Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

VCA824IDG4 Datasheet(PDF) 29 Page - Texas Instruments

Part No. VCA824IDG4
Description  Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier
Download  41 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo 

VCA824IDG4 Datasheet(HTML) 29 Page - Texas Instruments

Zoom Inzoom in Zoom Outzoom out
 29 / 41 page
background image
1.5
1.0
-1.5
Time( s)
m
0
1
10
2
0.5
-1.0
-0.5
0
9
8
7
6
5
4
3
V
OUT
V
IN
V
G
f
=1MHz
f
=0.1MHz
IN
VG
R
F
+V
IN
R
G+
R
G-
-VIN
FB
R
G
R
2
R
3
20W
V
IN
V
G
R
S
Source
Impedance
R
1
VCA824
VCA824
www.ti.com
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
Typical Application (continued)
Figure 76. Four-Quadrant Multiplier Circuit
Figure 77 illustrates the behavior of this circuit. Keeping the input amplitude of a 1-MHz signal constant and
varying the VG voltage (100 kHz, 2 VPP) gives the modulated output voltage shown in Figure 77.
9.2.1 Design Requirements
A multiplier requires two inputs, one for the X input and one for the Y input. The output of the multiplier circuit is
in the form of Vout = aVin1 × bVin2 : where a and b are real numbers and should not be negative. For four
quadrant operation both positive and negative inputs must be supported on the X and Y inputs.
A four-quadrant multiplier can easily be implemented using the VCA824. By placing a resistor between FB and
VIN, the transfer function depends upon both VIN and VG, as shown in Equation 10
9.2.2 Detailed Design Procedure
Setting R1 to equal RG, the term that depends only on VIN drops out of the equation, leaving only the term that
depends on both VG and VIN. VOUT then follows Equation 11.
The behavior of this circuit is illustrated in Figure 77. Keeping the input amplitude of a 1MHz signal constant and
varying the VG voltage (100 kHz, 2 VPP) gives the modulated output voltage shown in Figure 77.
9.2.3 Application Curve
Figure 77. Modulated Output Signal of the 4-Quadrant Multiplexer Circuit
Copyright © 2007–2016, Texas Instruments Incorporated
Submit Documentation Feedback
29
Product Folder Links: VCA824


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn