Gate voltage bootstrap switching circuit

Abstract

The present invention discloses a gate voltage bootstrap switching circuit. The gate voltage bootstrap switching circuit comprises a sampling switching tube M1, a first NMOS tube M2, a second NMOS tube M3, a first PMOS tube M4, a second PMOS tube M5, a third NMOS tube M6, a fourth NMOS tube M7, a third PMOS tube M8, a fourth PMOS tube M9, a fifth NMOS tube M10, a sixth NMOS tube M11, a fifth PMOS tube M12, a sixth PMOS tube M13, a seventh PMOS tube M14, a seventh NMOS tube, an eighth NMOS tube M16, a first capacitor C1, a bootstrap capacitor Cb and a load capacitor Cs; according to the invention, the sampling switch tube M1, the first NMOS tube M2 and the second PMOS tube M5 are conducted more quickly, and the conduction resistance of the sampling switch tube M1, the first NMOS tube M2 and the second PMOS tube M5 is reduced; and the connection between the sampling switch tube M1 and the plurality of MOS tubes is cut off, so that the parasitic capacitance is obviously reduced, and the bandwidth of the sampling switch is improved.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, has the characteristics of fast speed and high linearity, and can be used in high-speed and high-linearity sampling and holding circuits. Background technique [0002] The digital signal processing system has excellent performance that cannot be compared with the analog system. In order to convert the signal into the digital domain for more refined processing and analysis, the analog-to-digital converter (Analog-to-Digital Converter, referred to as ADC) acts as a bridge to connect the digital world and simulated worlds. Sampling the input signal is the first step of the ADC, so any high-speed and high-precision ADC is inseparable from a high-performance sample-and-hold circuit. As an important part of the sample and hold circuit, the performance of the sampling switch determines the performance of the entire sample and hold circuit. [0003] The performance of the sample-and-hold circu...

AI Technical Summary

Problems solved by technology

[0007] The existing grid voltage bootstrap switching circuit reduces the influence of the gate-source voltage variation of the sampling switch on the on-resistance, but since the substrate of the sampling switch M1 is grounded, its on-resistance will still be affected by the substrate bias effect On the other hand, the sampling switch M1 and the NMOS tube M2 will not be turned on until the gate voltage is large enough, which greatly increases the conduction time of the sampling switch. A MOS tube connection, which brings a large parasitic capacitance, which limits the bandwidth of the sampling switch

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