
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