Adjustable gain amplifier with gain adjusting device
A gain amplifier and gain adjustment technology, applied in the direction of gain control, amplification control, artificial gain control, etc., can solve problems such as complexity, difficulty in system design, bulky gain compensation circuit, etc., and achieve the effect of improving quality
Active Publication Date: 2010-01-06
VIA TECH INC
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In order to compensate for the difference of about 3dB, an additional gain compensation circuit is usually designed to compensate the current gain. However, the known gain compensation circuit is bulky and complex, which also greatly increases the difficulty of system design.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0053] An adjustable gain amplifier with a gain adjusting device according to an embodiment of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference numerals.
[0054] Please refer to Figure 4 As shown, the gain adjustment device 3 of the embodiment of the present invention is used to control an amplifying circuit 6 . Wherein, the gain adjustment device 3 includes a linear index conversion circuit 31 , a voltage buffer circuit 32 and a power conversion circuit 33 .
[0055] Figure 5 It is a schematic diagram showing the circuit of the gain adjusting device 3 according to the embodiment of the present invention. Please also refer to Figure 4 and Figure 5 As shown, the linear index conversion circuit 31 includes a resistor R, a first transistor M1 and a second transistor M2. The drain of the first transistor M1 is electrically connected to the power conversion circuit 33 to r...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
An adjustable gain amplifier having a gain adjusting device includes a gain adjusting device and an amplifying circuit, wherein the gain adjusting device includes a linear index conversion loop, a voltage buffer loop and a power-law conversion loop. The linear index conversion loop is uses for converting a linear control signal to output an index control signal, the voltage buffer loop is electrically connected with the linear index conversion loop in order to receive the index control signal and output a feedback signal to the power-law conversion loop based on the index control signal and a bias current. The voltage buffer loop also outputs a voltage control signal to control the gain of the amplifying circuit. The power-law conversion loop is electrically connected to the linear index conversion loop and the voltage buffer loop in order to receive the index control signal and the feed back signal, and extract the product of the index control signal and feed back signal and then multiply 2 and plus the bias current in order to output a power-law signal to the linear index conversion loop.
Description
technical field [0001] The invention relates to an adjustable gain amplifier with a gain adjustment device, in particular to an adjustable gain amplifier with a gain adjustment device using a complementary metal oxide semiconductor. Background technique [0002] Due to the advancement of communication technology, wireless communication has been widely used in various electronic products. Today's communication system has entered the era of third-generation mobile communication (Wideband Code Division Multiple Access, WCDMA), so the quality of communication The requirements are even higher. In addition, in the WCDMA communication system, because the internal circuit needs to use the amplifier, the quality of the amplifier directly affects the communication quality. [0003] For an adjustable gain amplifier (Variable Gain Amplifier, VGA) (hereinafter referred to as the amplifier), the gain value is one of the important indicators of the amplifier, such as figure 1 As shown, t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/00H03G3/04
Inventor 李文昶曾英哲
Owner VIA TECH INC