Virtual source earth voltage generating circuit
A voltage generation circuit, a technology for generating circuits, applied in electrical components, regulating electrical variables, instruments, etc., can solve problems such as inability to provide voltage, inability to provide source voltage and ground voltage at the same time, poor output voltage stability, etc.
Active Publication Date: 2012-07-25
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology
If the source voltage Vdd is small, and the conduction voltage V of P4 TP4 higher, the Vdd-V TP4 less than the turn-on voltage V of N6 TN6 When N6 is off, the output of N6 may be high, but cannot provide ground voltage '0'
It can be seen that the traditional ground voltage circuit also has obvious limitations, which requires a higher source voltage Vdd and the conduction voltage V of the feedback transistor P4 TP4 smaller
[0005] It can be seen from the above that no matter the source voltage generating circuit or the ground voltage generating circuit, there are defects that have high requirements on the turn-on voltage and source voltage of the feedback transistor, the stability of the output voltage is poor, and the source voltage and the source voltage cannot be provided at the same time. ground voltage
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[0028] For the defects of the virtual source voltage or ground voltage generation circuit mentioned above, such as image 3 As shown, the present invention provides a virtual source ground voltage generation circuit, which includes a high and low voltage generation circuit 1 and a separation circuit 2 . Wherein, the high voltage and the low voltage output the high voltage and the low voltage to the separation circuit, and the separation circuit can separate the high voltage and the low voltage to generate a source voltage or a ground voltage, or generate a source voltage and a ground voltage.
[0029] Such as Figure 4 As shown, the high and low voltage generation circuit 1 is specifically composed of two inverters with opposite polarities connected in parallel. According to the output characteristics of the inverter circuit, it can generate two voltages V1 and V2, one of which is a high voltage and the other is a low voltage. . However, since it is impossible to distinguish...
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The invention discloses a virtual source earth voltage generating circuit, comprising a high and low voltage generating circuit and a separation circuit, wherein the high and low voltage generating circuit consists of two inverter circuits with different polarities connected in parallel and can generate a high voltage and a low voltage; and the separation circuit can output the source voltage or the earth voltage according to the input high voltage and the low voltage. By adopting the virtual source earth voltage circuit, as the high and low voltage generating circuit consists of two invertercircuits, the value range of the source voltage (Vdd) is larger, and the source voltage and earth voltage with high stability can be output simultaneously in combination with the output characteristic of the separation circuit.
Description
technical field [0001] The invention relates to the field of integrated circuit manufacturing, in particular to a virtual source-ground voltage generating circuit. Background technique [0002] In semiconductor integrated circuit chip design, integrated circuit chips often reserve some pins for functional improvement in subsequent stages. However, in order to ensure the normal operation or stability of the chip, it is usually necessary to give these reserved pins a fixed voltage, such as a source voltage or a ground voltage. However, in practical applications, if an actual voltage or ground is applied to the reserved pins of the integrated circuit chip, it will cause electrostatic discharge and damage the chip. Therefore, it is usually necessary to use a virtual source voltage generating circuit and a ground voltage generating circuit to respectively provide the source voltage and the ground voltage to the reserved pins of the chip. [0003] As shown in Figure 1, the tradi...
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IPC IPC(8): H02M3/158
Inventor 杨光军
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP