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Current Amplifiers and Transmitters

A current amplifier and current technology, applied in amplifiers, high-frequency amplifiers, power amplifiers, etc., can solve the problems that the DC output voltage of the current amplifier cannot reach the desired optimal value, the structure is complex, and it is difficult to design.

Active Publication Date: 2019-03-29
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current-steering digital-to-analog converters (Digital-to-Analog Converters, DACs) are the preferred devices for implementing high-speed and high-resolution transmitters, but it is difficult to design A current-mode DAC that satisfies both large output swing and small distortion during operation
Therefore, current amplifiers are currently used to solve the above problems, but most of the currently available current amplifiers have complex structures, and the DC output voltage of the current amplifiers often cannot reach the desired optimal value, and in order to achieve the desired optimal output, the power supply voltage needs to be adjusted to Make it big enough that it consumes a lot of power

Method used

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  • Current Amplifiers and Transmitters
  • Current Amplifiers and Transmitters
  • Current Amplifiers and Transmitters

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Embodiment Construction

[0024] The following description illustrates various embodiments for implementing the invention. The description here is only used to illustrate the basic principles of the present invention and should not be used to limit the present invention.

[0025] figure 1 A current amplifier of one embodiment of the present invention is described. The current amplifier includes at least two transistors (transistors) M1 and M2, and also includes at least two impedance (impedance) circuits Zi and Zs. The gate of the transistor M1 is coupled to a former-stage circuit through a node X. As shown in the figure, the drain of the transistor M1 is coupled to a current source (simplified as impedance element Zo), and the source of the transistor M1 is biased at a constant voltage level (eg, ground, but not limited thereto). The gate of the transistor M2 is coupled to the current source (Zo), and the transistor M2 also includes a source and a drain. The impedance circuit Zi is coupled between...

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Abstract

The invention relates to a current amplifier and a transmitter using the same. The current amplifier has a first and second transistor and a voltage level shifting unit. The first transistor has a gate receiving an input current and a drain receiving a driving current. The voltage level shifting unit providing a voltage shift is coupled between the drain of the first transistor and the gate of the second transistor. An output current is generated at the drain of the second transistor.

Description

[0001] This application is a continuation-in-part of Patent Application No. 13 / 910,615, filed June 5, 2013, and also claims U.S. Provisional Patent Application No. 62 / 192,154, filed July 14, 2015 The priority of the application, all the technical features of 62 / 192,154 are included in this application. 【Technical field】 [0002] The invention relates to the technical field of circuits, in particular to a current amplifier and a transmitter. 【Background technique】 [0003] Today, modern communication systems require high data rates and long-distance transmission. Therefore, a high-speed and high-linearity transmitter (transmitter) becomes more and more important. Current-steering digital-to-analog converters (Digital-to-Analog Converters, DACs) are the preferred devices for implementing high-speed and high-resolution transmitters, but it is difficult to design It is a current-mode DAC that satisfies both large output swing and small distortion during operation. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/343H03F3/24H03F3/19H03F3/21H04B1/04
CPCH03F3/19H03F3/21H03F3/245H03F3/343H04B1/04
Inventor 范鐏元张文华
Owner MEDIATEK INC