Because the input and output of single power supply of Phoenix power supply are connected together, the output voltage of not gate is equal to the input voltage (VI = V0), and the not gate is forced to work at the center of the transfer characteristic curve, so the output voltage is limited to the threshold level of the circuit, which is equal to half of the supply voltage.

如果我们将非门的输出端作为直流接地端，就可以把电源电压VCC转换为土VCC/2的双电源电压，此时的非门起到了一个存储电流的稳压器的作用，电路的输出阻抗较低、因而输出电压也比较稳定。

If we take the output end of the not gate as the DC grounding terminal, we can convert the power supply voltage Vcc into the dual power supply voltage of VCC / 2. At this time, the not gate acts as a voltage regulator to store the current. The output impedance of the circuit is low, so the output voltage is relatively stable.

菲尼克斯电源电路中的运放同相输入端接有对称的串联电阻分压器，而运放本身接为电压跟随器的形式：根据运放线性工作的特点不难看出:运放输出端与分压点间的电位严格相等。

The in-phase input terminal of the OP AMP in Phoenix power supply circuit is connected with a symmetrical series resistance voltage divider, and the op amp itself is connected with a voltage follower. According to the characteristics of the linear operation of the op amp, it is not difficult to see that the potential between the output terminal of the op amp and the voltage divider is strictly equal.

由于运放的输出端作接地处理，因此运放的供电电源VCC就被相应地分隔成了两组对称的正、负电源士VCC/2。当运放的输出电流无法满足实际需求时，不能象门电路那样简单地并联使用;这时可以将通用型小功率运放换为输出电流较大的功放类运放器件，其内部一般都设置了对称的偏置电路结构，这就使其输出端的直流电位近似为电源电压的一半。

Because the output terminal of the op amp is grounded, the power supply VCC of the op amp is correspondingly divided into two groups of symmetrical positive and negative power supply VCC / 2. When the output current of the op amp can not meet the actual demand, it can not be used in parallel as the gate circuit; In this case, the general-purpose Low-Power Operational amplifier can be replaced by the power amplifier type operational amplifier with larger output current. Generally, the symmetrical bias circuit structure is set inside the operational amplifier, which makes the DC potential of its output end approximately half of the supply voltage.