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A high dynamic range low-power differential input stage

A large dynamic range, differential input technology, applied in the direction of differential amplifiers, amplifiers, amplifier types, etc., can solve problems such as large dynamic range

Inactive Publication Date: 2008-06-18
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]The disadvantage of the prior art is that a large dynamic range can only be achieved through high power consumption

Method used

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  • A high dynamic range low-power differential input stage
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  • A high dynamic range low-power differential input stage

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Embodiment Construction

[0021] Those of ordinary skill in the art should understand that the following description is provided for purposes of illustration and not limitation. A skilled artisan understands that there are many variations that fall within the spirit of the invention and scope of the appended claims. Unnecessary detail of well-known functions and operations may be omitted from the current description so as not to obscure the invention.

[0022] The systems and methods of the present invention provide a high dynamic range low power differential input stage.

[0023] now refer to figure 2 , transistor 101 is with figure 1 are of the same type as the conventional input stages shown in, therefore, they have the same internal base resistance R of 15 ohms b . The total tail current is:

[0024] 2×1mA=2mA,

[0025] instead of the 10mA in traditional input stages.

[0026] Emitter degeneration is achieved by a capacitor 201 located between the emitters 104 instead of two resistors 102 ....

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Abstract

A low-power high dynamic range RF input stage (200) with a noiseless degeneration component, such as a capacitor (201), is provided. High dynamic range means a combination of low noise contribution by the stage (200) and a low level of intermodulation products occurring especially at high input levels. Low power means that the power consumption of a conventional input stage is about 5 times higher than the power consumption of the stage according to the invention, for the same noise, gain and distortion level. This new stage can be used in amplifiers, but also in the lower stage of double balanced mixers (300-400) commonly used in RF receivers, examples of which are applications, are provided.

Description

technical field [0001] The present invention relates to a low power differential input stage with a large dynamic range. Background technique [0002] A typical differential input stage such as figure 1 shown. A plurality of transistors 101 together form an amplification stage. To achieve low noise contribution, the internal base resistors R of the two transistors 101 b Has a low value (15 ohms). In addition, the two 15 ohm degeneration resistors 102 between the emitters are also of low value to minimize the thermal noise contribution of the transistor. The total noise is determined by the sum of the two internal base resistors R b , the two resistors 102 between the emitters 104, and twice half the small signal internal emitter resistance, where the internal emitter resistance is: [0003] r e =kT / qI e , I e is the emitter current of one of the transistors, [0004] For an emitter current of 5mA per transistor, r e Equal to 5 ohms per transistor. Then the noise ...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03D7/14
CPCH03D7/1441H03F3/45H03D2200/0043H03F2203/45458H03F1/3211H03F3/45098H03F2200/372H03D7/1433H03F2203/45702H03F2200/294H03D7/1458H03F2200/513H03D7/1408H03F2203/45472
Inventor 奥斯瓦德·约瑟夫·穆尼马克·兰伯特斯·约翰内斯·维兰明斯阿纳尔德·亨德里克·尼兰
Owner NXP BV