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Voltage divider

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divider with an output ratio of 3.3/5 might be used to reduce the 5 V signal to 3.3 V, to allow the circuits to interoperate without damaging the 3.3 V circuit. For this to be feasible, the 5 V source impedance and 3.3 V input impedance must be negligible, or they must be constant and the divider resistor values must account for their impedances. If the input impedance is capacitive, a purely resistive divider will limit the data rate. This can be roughly overcome by adding a capacitor in series with the top resistor, to make both legs of the divider capacitive as well as resistive.
2533:. The high voltage is applied across the divider, and the divider output—which outputs a lower voltage that is within the meter's input range—is measured by the meter. High voltage resistor divider probes designed specifically for this purpose can be used to measure voltages up to 100 kV. Special high-voltage resistors are used in such probes as they must be able to tolerate high input voltages and, to produce accurate results, must have matched 100: 2500: 722: 1800: 1451: 2329: 1612: 1293: 2445:
To obtain a sufficiently stable output voltage, the output current must either be stable (and so be made part of the calculation of the potential divider values) or limited to an appropriately small percentage of the divider's input current. Load sensitivity can be decreased by reducing the impedance
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to interface two circuits that use different operating voltages. For example, some logic circuits operate at 5 V whereas others operate at 3.3 V. Directly interfacing a 5 V logic output to a 3.3 V input may cause permanent damage to the 3.3 V circuit. In this case, a voltage
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Another example that is commonly used involves a potentiometer (variable resistor) as one of the resistive elements. When the shaft of the potentiometer is rotated the resistance it produces either increases or decreases, the change in resistance corresponds to the angular change of the shaft. If
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Voltage dividers can be used to allow a microcontroller to measure the resistance of a sensor. The sensor is wired in series with a known resistance to form a voltage divider and a known voltage is applied across the divider. The microcontroller's analog-to-digital converter is connected to the
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center tap of the divider so that it can measure the tap voltage and, by using the measured voltage and the known resistance and voltage, compute the sensor resistance. This technique is commonly used to measure the resistance of temperature sensors such as
1409: 1795:{\displaystyle {\frac {V_{\mathrm {out} }}{V_{\mathrm {in} }}}={\frac {Z_{\mathrm {2} }}{Z_{\mathrm {1} }+Z_{\mathrm {2} }}}={\frac {\frac {1}{\mathrm {j} \omega C}}{{\frac {1}{\mathrm {j} \omega C}}+R}}={\frac {1}{1+\mathrm {j} \omega RC}}\ .} 2639: 691: 2604: 1134: 1563: 2048: 867: 575: 275: 2537:
and very low voltage coefficients. Capacitive divider probes are typically used for voltages above 100 kV, as the heat caused by power losses in resistor divider probes at such high voltages could be excessive.
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at low frequencies. For direct current and relatively low frequencies, a voltage divider may be sufficiently accurate if made only of resistors; where frequency response over a wide range is required (such as in an
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coupled with a stable voltage reference, the output voltage can be fed into an analog-to-digital converter and a display can show the angle. Such circuits are commonly used in reading control knobs.
2324:{\displaystyle V_{\mathrm {out} }={\frac {Xc_{2}}{Xc_{1}+Xc_{2}}}\cdot V_{\mathrm {in} }={\frac {1/C_{2}}{1/C_{1}+1/C_{2}}}\cdot V_{\mathrm {in} }={\frac {C_{1}}{C_{1}+C_{2}}}\cdot V_{\mathrm {in} }} 356: 91:
probe), a voltage divider may have capacitive elements added to compensate load capacitance. In electric power transmission, a capacitive voltage divider is used for measurement of high voltage.
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Resistor voltage dividers are commonly used to create reference voltages, or to reduce the magnitude of a voltage so it can be measured, and may also be used as signal
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of both halves of the divider, though this increases the divider's quiescent input current and results in higher power consumption (and wasted heat) in the divider.
594: 1288:{\displaystyle R_{1}={\frac {R_{2}\cdot V_{\mathrm {in} }}{V_{\mathrm {out} }}}-R_{2}=R_{2}\cdot \left({{\frac {V_{\mathrm {in} }}{V_{\mathrm {out} }}}-1}\right)} 2344:
elements in the proper proportions, the same division ratio can be maintained over a useful range of frequencies. This is the principle applied in compensated
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Voltage dividers are used for adjusting the level of a signal, for bias of active devices in amplifiers, and for measurement of voltages. A
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Any leakage current in the capactive elements requires use of the generalized expression with two impedances. By selection of parallel
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The ratio then depends on frequency, in this case decreasing as frequency increases. This circuit is, in fact, a basic (first-order)
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is the result of distributing the input voltage among the components of the divider. A simple example of a voltage divider is two
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It is required for the R1 resistor to be at least ten times larger than R2 to avoid a divider circuit (R2 ≤ 10 R1).
