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low distortion amplifier

A technology of amplifiers and gain amplifiers, applied in the direction of amplifiers, amplification control, components of amplification devices, etc., can solve problems such as output distortion, and achieve the effect of reducing distortion and low harmonic distortion

Inactive Publication Date: 2011-12-14
CAMBRIDGE SILICON RADIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, where a resistive feedback element is used instead of capacitor 36, there is no advantage to this system due to nonlinearities in the feedback transistors 40, 42, 44 distorting the output of the operational amplifier 32

Method used

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Embodiment Construction

[0027] now refer to figure 2 , generally denoting the variable gain amplifier circuit according to the embodiment of the present invention as 100 . Circuit 100 includes an input amplifier 102, which is an operational amplifier (op-amp) in this example, an intermediate amplifier 104, and an output amplifier 106, which is an operational amplifier in this example.

[0028] The input terminal 108 of the input operational amplifier 102 is connected to a plurality of parallel input branches 110, 112, 114 each comprising an input resistance 116, 118, 120 which may for example be a printed resistor. Each input branch also comprises an input transistor 122, 124, 126 operating as a switch, with which input transistor 122, 124, 126 the input 108 of the input operational amplifier 102 can be connected to one of the input branches 110, 112, 114 and Included therein are input resistors 116, 118, 120.

[0029] The values ​​of the input resistors 110, 112, 114 are adjusted relative to each...

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PUM

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Abstract

A variable gain amplifier circuit (200) comprising an amplifier element (202) having an input (208, 210) and an output (220, 222); a feedback loop (224, 226) having a feedback impedance (228, 230) connected between the input (208, 210) and output (232, 234) of the amplifier element (202); an input branch (212, 214) having an input resistance connected between an input of the variable gain amplifier circuit and the input (208, 210) of the amplifier element (202); and a plurality of switches for selecting a gain of the variable gain amplifier circuit (200); characterised in that the variable gain amplifier circuit (200) further comprises an intermediate element (204) having an input and an output, the input being connected to a node between one of the switches and the feedback impedance (228, 230), such that the output can provide a signal which can be used to attenuate a signal component in the output (220, 222) of the amplifier element (202) caused by a non-linearity in the plurality of switches.

Description

technical field [0001] The present invention relates to an amplifier circuit and an integrated circuit including such an amplifier circuit. Background technique [0002] Electronic amplifiers are commonly used in audio and radio applications to amplify or attenuate input signals. This allows outputting a signal with a suitable amplitude to other signal processing components downstream of the amplifier. Typically, the amplifier is a variable gain amplifier, enabling input signals with varying amplitudes to be received and amplified or attenuated appropriately to ensure maximum signal-to-noise ratio (SNR). [0003] The voltage gain of a variable gain amplifier is typically determined by a feedback network, which may include an input resistor and a resistor connected in a feedback loop between the amplifier's input and output. Typically, the feedback resistor is fixed, while the input resistor can be varied. It is common to provide multiple input branches in parallel, each b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G1/00H03G1/04
CPCH03G1/04H03F1/3211H03G1/0088H03F1/086H03F1/3223
Inventor H·扎雷-霍塞尼I·萨贝通
Owner CAMBRIDGE SILICON RADIO