Current
Mirror Circuits
Last Updated on:
Friday, March 23, 2012 04:30 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Circuit drives mixed types and quantities of LEDs - 3-Oct-02
Issue of EDN 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.....
[Design Idea by Mark Pearson, Maxim Integrated Products, Sunnyvale, CA] |
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Circuit forms novel floating current-source - 1-May-03 Issue of
EDN Figure 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]..... [Design Idea by S Casans, AE Navarro, and D Ramirez,
University of Valencia, Burjassot, Spain] |
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Get just enough boost voltage - 27-May-04 Issue of EDN 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.....
[Design Idea by Kieran O'Malley, On Semiconductor, East Greenwich, RI] |
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