Author Archives: Adam

Low Drift Sample and Hold

Posted on February 11, 2010 by Adam
Low Drift Sample and Hold

This is a circuit of low drift sample and hold. This circuit uses two JFET, Q1 and Q2 that provides the sample and hold capacitor, C1. Q1 provides a path, Rds(on), for C1 and turned on during sample. Q2 IGSS … Continue reading →

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Wide Input-Voltage Range High-Power LED Driver

Posted on February 11, 2010 by Adam
Wide Input-Voltage Range High-Power LED Driver

This is a wide input-voltage range high-power LED driver circuit. This circuit based on a buck/boost converter controller regulates current to a white LED. This circuit can be used to replace incandescent bulbs, it efficiently match the LEDs to available … Continue reading →

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A 20-kHz, Third-Order Low-Pass Filter

Posted on February 9, 2010 by Adam
A 20-kHz, Third-Order Low-Pass Filter

This is a third order low pass filter that has corner frequency of 20kHz. It is twice as high as the auto-zero clock frequency. Here is the circuit : The input signal operation is allowed to across its entire gain … Continue reading →

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