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Reference Circuits

1.2 Volt Reference: National Semiconductor Application Notes,04-Nov-1995

Add an auxiliary voltage to a buck regulator: 10/31/2002  EDN - Design Ideas / You often need more than one regulated output voltage in a system. A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify (peak-detect) this output voltage..

Buck boost regulator suits battery operation : 09/04/03  EDN-Design Ideas / A buck/boost converter can step a voltage up or down. Such a converter is appropriate for battery-powered applications. One application derives a regulated 14.1V at 1A from 12V solar panels with 9 to 18V variation. In this type of battery application, efficiency is an important factor; hence, this design uses an inexpensive synchronous-rectifier-based MC33166/7 circuit....

Buck regulator operates without a dedicated clock : 08/21/03  EDN-Design Ideas / Most switching regulators rely on a dedicated clock oscillator to determine the switching frequency of operation. A dedicated oscillator circuit within the power controller usually generates the clock signal. A class of hysteretic switching regulators can actually operate at a relatively fixed frequency without a clock, even with changing input-line and output-loading conditions....

Buck Regulator Terminates Fast Data Buses: 07/20/95 EDN-Design Ideas

Buck Regulator uses Step up Controller: 11/09/95 EDN-Design Ideas

Circuit Measures Small Current in DC Servo Motor: 12/07/01 EDN-Design Ideas 

Circuit Measures Small Currents Referenced To HighVoltage Rails : 01/07/02 Electronic Design - Ideas for Design / Designs that need to measure small signals riding on high-voltage power rails suggest the use of isolation devices. However, a high-common-mode-voltage instrumentation amplifier used with a rail-to-rail input and output amplifier can recover the...  

Circuit provides reference for multiple ADCs: 01/24/2002  EDN - Design Ideas / The achievable accuracy for systems with multiple ADCs depends directly on the reference voltages applied to the ADCs. Medical-ultrasound-imaging systems, for example, commonly include a large number of ADCs in the system's beam-former electronics, with the ADCs usually organized in groups of 16, 24, 32, and so on. .

Circuit provides reference for multiple ADCs: 01/24/2002  EDN - Design Ideas / The achievable accuracy for systems with multiple ADCs depends directly on the reference voltages applied to the ADCs. Medical-ultrasound-imaging systems, for example, commonly include a large number of ADCs in the system's beam-former electronics, with the ADCs usually organized in groups of 16, 24, 32, and so on. .

Digital potentiometer programs and stabilizes voltage reference: 05/30/2002  EDN - Design Ideas / The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its digital controls provide programmability. You can use a digital potentiometer in two ways in an analog circuit. You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider..

For Just Pennies, Boost Current From Negatimve Linear Regulator : 11/25/02 Electronic Design - Ideas for Design / Adding four components to a negative linear regulator (U1 in the figure) increases the load current by 60%. The additional pass transistor and associated resistors cost less than $0.17 in 1000-unit...  

Get buck boost performance from a boost regulator: 07/11/2002  EDN - Design Ideas /  The SEPIC (single-ended, primary-inductance-converter) topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, The topology has some disadvantages, however. The efficiency of a SEPIC circuit fares worse than that of buck and boost regulators, and SEPIC desig....

IC Voltage Reference has 1 Ppm Per Degree Drift: National Semiconductor Application Notes,04-Nov-1995

Linear Brief 41 Precision Reference Uses Only Ten Microamperes: National Semiconductor Application Notes,02-Mar-1999

Measurement Circuit Features High CommonMode Rejection : 07/22/02 Electronic Design - Ideas for Design / Modern measurement systems often operate with single 5-V power supplies, yet their input signals may have large common-mode voltages that exceed the supply by tens or hundreds of volts. Also, unless the converter is driven differentially, the noise on...  

Micropower Voltage Reference: National Semiconductor Application Notes,28-Jun-1996

Obtain higher voltage from a buck regulator: 05/29/03  EDN-Design Ideas / Several semiconductor vendors'current-mode buck controllers have input-voltage ranges of 30 to 36V but have output-voltage ranges from the reference voltage to approximately 6V. This output-voltage constraint arises from the common-mode-voltage limitation of the current-sense amplifier. In real-world applications, the power-supply designer must be able to generate high output voltage for printe......

Positive regulator makes dual negative output converter: 06/26/03  EDN-Design Ideas /Some systems, such as optical networks, require more than one negative voltage. A common procedure is to boost the main negative supply of 5V to 10V and then reduce it with a linear regulator to 9V. The 5V itself comes from a positive supply, typically 5 or 12V. Independently creating each of the two negative voltages requires the use of two switching-regulator ICs...

Positive regulator makes negative dc/dc converter: 12/26/2002  EDN - Design Ideas / Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost dc/dc converters. Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regula

Reference stabilizes exponential current: 10/25/2001 EDN - Design Ideas / In an antilog converter, the difference between the base voltages of two 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. .

References for a / D Converters: National Semiconductor Application Notes,04-Nov-1995

Regulator Makes Dual Tracking Reference: 11/07/96 EDN-Design Ideas

Simple Regulator has one Active Part: 03/16/95 EDN-Design Ideas 

Supply delivers pin programmable multiple references: 05/01/03  EDN-Design Ideas / In the circuit of Figure 1, the REF01, IC1, is a buried-zener-diode-based, precision 10V reference that features minimal noise and drift over temperature. The circuit provides not only the 10V output of the REF01, but also a 5V output that a REF02 reference would deliver. In addition, the circuit provides 5 V 10V, and an unbalanced dual reference, the sum of whose voltages is precisely 10V...

Supply saves Circuits from lax Predecessors: 11/23/94 EDN-Design Ideas 

Two Acels Power Step Down Regulator: 01/07/99 EDN-Design Ideas  / PDF contains multiple circuits - scroll to find this circuit.

Ultra Low Drop Linear Regulator:

Voltage Reference improves JFET: 10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit





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