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Semiconductor circuit and method for reducing current variation in semiconductor circuit

A technology of semiconductors and circuits, applied in the field of semiconductor circuits that cause adverse effects due to changes, can solve the problems of not being able to meet the needs of low voltage, consuming voltage margins, etc.

Active Publication Date: 2012-02-01
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the above solutions will consume the voltage head room, so the above solutions cannot meet the low voltage requirements of the new CMOS processing technology

Method used

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  • Semiconductor circuit and method for reducing current variation in semiconductor circuit
  • Semiconductor circuit and method for reducing current variation in semiconductor circuit
  • Semiconductor circuit and method for reducing current variation in semiconductor circuit

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Embodiment Construction

[0018] In order to make the purpose, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings. The description of the present invention provides different examples to illustrate the technical features of different implementations of the present invention. Wherein, the configuration of each element in the embodiment is used to illustrate the present invention, but not to limit the present invention. In addition, part of the reference numerals in the embodiments are repeated for the purpose of simplifying the description, and do not imply the correlation between different embodiments.

[0019] Figure 4 is a schematic circuit diagram showing a semiconductor circuit according to an embodiment of the present invention. The semiconductor circuit 100 includes a master circuit 10 and a replica circuit 20 . The main circuit 10 is a differential amplifier (differenti am...

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Abstract

The invention discloses a semiconductor circuit and a method for alleviating current variation in the semiconductor circuit. Wherein the semiconductor circuit includes a main circuit and a copy circuit, and the main circuit receives an input signal. The main circuit includes: a first current source coupled between a node and a first power supply voltage, and generates a first current according to a bias voltage. The replica circuit is coupled to the main circuit, and is used for replicating the voltage variation at the node caused by the variation of the input signal, and dynamically adjusting the bias voltage according to the replicated voltage variation, so that the first current is maintained at a constant value. The semiconductor circuit and the method for alleviating the current variation in the semiconductor circuit provided by the invention can meet the low voltage requirement of the new complementary metal oxide semiconductor processing technology.

Description

technical field [0001] The present invention relates to a semiconductor circuit, and more particularly to a semiconductor circuit capable of alleviating adverse effects caused by fluctuations in received input signals. Background technique [0002] In most analog circuits, the current source is one of the most basic components that determine the performance of the overall circuit. Therefore, in analog circuits, a current source with a large output impedance is usually required. In a complementary metal-oxide-semiconductor circuit (CMOS), a simple current source such as figure 1 shown. The source and the gate of the NMOS transistor MA are respectively connected to a constant voltage, and the drain is an output node of the current source. Such a simple circuit cannot provide a large enough output impedance, and further, if figure 2 As shown, another NMOS transistor MB is cascaded to the current source (ie: MA), and the output impedance is increased by clamping the voltage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/46G05F1/56H03F3/14
Inventor 胡思全洪志谦
Owner MEDIATEK INC