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greater than 1 is not possible. That is, using resistors alone it is not possible to either invert the voltage or increase
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are often used in lieu of passive voltage dividers when it is necessary to accommodate high or fluctuating load currents.
1090:{\displaystyle {\frac {V_{\mathrm {out} }}{V_{\mathrm {in} }}}={\frac {R_{2}}{R_{1}+R_{2}}}={\frac {6}{9}}={\frac {2}{3}}} 76: 1938:{\displaystyle \left|{\frac {V_{\mathrm {out} }}{V_{\mathrm {in} }}}\right|={\frac {1}{\sqrt {1+(\omega RC)^{2}}}}\ .} 362: 2356:
The output voltage of a voltage divider will vary according to the electric current it is supplying to its external
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Inductive dividers split AC input according to the reactance of the elements as for the resistive divider above.
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probe tip and ground is connected to the other end of the divider via the black cable. The divider output (
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SN74HCS72 Schmitt-Trigger Input Dual D-Type Negative-Edge-Triggered Flip-Flops With Clear and Preset
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in series, as shown in Figure 1. The input voltage is applied across the series impedances
2570: 2459: 2447: 2382: 2056: 701: 686:{\displaystyle H={\frac {V_{\mathrm {out} }}{V_{\mathrm {in} }}}={\frac {Z_{2}}{Z_{1}+Z_{2}}}} 581: 2686: 1600: 697: 165:
If the current in the output wire is zero then the relationship between the input voltage,
99: 2560: 2357: 2060: 1823: 43: 2499: 1558:{\displaystyle Z_{2}=-\mathrm {j} X_{\mathrm {C} }={\frac {1}{\mathrm {j} \omega C}}\ ,} 1826:. The ratio contains an imaginary number, and actually contains both the amplitude and 1592: 46: 2043:{\displaystyle V_{\mathrm {out} }={\frac {L_{2}}{L_{1}+L_{2}}}\cdot V_{\mathrm {in} }} 862:{\displaystyle V_{\mathrm {out} }={\frac {R_{2}}{R_{1}+R_{2}}}\cdot V_{\mathrm {in} }} 570:{\displaystyle V_{\mathrm {out} }=V_{\mathrm {in} }\cdot {\frac {Z_{2}}{Z_{1}+Z_{2}}}} 270:{\displaystyle V_{\mathrm {out} }={\frac {Z_{2}}{Z_{1}+Z_{2}}}\cdot V_{\mathrm {in} }} 27:
Linear circuit that produces an output voltage that is a fraction of its input voltage
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information of the filter. To extract just the amplitude ratio, calculate the
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is used as a variable voltage divider in the volume control of many radios.
1459: 705: 159: 155: 151: 72: 948:{\displaystyle V_{\mathrm {out} }={\frac {1}{2}}\cdot V_{\mathrm {in} }} 1450: 1101: 50: 2498: 720: 98: 2503:
High voltage (HV) resistor divider probe. The HV to be measured (
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Inductive dividers split AC input according to inductance:
2360:. The effective source impedance coming from a divider of 2333:(with components in the same positions as Figure 2.) 2052:(with components in the same positions as Figure 2.) 474:{\displaystyle I={\frac {V_{\mathrm {in} }}{Z_{1}+Z_{2}}}} 729:
