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Amplifier circuit

A technology of amplifier circuit and differential amplifier, which is applied in the direction of amplifier, differential amplifier, amplification control, etc., and can solve the problems of total bandwidth degradation and so on

Inactive Publication Date: 2019-06-04
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, parasitic capacitor effects can produce undesirably high gain amplitudes (overpeaking) in the high frequency range of the frequency response
Although some traditional modifications of VGA can reduce this overpeaking, such modifications may cause the degradation of the overall bandwidth

Method used

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  • Amplifier circuit
  • Amplifier circuit
  • Amplifier circuit

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Embodiment Construction

[0056] The following disclosure provides many different embodiments, or examples, for implementing different features of the presented subject matter. Specific examples of components and arrangements are set forth below to simplify the present disclosure. Of course, these are examples only and are not intended to be limiting. For example, the description below that a first feature is formed "on" a second feature or "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include An embodiment wherein an additional feature may be formed between the first feature and the second feature such that the first feature may not be in direct contact with the second feature. Additionally, this disclosure may reuse reference numbers and / or letters in various instances. Such re-use is for brevity and clarity and does not itself indicate a relationship between the various embodiments and / or configurations discussed.

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Abstract

A amplifier circuit in some embodiment includes a differential amplifier have a pair of current sources. Each of the current sources includes two or more current-generating transistors and respectiveswitching transistors, which can be turned on and off by a gain input code to tune the gain of the amplifier. A common-mode controller includes a similar pair of current sources as the differential amplifier. The common mode controller receives a common-mode signal of the input signal and a common-mode gain input code, and maintains the common-mode gain of the amplifier circuit when the differential gain changes. The amplifier circuit is switchable between a buffer mode and an equalizer mode.

Description

technical field [0001] Embodiments of the present invention relate to an amplifier circuit, and more particularly to an amplifier circuit with tunable gain. Background technique [0002] Amplifiers and equalizers are often used in high-speed circuits. For short channel applications, simple amplification is sufficient. For long channel applications, an equalizer can be used to boost certain spectral parts of the signal relative to other parts. [0003] Signal loss can be compensated using a voltage gain amplifier (VGA) and a continuous-time linear equalizer (CTLE). To minimize distortion, use a configuration with VGA followed by CTLE. However, this configuration reduces the overall bandwidth. In addition, some conventional VGAs use source degeneration variable resistors for gain control. However, parasitic capacitor effects can produce undesirably high gain amplitudes (overpeaking) in the high frequency range of the frequency response. Although some traditional modifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03G3/30
CPCH03F3/45179H03F3/45197H03F3/45632H03F2203/45702H03F3/45H03F3/45076
Inventor 杨淑君陈威志施育男
Owner TAIWAN SEMICON MFG CO LTD