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Last Updated: December 31, 2017 06:47 AM


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Circuit drives mixed types & quantities of LEDs -  10/03/02 EDN-Design Ideas Portable systems often use LEDs of different colors and in varying quantities of each color.  Some examples are white for the display backlight, green for keypad illumination, and red for power.  Typically, the LEDs derive power from at least two power supplies  one for "standard" LEDs(red and green] and one for white LEDs__ Circuit Design by Mark Pearson, Maxim Integrated Products, Sunnyvale, CA

Circuit Forms Novel Floating Current Source -  1-May-03 EDN-Design Ideas One-shot provIdeas frequency discriminationFigure 1 shows a polarization circuit applicable to ISFET(ion-sensitive field-effect-transistor] sensors.  ISFETs are solid-state chemical sensors that measure the pH value of a solution in biomedical and environmental applications, for example.  The circuit in Figure 1 is extremely simple; it sets fixed-bias conditions for ISFET sensors(VDS=I0 RX; IDS=I0]__ Circuit Design by S Casans, AE Navarro, and D Ramirez, University of Valencia, Burjassot, Spain

Drive mixed types & quantities of LEDs -  10/03/02 EDN-Design Ideas Portable systems often use LEDs of different colors and in varying quantities of each color.  Some examples are white for the display backlight, green for keypad illumination, and red for power.  Typically, the LEDs derive power from at least two power supplies  one for "standard" LEDs(red and green] and one for white LEDs__ Circuit Design by Mark Pearson, Maxim Integrated Products, Sunnyvale, CA

Get just enough boost voltage -  27-May-04 EDN-Design Ideas Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltage and to ensure a constant difference between the input and the output voltages(Figure 1).  This circuit is useful for high-side-drive applications, in which a simple voltage doubler is unacceptable because of the voltage range of the components involved or where the input voltage can vary__ Circuit Design by Kieran O'Malley, On Semiconductor, East Greenwich, RI

Novel Floating Current Source -  05/01/03  EDN-Design Ideas One-shot provIdeas frequency discriminationFigure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor] sensors.  ISFETs are solid-state chemical sensors that measure the pH value of a solution i__ Circuit Design by S Casans, AE Navarro, and D Ramirez, University of Valencia, Burjassot, Spain


Current Mirror Circuits


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