The difference between the circuit VCC, VDD, VEE, VSS
In circuit design and PCB fabrication, the power symbols are often encountered: VCC, VDD, VEE, VSS. What kind of relationship do they have?
VCC: C=circuit indicates the meaning of the circuit, that is, the voltage of the access circuit.
VDD: D = device means the meaning of the device, that is, the operating voltage inside the device;
VSS: S=series means the meaning of a common connection, usually refers to the common ground voltage of the circuit
Second, the description
1. For digital circuits, VCC is the supply voltage of the circuit, VDD is the operating voltage of the chip (usually Vcc>Vdd), and VSS is the ground point.
2. Some ICs have both VDD and VCC pins, indicating that the device itself has a voltage conversion function.
3. In a FET (or COMS device), VDD is the drain, VSS is the source, and VDD and VSS refer to the component pins, not the supply voltage. DSP communication network DSP learning first forum DSP technology application and promotion platform DSP development service platform
4, in general, VCC = analog power, VDD = digital power, VSS = digital ground, VEE = negative power
Vcc and Vdd are the power terminals of the device. Vcc is positive for bipolar devices, and Vdd is mostly positive for single-stage devices. The subscript can be understood as the collector C of the NPN transistor and the drain D of the PMOS or NMOS FET. You can also see Vee and Vss in the circuit diagram, which has the same meaning. Since the mainstream chip structure is silicon NPN, Vcc is usually positive. If VNP is used, the PNP structure is negative. When selecting a chip, be sure to look at the electrical parameters.
Vcc is derived from collector supply voltage, Collector Voltage, generally used for bipolar transistors, PNP tube is negative supply voltage, sometimes labeled as -Vcc, NPN tube is positive voltage. DSP AC network DSP learning first forum
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Vdd is derived from the drain supply voltage, Drain Voltage, used in MOS transistor circuits, generally referred to as the positive supply. Because it is rarely used alone.
PMOS transistor, so in CMOS circuits, Vdd is often connected to the source of the PMOS transistor.
Vss source supply voltage, referred to as negative supply in CMOS circuits, or zero volts or grounded in single supply.
Vee emitter power supply voltage, Emitter Voltage, is generally used for the negative supply voltage of the ECL circuit.
Vbb base supply voltage, common-base circuit for bipolar transistors. DSP communication network DSP learning first forum DSP technology application and promotion platform DSP development service platform
Interpretation in the circuit: DSP communication network DSP learning first forum DSP technology application and promotion platform DSP development service platform
VDD: supply voltage (unipolar device); supply voltage (4000 series digital
Road); drain voltage (field effect transistor)
VCC: power supply voltage (bipolar device); power supply voltage (74 series digital circuit); voice control carrier (Voice Controlled Carrier)
VSS:: ground or negative power supply
VEE: negative voltage supply; source of field effect transistor (S)
VPP: Program/erase voltage.
In an electronic circuit, VCC is the supply voltage of the circuit, and VDD is the operating voltage of the chip:
VCC: C=circuit indicates the meaning of the circuit, that is, the voltage of the access circuit, D=device indicates the meaning of the device, that is, the working voltage inside the device. In ordinary electronic circuits, generally Vcc>Vdd!
VSS: S=series means the meaning of a public connection, that is, the negative pole.
Some ICs have both VCC and VDD, and this device has a voltage conversion function.
In the "field effect" or COMS component, VDD is the drain pin of CMOS, and VSS is the source pin of CMOS.
This is the component pin symbol, it has no "VCC" name, your problem contains 3 symbols, VCC / VDD / VSS, which is obviously the circuit symbol.