# Generating Identical Voltage Signals w/ a BJT Circuit

• jordan.nc
In summary, the conversation was about generating two identical voltage signals using a BJT circuit. The suggestion was to use a split load phase inverter where the collector and emitter resistors are equal, but the gain will be slightly less than unity due to the emitter resistance. Another suggestion was a bootstrapped-emitter follower circuit where no current flows through the feedback resistor, allowing for identical signals in phase and amplitude to be obtained.
jordan.nc
Hi guys..how do u generate two identical voltage signals using the simplest BJT circuit?appreciate any help...

Do you mean two identical voltage signals that are out of phase by any chance? In that case the simplest circuit using a BJT would probably be a split load phase inverter where both the collector resistor and emitter resistor are equal. The gain will be a little less than unity though because of the emitter resistance, and the output impedances will be different, the zout at the collector will be approximately the collector load resistance, and the zout at the emitter will be the source impedance divided by the transistor beta +1.

well i wanted two identical voltage signals..identical in phase and amplitude...i kinda figured it...used a bootstrapped-emitter follower circuit...no current flows thru the feedback resistor...so identical signals can be obtained...

## 1. How does a BJT circuit generate identical voltage signals?

A BJT (Bipolar Junction Transistor) is a semiconductor device that can be used as an amplifier or a switch. In a BJT circuit, the base-emitter junction acts as a diode, allowing a small base current to control a larger collector current. By using multiple transistors in parallel, the same base voltage can be applied to each transistor, resulting in identical voltage signals at the collector terminals.

## 2. What is the purpose of generating identical voltage signals in a BJT circuit?

The purpose of generating identical voltage signals is to ensure that all transistors in the circuit are operating in the same conditions, resulting in consistent and accurate amplification or switching of the input signal. This is especially important in precision applications where small variations in voltage can greatly affect the performance of the circuit.

## 3. Can a BJT circuit generate identical voltage signals for both AC and DC signals?

Yes, a BJT circuit can generate identical voltage signals for both AC (alternating current) and DC (direct current) signals. The base voltage can be adjusted accordingly to produce identical voltage signals at the collector terminals, regardless of the type of input signal.

## 4. What are the potential drawbacks of using a BJT circuit to generate identical voltage signals?

One potential drawback is the need for precise matching of transistors in order to achieve truly identical voltage signals. This can be challenging and may require additional components or adjustments in the circuit. Additionally, BJT circuits may have limited bandwidth, which can affect the accuracy of the generated signals at higher frequencies.

## 5. Are there any alternative methods for generating identical voltage signals besides using a BJT circuit?

Yes, there are alternative methods such as using operational amplifiers (op-amps) or digital circuits. Op-amps can provide precise and consistent amplification of signals, while digital circuits can be programmed to generate identical voltage signals. However, these methods may require more complex circuit designs and may not be suitable for all applications.

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