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Reference buffer

A buffer and device-level technology, applied in the field of closed-loop reference buffers, can solve the problems of low noise, high gain and low power consumption of reference buffers

Inactive Publication Date: 2009-08-12
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the reference buffer cannot have the performance of low noise, high gain and low power consumption at the same time, the present invention proposes the following technical solutions:

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Embodiment Construction

[0016] Certain terms are used in the description and claims to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Include" mentioned throughout the description and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that the first device is coupled to the second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0017] image 3 is a schematic diagram of an embodiment o...

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Abstract

A reference buffer is disclosed. The reference buffer includes a main source follower stage, a replica source follower stage, and a low-pass filter. The main source follower stage provides a first main voltage according to a first driving voltage. The replica source follower stage duplicates the first main voltage to generate a first reference voltage. The low-pass filter is coupled between the main source follower stage and the replica source follower stage.

Description

technical field [0001] The present invention relates to a reference buffer, in particular to a closed-loop reference buffer. Background technique [0002] Operational amplifier (operational amplifier, OP-AMP) can be said to be the most widely used and most functional integrated circuit (Integrated Circuit, IC) in analog circuits. OP-AMP is mainly used in linear circuits, that is, the amplification of analog signals (such as sound signals, temperature signals, pressure signals, speed signals or sine wave signals, etc.). Figure 1A is a schematic diagram of OP-AMP. As shown in the figure, OP-AMP10 includes two power terminals, one output terminal, one non-inverting input terminal (+), and one inverting input terminal (-). In order to simplify the diagram, two power terminals are often omitted in general circuits, such as Figure 1B shown. [0003] Most OP-AMP applications have negative feedback. The so-called negative feedback means that there is a resistance or capacitanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/34H03F1/26H03F1/02
CPCH03F3/505H03F2200/453H03F2203/5036G05F1/575
Inventor 林育信廖学坤
Owner MEDIATEK INC
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