A resistive divider is the case where both impedances,
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may be composed of any combination of elements such as
972: = 9 V (both commonly used voltages), then: 351:{\displaystyle V_{\mathrm {in} }=I\cdot (Z_{1}+Z_{2})} 2085: 2055:
The above equation is for non-interacting inductors;
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June 2020 . p. 11. SCLS801A. 771:into the previous expression gives: 2315: 2312: 2255: 2252: 2169: 2166: 2098: 2095: 2092: 2034: 2031: 1974: 1971: 1968: 1877: 1874: 1862: 1859: 1856: 1770: 1732: 1712: 1645: 1642: 1630: 1627: 1624: 1536: 1520: 1510: 1380: 1377: 1374: 1362: 1359: 1266: 1263: 1260: 1248: 1245: 1195: 1192: 1189: 1176: 1173: 1011: 1008: 996: 993: 990: 939: 936: 908: 905: 902: 853: 850: 793: 790: 787: 633: 630: 618: 615: 612: 519: 516: 501: 498: 495: 438: 435: 378: 375: 372: 304: 301: 261: 258: 201: 198: 195: 25: 2466:both include voltage dividers. A 2529:so that it can be measured by a 107:A voltage divider referenced to 2645:from the original on 2023-07-20 2610:from the original on 2023-07-20 2601:Texas Instruments Incorporated 1917: 1904: 345: 319: 1: 2590:"9.2.1 Design Requirements". 584:(also known as the divider's 111:is created by connecting two 1462:as shown in Figure 3. 1111:must be twice the value of 2703: 2667:Voltage Divider Calculator 2063:) will alter the results. 172:, and the output voltage, 2535:temperature coefficients 2495:High voltage measurement 49:that produces an output 1834:of the ratio, that is: 2522: 2325: 2044: 1939: 1796: 1603:of the input voltage. 1559: 1455: 1405: 1289: 1091: 949: 863: 726: 687: 588:) of this circuit is: 571: 475: 407: 352: 271: 104: 2502: 2326: 2045: 1940: 1797: 1560: 1453: 1406: 1290: 1100:and by solving using 1092: 965: = 6 V and 950: 864: 724: 688: 572: 476: 408: 353: 272: 113:electrical impedances 102: 2542:Logic level shifting 2510:) is applied to the 2374:, as above, will be 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2569: 2567: 2564: 2562: 2559: 2558: 2554: 2552: 2549: 2541: 2539: 2536: 2532: 2528: 2517: 2513: 2506: 2501: 2494: 2492: 2488: 2486: 2482: 2473: 2471: 2469: 2468:potentiometer 2465: 2461: 2453: 2451: 2449: 2443: 2438: 2431: 2424: 2417: 2411: 2408:), that is: ( 2404: 2401: 2395: 2388: 2384: 2377: 2370: 2363: 2359: 2351: 2349: 2347: 2343: 2339: 2334: 2331: 2307: 2303: 2295: 2291: 2287: 2282: 2278: 2271: 2267: 2261: 2247: 2243: 2235: 2231: 2226: 2222: 2219: 2214: 2210: 2205: 2201: 2194: 2190: 2185: 2181: 2175: 2161: 2157: 2149: 2145: 2141: 2138: 2133: 2129: 2125: 2118: 2114: 2110: 2104: 2087: 2078: 2075: 2069: 2067: 2064: 2062: 2058: 2053: 2050: 2026: 2022: 2014: 2010: 2006: 2001: 1997: 1990: 1986: 1980: 1963: 1954: 1948: 1932: 1921: 1913: 1910: 1907: 1901: 1898: 1894: 1889: 1885: 1869: 1851: 1845: 1837: 1836: 1835: 1833: 1829: 1825: 1820: 1818: 1817: 1816:time constant 1812: 1809:(tau) = 1808: 1789: 1780: 1777: 1774: 1766: 1763: 1759: 1754: 1748: 1745: 1739: 1736: 1727: 1719: 1716: 1707: 1701: 1692: 1687: 1683: 1677: 1672: 1664: 1659: 1653: 1637: 1619: 1609: 