Infrared Receiver Circuit

The circuit operates from a 5-V supply and has a current consumption of 2 mA. The output functions as a current source that can drive or suppress a current exceeding 75 mA with a voltage swing of 4.5 V. The Q-killer circuit is implemented to eliminate distortion of the output pulses due to the decay of the tuned input circuit at high input voltages. The input circuit is safeguarded against signals exceeding 600 mV by an input limiter. The typical input is an AM signal with a frequency of 36 kHz.

The described circuit is designed to function effectively within a 5-V power supply environment, drawing a modest current of 2 mA. The primary output feature is a current source capable of handling currents greater than 75 mA, with the ability to maintain a voltage swing of up to 4.5 V. This characteristic makes the circuit suitable for applications where precise current control is necessary, such as in audio or RF signal processing.

A critical component of this design is the Q-killer circuit, which serves to mitigate distortion in the output pulses. This distortion can arise from the decay characteristics of the tuned input circuit, particularly when subjected to high input voltages. The Q-killer circuit effectively stabilizes the output by ensuring that the pulse shape remains consistent, which is essential for maintaining signal integrity in high-frequency applications.

Protection against excessive input signals is provided by an input limiter, which ensures that signals exceeding 600 mV do not damage the circuit or lead to erroneous output behavior. This feature is particularly important when the circuit is used in environments where input signals can vary significantly, such as in AM signal processing, where the typical operating frequency is around 36 kHz.

Overall, the circuit's design incorporates essential features for robust performance in signal processing applications, ensuring both current control and protection against signal anomalies. The combination of a current source output, Q-killer circuit for pulse distortion reduction, and an input limiter for signal protection makes this circuit versatile and reliable for various electronic applications. The circuit operates from a 5-V supply arid has a current consumption of 2 mA. The output is a current source that drives or suppresses a current of more than 75 with a voltage swing of 4.5 V. The Q-killer circuit eliminates distortion of the output pulses because of the decay of the tuned input circuit at high input voltages.

The input circuit is protected against signals of more than 600 mV by an input limiter. The typical input is an AM signal at a frequency of 36 kHz.