High frequency peak detector

The DP8464B from National Semiconductor is designed primarily for use in disk systems as a pulse detector. However, it can also function effectively as a general-purpose peak detector for analog signals up to 5 MHz. This integrated circuit can manage signals with peak-to-peak voltages ranging from 20 to 66 mV. The circuit incorporates a filter that maintains constant group delay characteristics to band-limit the signal. Typically, the -3 dB point for this filter is approximately 1.5 times the highest frequency of interest. Additionally, a differentiator network between pins 1 and 24 can be implemented as a simple capacitor or as a more complex configuration to effectively band-limit the differentiator response.

The DP8464B operates within a defined frequency range, making it suitable for applications requiring precise signal detection and processing. The integrated filter is crucial for ensuring that unwanted high-frequency noise does not interfere with the detection of the desired signal. By maintaining constant group delay characteristics, the filter ensures that phase distortion is minimized, which is essential for accurate signal representation.

The differentiator network, which can be configured between pins 1 and 24, plays a significant role in shaping the response of the circuit. A simple capacitor can be used for basic applications, providing a straightforward means of differentiating the input signal. However, for more complex applications, a more elaborate network may be employed to optimize the frequency response and improve the overall performance of the peak detection process.

In summary, the DP8464B is a versatile component suitable for both specific and general applications in signal processing. Its ability to handle low voltage signals while providing a reliable peak detection capability makes it an essential tool in electronic circuit design, particularly in systems where precise analog signal processing is required.National Semiconductor's DP8464B is primarily intended for use in disk systems as a pulse detector. However it can be easily used as a general purpose peak detector for analogue signals up to 5 MHz. The chip can handle signals between 20 and 66 mV peak-to-peak. The circuit includes a filter with constant group delay characteristics to band limit the signal. Typically the -3 dB point for this filter will be at about 1.5 times the highest frequency of interest. This differentiator network between pins 1 and 24 can be as simple as a capacitor, or can be more complex to band limit the differentiator response. 🔗 External reference