1608: 1607: 1604: 1602: 1598: 1594: 1590: 1586: 1582: 1578: 1571: 1552: 1543: 1540: 1531: 1526: 1515: 1506: 1503: 1498: 1494: 1486: 1485: 1484: 1479: 1475: 1468: 1463: 1461: 1452: 1445: 1443: 1438: 1431: 1424: 1417: 1395: 1391: 1388: 1369: 1354: 1347: 1343: 1338: 1333: 1329: 1325: 1320: 1316: 1308: 1307: 1306: 1301: 1298:To solve for 1281: 1277: 1274: 1255: 1240: 1233: 1229: 1224: 1220: 1216: 1211: 1207: 1203: 1184: 1168: 1164: 1159: 1155: 1148: 1143: 1139: 1131: 1130: 1129: 1124: 1121:To solve for 1119: 1114: 1107: 1103: 1082: 1079: 1074: 1069: 1066: 1061: 1053: 1049: 1045: 1040: 1036: 1029: 1025: 1019: 1003: 985: 975: 974: 973: 968: 961: 931: 927: 922: 919: 914: 897: 889: 888: 887: 882: 875: 845: 841: 833: 829: 825: 820: 816: 809: 805: 799: 782: 774: 773: 772: 763: 756: 749: 746:Substituting 744: 739: 732: 723: 716: 711: 709: 707: 703: 699: 675: 671: 667: 662: 658: 651: 647: 641: 625: 607: 601: 598: 591: 590: 589: 587: 586:voltage ratio 583: 559: 555: 551: 546: 542: 535: 531: 525: 511: 507: 490: 482: 463: 459: 455: 450: 446: 430: 424: 421: 414: 398: 394: 390: 387: 384: 367: 359: 340: 336: 332: 327: 323: 316: 313: 310: 296: 288: 287: 286: 283: 280:Proof (using 253: 249: 241: 237: 233: 228: 224: 217: 213: 207: 190: 182: 181: 180: 175: 168: 163: 161: 157: 153: 146: 139: 132: 125: 118: 114: 110: 101: 94: 92: 90: 85: 80: 78: 75:connected in 74: 70: 63: 56: 52: 48: 45: 41: 37: 33: 19: 2647:. Retrieved 2627: 2618: 2612:. Retrieved 2592: 2585: 2545: 2527:high voltage 2524: 2515: 2504: 2489: 2477: 2457: 2454:Applications 2444: 2436: 2429: 2422: 2415: 2409: 2402: 2393: 2386: 2375: 2368: 2361: 2355: 2346:oscilloscope 2341: 2337: 2335: 2332: 2079: 2076: 2073: 2065: 2054: 2051: 1955: 1952: 1821: 1814: 1810: 1806: 1805:The product 1804: 1605: 1596: 1588: 1580: 1569: 1567: 1477: 1473: 1466: 1464: 1457: 1436: 1429: 1422: 1415: 1413: 1299: 1297: 1122: 1120: 1112: 1105: 1099: 966: 959: 957: 880: 873: 871: 761: 754: 747: 745: 737: 730: 728: 695: 585: 579: 279: 173: 166: 164: 144: 137: 130: 123: 116: 106: 95:General case 89:oscilloscope 81: 68: 61: 54: 39: 35: 29: 2512:corona ball 2481:thermistors 1828:phase shift 1585:capacitance 84:attenuators 32:electronics 2676:Categories 2649:2015-11-02 2622:(23 pages) 2614:2023-07-20 2577:References 2531:volt meter 2464:multimeter 2421:) / ( 2059:(as in an 1414:Any ratio 160:capacitors 2435:) = 2304:⋅ 2244:⋅ 2158:⋅ 2023:⋅ 1908:ω 1832:magnitude 1775:ω 1737:ω 1717:ω 1577:reactance 1541:ω 1507:− 1460:capacitor 1389:− 1339:⋅ 1275:− 1230:⋅ 1204:− 1165:⋅ 928:⋅ 842:⋅ 767: = R 706:frequency 526:⋅ 391:⋅ 317:⋅ 282:Ohm's law 250:⋅ 156:inductors 152:resistors 73:resistors 2640:Archived 2605:Archived 2555:See also 2428: + 2383:parallel 1472: = 1421: / 879: = 753: = 712:Examples 2687:Voltage 1591:is the 1583:is the 1575:is the 1102:algebra 698:complex 51:voltage 44:passive 42:) is a 2462:and a 1930:  1787:  1595:, and 1568:where 1550:  1435:above 179:, is: 109:ground 77:series 2643:(PDF) 2636:(PDF) 2608:(PDF) 2597:(PDF) 2385:with 886:then 2485:RTDs 2483:and 2367:and 2340:and 1476:and 760:and 736:and 580:The 158:and 143:and 122:and 34:, a 2519:out 2381:in 1433:out 1419:out 963:out 958:If 872:If 704:of 177:out 67:). 