High-frequency high-linearity input buffer and high-frequency high-linearity input buffer differential circuit
An input buffer, differential circuit technology, applied in logic circuits, logic circuit connection/interface layout, amplifiers with semiconductor devices/discharge tubes, etc. The effect of output linearity, improving input linearity, and improving performance indicators
Active Publication Date: 2021-01-22
CHENGDU SINO MICROELECTRONICS TECH CO LTD
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Problems solved by technology
[0009] The existing technology only solves the deterioration of linearity caused by the second point, but neither the first nor the third point can be effectively solved
Method used
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[0031] see Figure 1 ~ Figure 3 .
[0032] For NMOS transistors, the source terminal is the current output terminal, and the drain terminal is the current input terminal.
[0033] For a PMOS transistor, the source terminal is the current input terminal, and the drain terminal is the current output terminal.
[0034] As an implementation, figure 1 A high-frequency high-linearity input buffer is shown, including a signal translation unit LS and three NMOS transistors: a first MOS transistor M1 , a second MOS transistor M2 and a third MOS transistor M3 .
[0035] The gate terminal of the first MOS transistor M1 is used as the input terminal of the buffer, and the current output terminal of the first MOS transistor M1 is used as the output terminal of the buffer;
[0036] The current input end of the first MOS tube is connected to the current output end of the second MOS tube, the current output end of the first MOS tube is connected to the current input end of the third MOS tu...
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The invention discloses a high-frequency high-linearity input buffer and a high-frequency high-linearity input buffer differential circuit, and relates to the integrated circuit technology. The high-frequency high-linearity input buffer comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a signal translation unit, the gate end of the first MOS transistor serves asthe input end of the buffer, and the current output end of the first MOS transistor serves as the output end of the buffer; the current input end of the first MOS tube is connected with the current output end of the second MOS tube, the current output end of the first MOS tube is connected with the current input end of the third MOS tube, the current input end of the second MOS tube is connectedwith the gate end of the third MOS tube, the input end of the signal translation unit is connected with the input end of the buffer, and the output end of the signal translation unit is connected withthe gate end of the second MOS tube. The output end of the third MOS tube is grounded, and the current input end of the second MOS tube is connected with the active bias current circuit. According tothe invention, the input linearity and the output linearity are effectively improved.
Description
technical field [0001] The present invention relates to integrated circuit technology. Background technique [0002] Currently, one of the most challenging and difficult modules for high-speed and high-precision analog-to-digital converters is the front-end high-speed and high-linearity input buffer. Representative companies in the field of converters include ADI and TI in the United States, both of which have their own high-speed and high-linearity input buffers. And generally the main circuit adopts an open-loop source-following structure. The high-speed and high-linear input buffer is one of the core and most critical modules of the high-speed and high-precision analog-to-digital converter, and it is also the most challenging and difficult module to design. At present, in the world, only ADI and TI in the United States have mastered the design technology of a series of high-speed and high-linear input buffers, and have been applied to a variety of high-speed and high-pr...
Claims
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IPC IPC(8): H03K19/0185
CPCH03K19/0185H03K19/018528H03F3/505H03F3/45179H03F3/45192H03K19/018578H03K19/0948
Inventor 杨金达岑远军罗建
Owner CHENGDU SINO MICROELECTRONICS TECH CO LTD