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1 Hz to 100 MHz VFC Features 160 Db Dynamic Range: 09/1/05 EDN -- Design Ideas / (Schematic / circuit added 10/05) Transform voltage to current
over wide frequency, amplitude. |
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40 Volt Current Source Operates From 40 to
+85°C: 06/22/1995 EDN - Design Ideas / (circuit added 7/02) Wide-output-current-range sources that accommodate
a wide supply and temperature range require special consideration. The basic circuit of ( Fig 1) provides IOUT = VREF/RS; typically, VREF is
1.25V for the LM317L family. The LM317LZ is rated for 0 to +125°C; for lower temperature ranges, the LM317LBZ could be used (-40 to +150°C
rating), but it is more costly and harder to obtain |
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60 MCurrent Source Feeds Telecomm Lines: 12/12/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) |
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A Simple Current-Sense Technique Eliminating a Sense Resistor (AN-7): Application Note 7 from Microsem (Circuit / schematic design added 6/06) |
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Amplifier and Current Source Emulate Instrumentation Amplifier: 11/13/03 EDN Design Ideas / (added 12/04) The classic three- or two-op-amp instrumentation-amplifier
circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise. In some applications,
the signal source is floating with high-series-output impedance and thus requires an appropriate high-input-impedance amplifier.... |
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AN-1244: Photo-Diode Current-To-Voltage Converters: National Semiconductor - Application Note (added 2/06) |
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AN-240: Wide-Range Current-To-Frequency Converters: National Semiconductor - Application Note (added 2/06) |
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AN-D16: Lnd1 Series: Constant Current Sources And: Supertex Semiconductors (app note added 2/06) |
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AN-D18: Dn25 Series: Constant Current Sources And: Supertex Semiconductors (app note added 2/06) |
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Basic Current Source : Circuit Ideas
for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
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Bipolars Provide StableCurrent Source: 09/24/98 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) |
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Buffered Current Source: Circuit
Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
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Cascode Current Source : Circuit
Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
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Circuit Forms Novel Floating Current Source: 05/01/03 EDN Design Ideas / (added 1/05) 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).... |
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CMOS Buffer Delivers Precise Current Pulses: 12/08/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) The circuit in Fig 1 delivers stable, fast-settling
reference-current pulses. You can use the circuit in systems employing A/D, D/A, or V/F converters. Digital input pulses, VP, connect to IC3B,
a 74AC240 buffer. The 5.00V reference, IC1, constrains IC3B's output, VR, to either VREF or 0V. IC3B's rise and fall times are 3 nsec.
Resistor R1 converts the voltage at the output of IC3B to a current: IR=VR/R1. IR flows into integrator IC4's virtual ground....
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Constant Current Amplifier : (added
6/03) |
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Constant Current Battery Charger:
(circuit added 7/02) |
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Constant Current Constant Voltage Converter Drives White LEDs: 09/02/04 EDN Design Ideas / (added 1/05) LEDs usually take their drive from a constant dc-current source to
maintain constant luminescence. Most dc/dc converters, however, deliver a constant voltage by comparing a feedback voltage to an internal
reference via an internal error amplifier. The easiest way to turn a simple dc/dc converter into a constant-current source is to use a sense
resistor to convert the output current to a voltage...... |
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Current Regulators: I have been asked a couple times about
constant current regulators. Here are a couple simple ones. Set R2 on
both circuits for 0.6 volts at the desired current. Select Q1 and select
R1 according to the amount of current you would like to source or limit.
(circuit added 9/07) |
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Current Source Allows Measuring Three Wire Rtd: 07/06/00 EDN Design Ideas / (added 2/06) |
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Current Source and Sink Circuits Have Low Tc: 07/04/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) |
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Current Source Enables Op Amp's Output to Go to Ground: 09/05/04 EDN Design Ideas / (added 1/05) The LM324 is a cost-effective choice for an op amp, especially
when you need to apply ground-level inputs. Although its output purportedly includes ground, its poor current-sinking capability limits the
applications. At output voltages lower than 0.5V, the op amp's sinking current ranges only from 2 to 100 µA.... |
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Current Source Forms Unusually Simple Regulator: 09/12/97 EDN-Design Ideas / (added 01/05) -- Simple regulator uses a switching current source to drive a pair of
shunt Zener regulators, circuit produces ±15V dual outputs, for total output power of approximately400 mW form100-400-Volt DC source |
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Current Source has High Compliance:
09/01/00 EDN Design Ideas / (added 2/06) |
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Current Source has High Output Impedance:
06/22/00 EDN-Design Ideas / (Schematic / circuit added 10/05) |
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Current Source Mirror: Circuit Ideas
for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
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Current Source Multiplication:
Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
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Current Source with Gate Control:
Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic design added 6/06) |
