A driving amplifier and an analog-to-digital converter
A technology for driving amplifiers and analog-to-digital converters, which is applied in the directions of analog-to-digital converters, analog-to-digital conversions, and differential amplifiers. It can solve the problems of high speed, high linearity, low noise, and wide swing at the same time. The effect of short channel effect, controllable overall noise, and simple circuit structure
Active Publication Date: 2020-09-11
MICROTERA SEMICON (GUANGZHOU) CO LTD
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Problems solved by technology
[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a driving amplifier and an analog-to-digital converter, which is used to solve the problem that the existing driving amplifier cannot simultaneously satisfy high speed, high linearity, low noise, Wide swing and other issues
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[0021] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0022] see figure 1 and figure 2 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic concept of the present invention, although only the components related to the present invention are shown in the diagrams rather than the number, shape and Dimensional drawing, the shape, quantity and proportion of each component can be changed arbitrarily during actual implementation, an...
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The present invention provides a driving amplifier and an analog-to-digital converter. The driving amplifier includes: a first-stage source follower, a second-stage source follower connected to the output end of the first-stage source follower, and a second-stage source follower connected to the The feedback unit of the first-stage source follower and the second-stage source follower; wherein, the first-stage source follower is used to drive and enhance the input signal to drive the second-stage source follower; the second-stage source follower; The second-stage source follower is used to drive and enhance the output signal of the first-stage source follower under the drive of the first-stage source follower; The output of the follower dynamically adjusts the drain terminal voltage of the PMOS input transistor in the first-stage source follower to stabilize the DC operating point of the PMOS input transistor. The present invention solves the problems that the existing drive amplifier cannot satisfy high speed, high linearity, low noise, wide swing and the like when driving a large capacitor.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a driving amplifier and an analog-to-digital converter. Background technique [0002] As people measure the physical world more and more widely and the measurement accuracy becomes more and more precise, the application of analog-to-digital converters (Analog to digital Converter, ADC) is increasing, and the requirements for the accuracy and speed of ADC are increasing. High, which poses a challenge to the design of the ADC. The actual work of the ADC can be divided into two stages according to the chronological order of the work: the first stage is sampling, and the analog signal to be converted is accurately sampled to the capacitor and held; the second stage is conversion, and the sample obtained in the first stage is The analog signal is quantized, converted into a digital signal and output; therefore, if the ADC output is to meet the high-precision requirements, it is nec...
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IPC IPC(8): H03F3/45H03M1/12
CPCH03F3/45H03M1/12H03M1/1245
Inventor 刘森李建平刘海彬刘兴龙史林森张均安
Owner MICROTERA SEMICON (GUANGZHOU) CO LTD