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Class ab output stages and amplifiers including class ab output stages

A follower and buffer technology, which is applied in the direction of DC-coupled DC amplifiers, amplifiers, push-pull amplifiers, etc., can solve the problem that it is not easy to manufacture complementary process bipolar junction transistors

Inactive Publication Date: 2015-08-05
INTERSIL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Currently, the highest performance complementary bipolar processes such as silicon germanium BiCMOS processes cannot be readily used to fabricate complementary process bipolar junction transistors (i.e., both NPN and PNP) in bipolar processes in open market fabs

Method used

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  • Class ab output stages and amplifiers including class ab output stages
  • Class ab output stages and amplifiers including class ab output stages
  • Class ab output stages and amplifiers including class ab output stages

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Embodiment Construction

[0023] Certain embodiments of the present invention relate to fast, low distortion unity-gain voltage buffers implemented with NPN transistors without using any PNP transistors. figure 1 A class AB unity gain buffer 102 according to an embodiment of the present invention is shown, which is generally referred to simply as buffer 102 hereinafter. Such as figure 1 As shown, buffer 102 includes a flip voltage follower (FVF) 104 and an emitter follower 106 connected in parallel between a high voltage rail (Vcc) and a low voltage rail (Vee). Additionally, buffer 102 is shown to include bias generator 108 that provides a bias output to FVF 104 and emitter follower 106 .

[0024] FVF 104, sometimes referred to as a "white follower," is shown to include a pair of NPN transistors Q4 and Q5, with the collector of transistor Q5 connected (in one embodiment, via capacitor C19) to the base of transistor Q4. Resistor R9 is connected between the collector of transistor Q5 and the high vol...

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Abstract

A buffer stage includes a flipped voltage follower and an emitter follower. The flipped voltage follower is connected between a high voltage rail and a low voltage rail and include an input and an output. The emitter follower is also connected between the high voltage rail and the low voltage rail and includes an input and an output. A resistor connects the output of the flipped voltage follower to the output of the emitter follower. The input of the flipped voltage follower and the input of the emitter follower are connected together and provide an input of the buffer stage. The output of the emitter follower provides an output of the buffer stage. A differential buffer stage can be implemented using a pair of such buffer stages. Such a differential buffer stage can provide the output stage for a fully differential operational amplifier.

Description

[0001] priority statement [0002] This application claims priority to the following U.S. patent applications: [0003] Gwilym Francis Luff, entitled CLASS AB OUTPUT STAGES AND AMPLIFIERS INCLUDING CLASS AB OUTPUT STAGES (Class AB Output Stages and Amplifiers Including Class AB Output Stages), filed November 24, 2010 (Attorney Case No. ELAN- 01257US2) US Patent Application No. 12 / 954,169; [0004] Gwilym Francis Luff, entitled CLASS AB OUTPUT STAGES AND AMPLIFIERS INCLUDING CLASS AB OUTPUT STAGES (Class AB Output Stages and Amplifiers Including Class AB Output Stages), filed September 10, 2010, by Gwilym Francis Luff (Attorney Case No. ELAN- U.S. Provisional Application No. 61 / 381,881 of 01257US1); [0005] Gwilym Francis Luff, entitled CLASS AB OUTPUT STAGES AND AMPLIFIERS INCLUDING CLASS AB OUTPUT STAGES (Class AB Output Stages and Amplifiers Including Class AB Output Stages), filed June 15, 2010 (Attorney Case No. ELAN- 01257US0), U.S. Patent Application No. 61 / 355,026. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G1/04H03G3/00H03F3/45
CPCH03F3/505H03F2203/45394H03F3/45475H03F3/4508H03F2200/453H03F3/211H03F2203/45594H03F2203/45244H03F2203/45528H03F2200/405H03F3/45H03F3/26
Inventor G·F·卢弗
Owner INTERSIL INC