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Encyclopedia > Voltage division

In electronics, a voltage divider or resistor divider is a design technique used to create a voltage (Vout) which is proportional to another voltage (Vin).

Contents

Resistor divider

Two resistors are connected as shown in Figure 1. The output voltage, Vout is related to Vin as follows:

As a simple example, if R1 = R2 then

Any other ratio between 0 and 1 is also possible.


Note that this rule only works if the divider is unloaded, that is, the load resistance is infinite and all of the current flowing through R1 goes into R2. If current flows into a load resistance (through Vout), that resistance must be considered in parallel with R2 (see: resistor) to determine the voltage at Vout.


Schematic of a resistor divider. R1 is connected to Vin and Vout, R2 is connected to Vout and GND
Figure 1: Resistor Divider


General impedance divider

A voltage divider is usually thought of as two resistors, but capacitors, inductors, or any combined impedance can be used. For general impedances Z1 and Z2, the voltage becomes

For instance, a divider with a resistor and capacitor:


Schematic of a voltage divider with a capacitor. Resistor is connected to Vin and Vout, Cap is connected to Vout and GND


will have voltage ratio:



since the capacitor's impedance is 1 / jωC (where j is the imaginary number, and ω is frequency in radians per second). The ratio then depends on frequency, in this case decreasing as frequency increases. This circuit is, in fact, a basic lowpass filter, or, in the world of audio, a treble-cut filter.


See also

External links

  • Calculator: voltage divider - loaded and open circuit (http://www.sengpielaudio.com/calculator-voltagedivider.htm)

  Results from FactBites:
 
Voltage Dividers and Attenuators (1337 words)
A voltage divider is created whenever you have two resistors (or impedances) in series, with the signal "take-off" point between the two.
A traditional voltage divider is shown in Figure 1, and this is the form taken by volume and balance controls, general purpose attenuators, and similar configurations.
It is essential that any attenuator or voltage divider is driven from a low impedance source, or the load of the divider itself will reduce the available voltage (the formula shown will appear to be in error).
  More results at FactBites »

 
 

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