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Differential amplifier using body-source cross coupling

A differential amplifier and cross-coupling technology, used in differential amplifiers, DC-coupled DC amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as low potential and reduce transistor breakdown voltage, and achieve increased gain, The effect of alleviating the reduction in breakdown voltage

Inactive Publication Date: 2012-03-21
KOREA ADVANCED INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this differential amplifier, the body effect increases the gain of the common-gate amplifier but reduces the breakdown voltage of the transistor because the potential of the body is lower than that of the source

Method used

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  • Differential amplifier using body-source cross coupling
  • Differential amplifier using body-source cross coupling
  • Differential amplifier using body-source cross coupling

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Embodiment Construction

[0031] The invention is described in more detail below with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. It should be understood that the following embodiments are disclosed for illustrative purposes only. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[0032] Figure 4 and Figure 5 To show a circuit diagram of a differential amplifier using body-source cross-coupling according to the present invention, NMOSFETs and PMOSFETs are used respectively.

[0033] As shown, the bulk of the common-gate amplifier is cross-coupled to the source of the opposing common-gate amplifier.

[0034] In this differential structure, the common gates 47 and 57 form a virtual ground, and a DC offset is provided to the gates to form an offset circuit. Supply the source terminals 43, 44, 53 and 54 of NMOSFET and PMOSFET as Figure 6 The current sources 103 and...

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PUM

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Abstract

Disclosed herein is a differential amplifier using body-source cross coupling. In a common gate differential amplifier in which common gate amplifiers are implemented in a differential structure, since the bodies of the common gate amplifiers are cross coupled to the sources of the opposite common gate amplifiers, it is possible to increase transconductance due to body effect to improve a gain. Since the potential of the body is equal to that of the source in a DC mode, a breakdown voltage reduction problem is alleviated.

Description

technical field [0001] The present invention relates to a differential amplifier using body-source cross-coupling (body-source cross-coupling), and more particularly to a body-source cross-coupling in a common-gate differential amplifier in which a common-gate amplifier is implemented in a differential structure through cross-coupling and the body and source, thereby using a body-source cross-coupled differential amplifier capable of increasing transconductance due to the body effect to increase gain and suppress a decrease in breakdown voltage. Background technique [0002] Figure 1 and Figure 2 are circuit diagrams showing conventional common-gate differential amplifiers using NMOSFETs and PMOSFETs, respectively. [0003] As shown, in a differential configuration, the common gates 9 and 29 form a virtual ground and a DC voltage is supplied to the gates to form an offset circuit. Current sources 3 , 4 , 23 and 24 are provided to source terminals 5 , 6 , 25 and 26 of the MO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L29/40H01L29/78H03F1/52H03F1/02H03F3/45
CPCH03F2203/45318H03F1/523H03F3/45179H03F1/52H03F2203/45026H03F2203/45306H03F2203/45352H03F2203/45342H03F3/45188H03F2203/45018H03F3/45H03F1/22
Inventor 洪圣喆李东镐
Owner KOREA ADVANCED INST OF SCI & TECH