Variable gain amplifier having wide gain variation and wide bandwidth

A technology of gain amplifier and gain change, which is applied in the direction of differential amplifier, gain control, amplification control, etc., and can solve problems such as bandwidth reduction

Inactive Publication Date: 2009-03-25
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at higher gain settings, the I 0 (1-x) decreases, and the bandwidth decreases

Method used

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  • Variable gain amplifier having wide gain variation and wide bandwidth
  • Variable gain amplifier having wide gain variation and wide bandwidth
  • Variable gain amplifier having wide gain variation and wide bandwidth

Examples

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Embodiment Construction

[0037] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] FIG. 3 is a block diagram illustrating a variable gain amplifier according to an exemplary embodiment of the present invention.

[0039]Referring to FIG. 3 , a variable gain amplifier 100 according to an exemplary embodiment of the present invention may include a gain adjustment part 110 and a differential amplification part 120 .

[0040] The gain adjustment section 110 adjusts the gain of the differential amplification section 120 by a predetermined approximation exponential function.

[0041] The gain adjustment unit 110 includes a current converter 112 . When the control signal supplied from the outside is a current signal, the current converter 112 converts the voltage level of the current signal into a predetermined current level. The gain adjustment section 110 further includes a voltage-current converter 111 and a bias circuit 11...

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Abstract

There is provided a variable gain amplifier that is implemented with a CMOS device and has wide band variation and wide bandwidth by a predetermined exponential function. A variable gain amplifier having wide gain variation and wide bandwidth according to an aspect of the invention may include: a differential amplification section differentially amplifying an input signal according to a gain adjustment signal; and a gain adjustment section supplying the gain adjustment signal on the basis of an approximated exponential function determined according to a predetermined bias current, and adjusting a gain of the differential amplification section.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 2007-0094746 filed with the Korean Intellectual Property Office on Sep. 18, 2007, the contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a variable gain amplifier, and more particularly, to a variable gain amplifier implemented in a CMOS device and having a wide gain variation and a wide bandwidth by a predetermined exponential function. Background technique [0004] Typically, a variable gain amplifier (VGA) is used to provide variable gain to various electronic devices such as disk drives, hearing aids, medical instruments, and communication equipment. Here, since the amplitude of signals used in electronic equipment can vary over a wide range, the gain variation needs to be as wide as possible. For example, a Code Division Multiple Access (CDMA) communication system requires a gain chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03G1/04
CPCH03G1/0029H03G7/06H03G3/30H03F3/45
Inventor 杨国煌金应周李相国李贞珗崔奉洛金泓凤
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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