Advantages and disadvantages of voltage divider bias

The voltage divider bias is a transistor-based voltage separating circuit network, these circuits are also known as emitter current bias.

The figure shows the simple demonstration of the voltage divider bias circuit, it is the most widely used type of bias circuit with a single power supply, in which the current is the small component of the current in R2 (stiff voltage divider).

Advantages of voltage divider bias

• The resistors help us to give complete control over the voltage and current that each region receives in the transistor.
• More than one type of voltage divider circuit can be incorporated by making use of this bias.
• It is the most ideal and most widely used technique.
• They allow us to obtain the voltage needed from a higher voltage source.
• They allow for a drive source with a higher impedance to work into.
• It is the simplest way to measure voltage variations by dividing them and measuring them by small portions of large voltage values.
• The frequency is varied by net value.
• Less noise operation
• The feedback ratio is constant
• Fast transient response
• And the RE (emitter resistor) allows us the stability of the gain of the transistor, despite fluctuating the ᵦ
• It is a simple circuit arrangement
• Biasing conditions are set easily
• No loading effect as no resistor is present at the base-emitter junction.
• The circuit provides some stabilization.

Explanation for the advantage of voltage divider bias

Simple circuit arrangement

The voltage divider bias circuit arrangement is very simple, a single transistor and four resistors are been used.

They help us to obtain voltages from higher voltage sources

The voltage divider bias support obtaining voltages from the higher voltage source, this is the main advantage of this circuit.

Less noise operation

The operation based on this circuit did not support noisy operations.

The simplest way to measure voltage

The voltage divider bias circuit is the easiest way to measure voltage variations, this is done by dividing the total voltages into parts to measure the whole voltage value.

Disadvantages of voltage divider bias

• The signals tend to get mixed while using this bias in the circuits.
• Measuring accuracy only depends on the components used to divide the voltage.
• The voltage divider method has slit power losses.
• The ratio may be again affected by voltmeter resistance, which adds up to uncertainty.
• The capacitance divider has very close tolerance and individual values.
• Low efficiency
• High power dissipation
• High stability factor
• They need more resistors.
• Thermal runaway is possible at them.
• They don’t allow faithful amplification
• The circuit provides negative feedback.

Explanation for disadvantages of voltage divider bias

Signal mixing

The signal mixing is possible at the voltage divider bias circuit, this is because the division of the signal is done into three or four parts. But at the circuit, there is no provision to limit and control the signals.

Measuring accuracy

The measuring accuracy depends on the components used in the circuit, in this circuit transistor is the main component and four resistors are the driving component.

Power losses

The voltage divider bias circuit has power loss due to the usage of resistors and also they are dealing with high voltage values.