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Device comprising a feedback-less gain controlled amplifier

A feedback amplifier and control electrode technology, used in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as small input voltage range, and achieve the effect of large frequency range and low complexity

Inactive Publication Date: 2008-09-03
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, this feedback-free amplifier has a relatively small input voltage range and is only suitable for relatively small input voltage

Method used

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  • Device comprising a feedback-less gain controlled amplifier
  • Device comprising a feedback-less gain controlled amplifier
  • Device comprising a feedback-less gain controlled amplifier

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Embodiment Construction

[0040] figure 1 The shown device 1 according to the invention comprises an antenna unit 11 connected to mixers 14 and 17 via a low noise amplifier 12 and a balun 13 . The mixer 14 is connected to a feedback-less amplifier 16 through a filter 15 and the mixer 17 is connected to a feedback-less amplifier 19 through a filter 18 . The feedback-free amplifiers 16 and 19 are gain controlled and are also connected to an intermediate frequency unit and / or a baseband unit, neither shown.

[0041] figure 2 The shown device 2 according to the invention comprises a baseband unit and / or an intermediate frequency unit, neither shown, and is connected to feedback-free amplifiers 26 and 29 . The feedback-free amplifiers 26 and 29 are gain controlled and are also connected via filters 25 , 28 and mixers 24 , 27 to a power amplifier 22 which is further connected to the antenna unit 21 .

[0042] (Gain Control) Each of the feedback-free amplifiers 16, 19, 26, 29 is as image 3 As shown, it ...

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Abstract

Devices (1,2) comprises feedback-less amplifiers (16,19,26,29) that are gain controlled introduce linear relationships between output signals and input signals of the feedback- less amplifiers (16,19,26,29) by providing the feedback- less amplifiers (16,19,26,29) with first circuits (3) comprising first sub-circuits in the form of first transistors (33) operated in their triode regions for receiving input signals and second sub-circuits in the form of second transistors (34) for receiving control signals and third sub-circuits in the form of resistors (35) for generating output signals, whereby the respective first and second and third sub-circuits form a serial path. Second circuits (4) receive gain signals and convert the gain signals into the control signals. The control signals are copies of the gain signals. The second circuits (4) comprise current sources (6) and third and fourth transistors (41,42). The current sources (6) comprise fifth and sixth transistors (61,62). The second circuits (4) further comprise voltage sources (9) comprising further resistors coupled to further current sources. Third circuits (8) compensate common mode currents.

Description

technical field [0001] The present invention relates to a device comprising a feedback-less amplifier, and also to a feedback-less amplifier and a method of feedback-less amplification. [0002] Examples of such devices are radio frequency receivers and / or radio frequency transmitters and / or radio frequency transceivers. An example of such a feedback-free amplifier is a feedback-free gain control IF amplifier. Background technique [0003] A prior art arrangement is known from US 6,791,413 B2, which discloses a variable gain amplifier having a gain whose dB characteristic is linear with respect to the control voltage. Therefore, the amplifier is a linear gain amplifier in dB. There is a linear relationship between the output voltage and the gain factor in dB. However, as in US 6,791,413 B2 figure 2 As shown, there is a non-linear relationship between the output voltage and the input voltage. [0004] The initially non-linear relationship between output voltage and input...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45H03F2200/372
Inventor 米哈伊·A·T·桑托利努爱德华·F·斯蒂克沃罗特
Owner NXP BV
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