58:out 30:In 2678:: 2599:. 2508:in 2487:. 2442:. 2437:HZ 2400:// 1811:RC 1442:. 1440:in 1426:in 1305:: 1128:: 1118:. 1104:, 970:in 708:. 700:, 284:): 170:in 162:. 154:, 136:. 65:in 2652:. 2516:V 2505:V 2440:1 2433:2 2430:Z 2426:1 2423:Z 2419:2 2416:Z 2413:1 2410:Z 2406:2 2403:Z 2397:1 2394:Z 2390:2 2387:Z 2379:1 2376:Z 2372:2 2369:Z 2365:1 2362:Z 2342:C 2338:R 2316:n 2313:i 2308:V 2296:2 2292:C 2288:+ 2283:1 2279:C 2272:1 2268:C 2262:= 2256:n 2253:i 2248:V 2236:2 2232:C 2227:/ 2223:1 2220:+ 2215:1 2211:C 2206:/ 2202:1 2195:2 2191:C 2186:/ 2182:1 2176:= 2170:n 2167:i 2162:V 2150:2 2146:c 2142:X 2139:+ 2134:1 2130:c 2126:X 2119:2 2115:c 2111:X 2105:= 2099:t 2096:u 2093:o 2088:V 2035:n 2032:i 2027:V 2015:2 2011:L 2007:+ 2002:1 1998:L 1991:2 1987:L 1981:= 1975:t 1972:u 1969:o 1964:V 1933:. 1922:2 1918:) 1914:C 1911:R 1905:( 1902:+ 1899:1 1895:1 1890:= 1886:| 1878:n 1875:i 1870:V 1863:t 1860:u 1857:o 1852:V 1846:| 1807:τ 1790:. 1781:C 1778:R 1771:j 1767:+ 1764:1 1760:1 1755:= 1749:R 1746:+ 1740:C 1733:j 1728:1 1720:C 1713:j 1708:1 1702:= 1693:2 1688:Z 1684:+ 1678:1 1673:Z 1665:2 1660:Z 1654:= 1646:n 1643:i 1638:V 1631:t 1628:u 1625:o 1620:V 1597:ω 1589:j 1581:C 1573:C 1570:X 1553:, 1544:C 1537:j 1532:1 1527:= 1521:C 1516:X 1511:j 1504:= 1499:2 1495:Z 1481:2 1478:Z 1474:R 1470:1 1467:Z 1437:V 1430:V 1423:V 1416:V 1396:) 1392:1 1381:t 1378:u 1375:o 1370:V 1363:n 1360:i 1355:V 1348:( 1344:1 1334:1 1330:R 1326:= 1321:2 1317:R 1303:2 1300:R 1282:) 1278:1 1267:t 1264:u 1261:o 1256:V 1249:n 1246:i 1241:V 1234:( 1225:2 1221:R 1217:= 1212:2 1208:R 1196:t 1193:u 1190:o 1185:V 1177:n 1174:i 1169:V 1160:2 1156:R 1149:= 1144:1 1140:R 1126:1 1123:R 1116:1 1113:R 1109:2 1106:R 1083:3 1080:2 1075:= 1070:9 1067:6 1062:= 1054:2 1050:R 1046:+ 1041:1 1037:R 1030:2 1026:R 1020:= 1012:n 1009:i 1004:V 997:t 994:u 991:o 986:V 967:V 960:V 940:n 937:i 932:V 923:2 920:1 915:= 909:t 906:u 903:o 898:V 884:2 881:R 877:1 874:R 854:n 851:i 846:V 834:2 830:R 826:+ 821:1 817:R 810:2 806:R 800:= 794:t 791:u 788:o 783:V 769:2 765:2 762:Z 758:1 755:R 751:1 748:Z 741:2 738:Z 734:1 731:Z 676:2 672:Z 668:+ 663:1 659:Z 652:2 648:Z 642:= 634:n 631:i 626:V 619:t 616:u 613:o 608:V 602:= 599:H 560:2 556:Z 552:+ 547:1 543:Z 536:2 532:Z 520:n 517:i 512:V 508:= 502:t 499:u 496:o 491:V 464:2 460:Z 456:+ 451:1 447:Z 439:n 436:i 431:V 425:= 422:I 399:2 395:Z 388:I 385:= 379:t 376:u 373:o 368:V 346:) 341:2 337:Z 333:+ 328:1 324:Z 320:( 314:I 311:= 305:n 302:i 297:V 262:n 259:i 254:V 242:2 238:Z 234:+ 229:1 225:Z 218:2 214:Z 208:= 202:t 199:u 196:o 191:V 174:V 167:V 148:2 145:Z 141:1 138:Z 134:2 131:Z 127:2 124:Z 120:1 117:Z 62:V 55:V 53:( 20:)

Index

Voltage division
electronics
passive
linear circuit
voltage
resistors
series
attenuators
oscilloscope

ground
electrical impedances
resistors
inductors
capacitors
Ohm's law
transfer function
complex
rational function
frequency

algebra

capacitor
reactance
capacitance
imaginary unit
radian frequency
time constant
low-pass filter

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