Low-offset high-speed fully differential amplification device
A fully differential amplification and fully differential amplifier technology, which is applied in the direction of differential amplifiers, components of amplifying devices, amplifiers, etc., can solve the problems of reducing system integration and increasing system costs, so as to increase integration, optimize noise characteristics, reduce The effect of small capacitor values
Inactive Publication Date: 2019-10-18
XIDIAN UNIV
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Problems solved by technology
But this solution reduces the integration of the system and greatly increases the cost of the system
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[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the examples of the present invention will be further described in detail below in conjunction with the examples and accompanying drawings.
[0024] see figure 1 , the present invention includes a fully differential amplifier circuit 1 and a feedback circuit 2 formed by cascading four fully differential amplifiers. Among them, the fully differential amplifier circuit 1 composed of four cascaded cascades is composed of four fully differential amplifiers A1, A2, A3 and A4, and the direct coupling connection between the stages is used to achieve high gain and high bandwidth; the feedback circuit 2 is connected to Between the output terminal of the fourth-stage fully differential amplifier A4 and the input terminal of the first-stage fully differential amplifier A1, it is used to feed back the low-frequency signal of the entire device to the input terminal; ...
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The invention discloses a low-offset high-speed fully differential amplification device applied to a high-speed interface system, and mainly solves the problems of high cost and low system integrationlevel in the prior art. The circuit comprises a four-stage cascaded fully differential amplifier and a low-frequency feedback circuit, the low-frequency feedback circuit is connected between the output end of the fourth stage and the input end of the first stage and used for detecting a low-frequency component of a fully differential amplifier output end signal, and the component is converted into current to be fed back to the input end; the low-frequency offset voltage of the amplifier is reduced, and the circuit is formed by cascading a two-stage feedback amplifier AF1, a two-stage feedbackamplifier AF2 and a transconductance amplifier GF3, a first Miller capacitor Cm1 is connected between the positive input end and the negative output end of the second-stage feedback amplifier AF2, and a second Miller capacitor Cm2 is connected between the negative input end and the positive output end of the second-stage feedback amplifier AF2, the offset voltage and the cost are reduced, the system integration degree is improved, and the high-speed analog equalization circuit can be used for a high-speed analog equalization system.
Description
technical field [0001] The invention belongs to the technical field of microelectronic integrated circuits, and in particular relates to a full differential amplifier, which can be applied to high-speed analog equalization systems. Background technique [0002] In front-end amplification of radio frequency systems and high-speed analog equalization systems, high-speed and high-precision fully differential amplifiers are often required. In order to improve the gain and bandwidth of the amplifier, multi-stage cascading is usually used in the circuit design, and the size of the devices on the signal path is minimized to achieve the purpose of reducing the parasitic capacitance, but this inevitably increases the DC of the circuit. offset voltage. [0003] An existing technology to solve the above problems is to add an offset cancellation circuit to the circuit. The principle of this technology is to reduce the DC offset voltage of the circuit without affecting the high frequenc...
Claims
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Login to View More IPC IPC(8): H03F1/14H03F1/26H03F3/193H03F3/45
CPCH03F1/14H03F1/26H03F3/193H03F3/45179H03F2200/451H03F2200/372H03F2203/45032
Inventor 刘红侠吴红兵韩涛
Owner XIDIAN UNIV