Current_Source_Sink_Circuits
60 MCurrent Source Feeds Telecomm Lines: 12/12/97 EDN-Design Ideas
BiPolars Provide StableCurrent Source: 09/24/98 EDN-Design Ideas
Circuit forms novel floating current source: 05/01/03 EDN-Design
Ideas / 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)....
CMOS Buffer Delivers Precise Current Pulses: 12/08/94 EDN-Design Ideas
Current Source has High Output Impedance: 06/22/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest / Composite10-mA current-source configuration that
has a compliance voltage of5 to42V, a set-current error of less
than1% and an output impedance of greater than100 megaohms HAVE
TO LOG IN TO RETRIEVE CIRCUIT
Design Formulas Simplify Classic V/I Converter: 01/20/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
Digital current source is nonvolatile: 02/07/2002 EDN -
Design Ideas / Digitally programmable current sources that
feature automatic trimming and retain the setting despite
power-down cycles are useful in applications such as RF- and
laser-communications drivers. The circuit in Figure 1, for
example, is particularly suited for setting the drive current
for the optical pump in widely tunable VCSELs (vertical-cavity
surface-emitting lasers). .
High Speed Regulator Makes great Current Source: 07/16/98
EDN Design Ideas -- Bandwidth of this circuit measures more
than1 MHz, only the selected MOSFET and the ratings of the input
supplys bypass capacitors limit the voltage compliance
Linear Constant Current LED Lamp Dimmer: This circuits drives24 white light LEDs with an adjustable constant current.
PC Controlled Current Source Supplies 100V, 1A, 16Bit Pulses
: 04/29/02 Electronic Design - Ideas for Design / The current
source shown in the figure is designed to support toroidal-cavity
nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements
of molecular electrical mobility in chemical samples. To do
so,...
Precision Current Sink Costs Less than $20: 03/13/98 EDN-Design
Ideas / Simple active load circuit for current from1 mA to1A and
voltage from3 to40-Volt
Reference stabilizes exponential current: 10/25/2001 EDN -
Design Ideas / In an antilog converter, the difference betw1een
the base voltages of tw1o transistors sets the ratio of their
collector currents: The use of matched transistors balances the
first-order temperature coefficient but leaves a
temperature-dependent gain term, q/kT. Classic antilog circuits
use a thermistor in the drive circuitry to correct this
temperature dependency. .
Simple Current Source & Sink Circuits have Low TC: 07/04/96 EDN-Design Ideas
Simple High Efficiency Current Source Is Adjustable:
04/28/03 Electronic Design - Ideas for Design / IOccasionally,
the need arises for a simple current source that can be easily
adjusted over a relatively wide range of current levels. The
circuit shown in the figure uses a 200-kHz pulse-width
modulation... —
Simple Scheme keeps Current Drain Constant: 04/12/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
Step up / Step Down Current Source Charges Batteries: 07/16/98 EDN Design Ideas
Stepup/stepdown Current Source Charges Batteries: 06/05/96 EDN-Design Ideas
Voltage to current converter drives white LEDs: 06/27/2002
EDN - Design Ideas / You sometimes need to drive a white LED
from one 1.5V battery. Unfortunately, the forward voltage of a
white LED is 3 to 4V. So, you would need a dc/dc converter to
drive the LED from one battery. Using the simple circuit in
Figure 1, you can drive one white LED or tw1o series-connected
green LEDs, using only a few components..
Voltage To Current Converter Works From Single Supply Rail: 02/17/03 Electronic Design - Ideas for Design / Voltage-to-current converters feeding to grounded loads often find their way into industrial measurements and control applications. The conventional textbook circuit needs both positive and negative-supply rails
