Improved compact CMOS (Complementary Metal-Oxide-Semiconductor Transistor) voltage stabilizing circuit

Abstract

The invention provides an improved compact CMOS (Complementary Metal-Oxide-Semiconductor Transistor) voltage stabilizing circuit. The improved compact CMOS voltage stabilizing circuit comprises a first N-type MOS (Metal Oxide Semiconductor) transistor MN0, a second N-type MOS transistor MN1, a third N-type MOS transistor MN3, a fourth N-type MOS transistor MN4, a fifth N-type MOS transistor MN5, a first P-type MOS transistor MP0 and a second P-type MOS transistor MP1. The circuit only comprises the MOS transistors, and has the characteristics of low power consumption and small area; compared with a general filtering stabilizing circuit based on an on-chip capacitor, the improved compact CMOS voltage stabilizing circuit has higher practicability and achieves the effect of stabilizing voltage by increasing the power supply rejection ratio of the circuit.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an improved compact CMOS voltage stabilizing circuit. Background technique [0002] In the past, the operating frequency of integrated circuits was low, and the signal fluctuations caused by packaging had little impact on the circuit; later, the operating frequency of integrated circuits has increased, and the influence of signal fluctuations caused by packaging on the circuit has increased. At this time, some More common methods to solve it, such as using capacitor filtering, etc.; but as the operating frequency of integrated circuits becomes higher and higher, the impact of signal fluctuations caused by packaging on the circuit is also increasing. For example, in a capacitive SAR structure ADC, the switch The circuit controls the capacitor to charge and discharge, and the reference voltage for charging the capacitor fluctuates greatly, which will cause a large loss in the per...

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Problems solved by technology

[0002] In the past, the operating frequency of integrated circuits was low, and the signal fluctuations caused by packaging had little impact on the circuit; later, the operating frequency of integrated circuits has increased, and the influence of signal fluctuations caused by packaging on the circuit has increased. At this time, some More common methods to solve it, such as using capacitor filtering, etc.; but as the operating frequency of integrated circuits becomes higher and higher, the impact of signal fluctuations caused by packaging on the circuit is also increasing. For example, in a capacitive SAR structure ADC, the switch The circuit controls the capacitor to charge and discharge, and the reference voltage for charging the capacitor fluctuates greatly, so the performance of the entire circuit will suffer a large loss, and the effective number of digits will also drop significantly.

[0003] The classic method of voltage filtering and stabilizing voltage is to add a larger capacitor at the output end of the voltage. The higher the operating frequency of the circuit, the more stable the voltage requirement, and the larger the capacitor will be; while the large-capacity capacitor in the CMOS process generally uses an on-chip metal capacitor Realization, its area is relatively large, if according to the design method of the classic capacitor filter, its area even exceeds the entire chip, and different types and sizes of capacitors must be selected according to different operating frequencies; therefore, at high frequencies, the CMOS circuit is only The cost of voltage stabilization using capacitors is unacceptable, if not impossible

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