Unlock instant, AI-driven research and patent intelligence for your innovation.

Amplifier apparatus and receiver

A technology of amplifying device and receiver, which is applied in the direction of amplification control, code division multiplexing system, electrical components, etc., and can solve problems such as the change of gain amplifier 1

Inactive Publication Date: 2004-04-28
MITSUBISHI ELECTRIC CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But when figure 1 and figure 2 In the amplifier shown, the analog input signal x 0 When noise is included in , the gain control section 3 will follow the noise, and the gain of the variable gain amplifier 1 will change excessively

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Amplifier apparatus and receiver
  • Amplifier apparatus and receiver
  • Amplifier apparatus and receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the present invention, in view of the above situation, the amplifying device adopts Figure 5 structure shown. Figure 5 It is a configuration diagram showing a receiver incorporating an amplifier device according to the first embodiment. In the figure, 11 is a receiver, which is composed of a receiver 7 , an amplifier 10 and a demodulator 8 . The amplifying device 10 is composed of a signal level detection unit 9, a selection unit 6, a gain control unit 3, a variable gain amplifier 1 and a first A / D amplifier 21, and the signal level detection unit 9 is composed of a nonlinear amplifier 4 and a second A / D amplifier. Converter 22 constitutes. Here, the nonlinear amplifier 4 is, for example, a logarithmic amplifier, and the selection unit 6 is, for example, a peak detector.

[0035] Next, the operation of the receiver 11 will be briefly described. The signal level detection unit 9 detects the reception signal x input to the variable gain amplifier 1 0and output t...

Embodiment 2

[0048] In the amplifying device of Embodiment 1, the selection unit 6 is provided at Figure 5 The shown is a subsequent stage of the second A / D converter 22 , however, as shown in the second embodiment, the selection unit 6 may be provided in a preceding stage of the second A / D converter 22 .

[0049] Figure 7 It is a configuration diagram showing a receiver including the amplifying device of the second embodiment. In the figure, for Figure 5 The same or corresponding parts are marked with the same symbols, and descriptions thereof are omitted. Here, will Figure 5 The selection unit 6 shown is disposed between the nonlinear amplifier 4 and the second A / D converter 22 , and a peak hold circuit is used as the selection unit 6 . Next, the operation thereof will be described. Non-linear amplifier 4 output and receive signal x 0 The signal level corresponds to the DC voltage x 1 . The peak hold circuit as the selection part 6 continuously outputs the DC voltage x within...

Embodiment 3

[0052] Figure 9 It is a configuration diagram showing a receiver including the amplifying device of the third embodiment. In the figure, for Figure 7 The same or equivalent parts are marked with the same symbols. and omit its description. Here, an averaging circuit 12 is provided at a subsequent stage of the second A / D change 22 . In addition, 13 is an averaging circuit control unit. Next, the operation thereof will be described. Non-linear amplifier 4 output and receive signal x 0 The signal level corresponds to the DC voltage x 1 . The selector 6 continuously outputs the DC voltage x during the specified period 1 The maximum voltage of x 2 . The second A / D change 22 is the maximum voltage x output by the selection part 6 2 It is converted into a digital value and output to the averaging circuit 12 . The averaging circuit 12 calculates the average value of the digital values ​​output by the second A / D changer 22 and outputs it to the gain control unit 3 . The g...

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

No PUM Login to View More

Abstract

The conventional amplifier apparatuses and receivers had a problem that their gains excessively vary when amplifying signals including noise. The amplifier apparatus and receiver of the present ivnention comprise variable gain amplifier means for amplifying and outputting analog input signals determining means for determining the signal levels of the analog input signals selector means for selecting among the signal levels determined by the determining means a relatively high signal level gain control means for controlling based on the signal level selected by the selector means the gain of the variable gain amplifier means.

Description

technical field [0001] The present invention relates to an amplifying device for amplifying and outputting an analog signal, and a receiver for amplifying, A / D converting and demodulating a signal spread according to a spreading code series. Background technique [0002] figure 1 It is a block diagram showing the basic structure of a conventional amplifier. In the figure, x 0 1 is an analog input signal, 1 is a variable gain amplifier, 2 is an A / D converter, and 3 is a gain control unit. Variable gain amplifier 1 amplifies the analog input signal x 0 , and output to A / D converter 2. The A / D converter 2 A / D converts the signal from the variable gain amplifier 1 to output a digital signal. The gain control unit 3 controls the gain of the variable gain amplifier 1 based on the digital signal. [0003] But when figure 1 In the amplifying device shown, when a signal whose magnitude exceeds the conversion capability of the A / D converter 2 is input to the A / D converter 2, th...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03G3/30
CPCH03G3/3052H03G3/3036
Inventor 山口达也永野弘明
Owner MITSUBISHI ELECTRIC CORP