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Source or emitter follower buffer circuit and method

A buffer circuit, emitter follower technology, used in amplifiers with impedance circuits, electrical components, amplifiers with semiconductor devices/discharge tubes, etc.

Inactive Publication Date: 2012-10-17
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, there is a need to reduce distortion and improve linearity, but at the same time provide a high impedance load

Method used

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  • Source or emitter follower buffer circuit and method
  • Source or emitter follower buffer circuit and method
  • Source or emitter follower buffer circuit and method

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Embodiment Construction

[0045] In one aspect, the invention proposes a buffer circuit comprising a source or emitter follower input stage and an output stage. A load is placed between the stages, the load comprising a reproduction of the output load of the buffer circuit. This improves the linearity of the circuit while enabling high input impedance. In another aspect, the buffer circuit includes a source or emitter follower output stage. The loading is in the form of a filter and includes a reproduction of the output loading of the buffer circuit. This enables compensation of current through more complex output loads, improving linearity for a wide range of applications.

[0046] figure 1 A basic source / emitter follower circuit is shown.

[0047] Transistor 10 is a BJT in the case of an emitter follower and a FET in the case of a source follower. The circuit input 12 is applied to the base / gate and the collector / drain is connected to the high voltage rail VCC. The emitter / source is coupled to ...

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Abstract

In one aspect, a buffer circuit comprises a source or emitter follower input stage and output stage. A load is provided between the stages which comprises a representation of an output load of the buffer circuit. This improves the circuit linearity whilst enabling a high input impedance to be obtained. In another aspect, a buffer circuit comprises a source or emitter follower output stage. A load is in the form of a filter is provided and which comprises a representation of an output load of the buffer circuit.

Description

technical field [0001] The present invention relates to source or emitter follower circuits. Background technique [0002] A source follower is a basic FET-based amplifier structure, also known as a common-drain amplifier. An emitter follower is a basic BJT-based amplifier structure, also known as a common-collector amplifier. These circuits are typically used as voltage buffers, for example with unity voltage gain and near infinite current gain. [0003] A source / emitter follower stage is a type of snubber circuit used in many analog circuits. The key parameter is its ability to drive low impedance loads without signal distortion while operating at low bias currents. [0004] Specifically, a source / emitter follower stage is used as a driver circuit for a capacitor-based high-speed switching analog-to-digital converter. [0005] The snubber circuit needs to have a transfer function as linear as possible. [0006] US2009 / 0315594 discloses a circuit topology that includes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/50
CPCH03F1/083H03F3/00H03F3/505H03F1/086
Inventor 赫夫·马里耶里昂内尔·古依拉德
Owner NXP BV
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