AS1703

Linear- Amplifiers – Audio

The AS1703 is an audio amplifier that is designed to operate in a linear fashion, amplifying a small DC or AC signal and outputting a much larger signal with the same shape as the input. Its design is particularly well-suited to amplifying audio signals, allowing it to achieve high levels of fidelity with minimal distortion.

The AS1703 comprises two sections, the preamplifier and the output stage. The preamplifier is used to clean up and shape the input signal, while the output stage is responsible for producing the amplified output.

Preamplifier Working Principle

The preamplifier works by increasing the voltage range of the input signal before it is passed onto the output stage. This ensures that the output stage is able to work effectively, producing an amplified output with minimal distortion. This is achieved by a combination of a high pass filter, an adjustable gain and variable direct current gain.

The high pass filter removes high frequency noise from the input signal. This helps to prevent any unwanted noise from entering the output stage, ensuring that the output is of high fidelity. The adjustable gain allows the user to adjust the amount of gain applied to the input signal, allowing them to tailor the output to their requirements. The variable direct current gain ensures that the output quiescent current is accurately controlled, helping to maximise the efficiency of the amplifier.

Output Stage Working Principle

The output stage works by amplifying the signal from the preamplifier to the desired output level. The gain of the output stage is determined by its design, with the AS1703 featuring adjustable output current and an adjustable output voltage. This allows the user to fine tune the output signal to their exact requirements.

The output stage also contains two buffers that are used to ensure that any sudden changes in the input signal do not affect the output. These buffers also provide additional voltage gain, allowing the user to tailor the output to their requirements. Finally, the output stage also contains a large output capacitor, which helps to stabilise the output and reduce any transient effects.

Application Field

The AS1703 is an ideal choice for a wide range of audio applications, such as amplifying sound for public address systems, amplifying TV and radio signals, or creating high fidelity audio for home use. It is also well suited to more specialized applications such as powering instruments, amplifying ultrasonic signals, or providing precision power for audio test equipment.

The AS1703 is a popular choice due to its power efficiency, allowing it to produce a lot of output power while using very little energy. Its high fidelity performance also makes it a great choice for applications which require accurate reproduction of audio signals.

Conclusion

The AS1703 is an ideal choice for applications in linear audio amplification. Its high fidelity performance allows it to accurately reproduce audio signals with minimal distortion. Its combination of a preamplifier and output stage also ensures that the amplifier is able to produce a high quality amplified output with minimal power consumption.