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# Voltage Ref

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160 Threads found on edaboard.com: Voltage Ref

## How to increase the voltage of bandgap reference Vin?

Hello all, Could you tell me how I can increase the voltage of bandgap. Right now, the voltage operation Vin is from 2.2V to 4V. If I wanna increase voltage to 12V, how I do that ? Please show me the way to do it. Thank you so much. In the below, I attached some img about my bandgap136112

## Power supply questions - source to power the meters.

hi, The 7660 is there to provide the -5v. Have you seen this option,? E

## Microcontroller haults after some time

Such issues hard to figure out even with real time debugging. It can be everything. Stack overflow or h/w voltage spikes.

## IC LTC2410 24 bit ADC

I am trying to use 24 bit ADC LTC2410. I am applying the below voltages to LTC2410. Vcc: 3.3V ref+: +3.3V, ref-: Ground IN- is connected to Ground Should the maximum voltage on IN+ is 1.65? Why is it so? 2^24 = 16777216 bits. 3.3V = 16777216 bits 1 bit = 0.19nV. Is it right?

## Loop powered pulse output circuit.

@crutschow Your simulation is different due to the start time. change > simulation> edit simulation cmd> time to start saving data...> 0 The circuit power up has a 1ms power up rise time constant due to current and caps being charged up from initial supply power up from 0V. This controls the ref voltage out and thus the current envelope o

## TL431: Do i need to limit voltage reference input current?

You should not apply voltage to the ref input without also applying voltage to the cathode (through a resistor, of course). In normal operation the ref voltage is supplied from the cathode voltage (through a resistive divider if you want more than 2.5V out).

## Thermal Noise of MOSFET increases or reduces with its gm (W/L) ?

Hi, The thermal noise due to a MOSFET can be expressed by either a current source In (connected between the drain and source terminals), or by a voltage source Vn (at the gate): In? = 4kTγgm & Vn? = 4kTγ/gm So, to reduce noise, should gm (

## Setting Vout for an SMPS power module?

Hello This SMPS module appears to have a settable output voltage via its ?ref? pin which enables the user to set a voltage at the error amplifier reference input. However, when "Adaptive loop? mode is set, the datasheet says not to use the ?ref? pin. Why is this? Why can we not use the (...)

## RF Triode Amplifier - Filament Current Monitoring Circuit

hi, Looking over your circuit images, it says that the valve/tube circuit is simplified for clarity. I would assume that the ground return for the heaters is not directly connected to the common ground rail, but to ground via the 0.3R resistor. The monitoring circuit measures the voltage across the 0.3R ref attached image. E

## 50/100V DC/500mA Power Supply Circuit

Hello I have flyback for you that does this, just adjust the ref voltage into the external error amplifier as in the schematic. It is in the free download ltspice simulator here also provided. (you can run it by converting it to .asc) I made it DCM. Duty cycle of 0.6 at 85v on the dc bus, so as to reduce the reverse diode volts Excel desig

## What is the value of this capacitor'

For smd capacitors, 1E is the voltage code of 25V. ref : Perhaps it is a 22uF 25V capacitor.

## Overvoltage protection one chip solution?

I want to add over voltage protection to a 5.2V, 2.5A SMPS. I'm looking for minimum parts count and cost, the circuit could be a one time only type circuit. This device would be ideal if it had a slightly higher current rating: There is a higher current v

The reference IC isn't designed to sink current. Depending on the AD8226 common mode input voltage, you may want to add a load resistance to the reference output.

## Newbie question: Is it possible to design band gap voltage ref without BJT?

so my quiestion is: is it possible to design bandgap voltage reference without BJT? only using MOS transistors. if so, could you please give me a link to the solution

## How to charge an empty 6V VRLA battery?

A state machine with flip flops is simple to control these 3 states. plus Vbat present. Use a current sense R such as 75~ 100mV at max current. Use a band gap ref for controlling current , voltage and shutdown float, which is included in LM317, but using a linear regulator is very inefficient with heat sink required. Measure average current with

## design of a DC-DC solar to battery converter

hi, This is an example of the unit you require. What is the wattage of the solar panel.? Clip from link. Features: Size: 52mm x 38mm x 15mm(L x W x H ) (with fixed column) Input:

## Any trick to make a linear regulator go down to 3.3V instead of the ref voltage?

LT1083/4/5 all use Vref =1.250V , so Vo.min=Vref. If you want to regulate to 0V, you would need a V->=-1.25 to drive Vadj. Low current but stable voltage. No problem?

## Excitation Voltage and Rated Output of Load Cell

The load cell's required input power is not met by the ADS1232 ref Board's excitation power limits. The load cell wants 9V minimum where as the excitation voltage from ADS... is not more than 5.3V You need to give minimum of 9V for load cell to function properly.

## Dc245a-a nd eval board (ltc1668) no output

i need help to get output from dc245a-a (ltc1668) board.i interface it with DE1 SOC board. I did following steps but in vain 1)input digital voltages at dac pins yes 2)ref voltage and current correct yes 3)input supply voltages right yes 4)jumpers are ok yes 5)any sign board doesnot respond by removing digital (...)

## problem in using arrey & ADC using 16f777

hi, I have written following program to convert ten analog inputs to digital signals, and put appropriate output regarding to comparison with ref signal (not determined yet). we use pin Vref- and Vref+ (AN2 & AN3) as voltage reference and AN12 pin as external interrupt. when I use two dimensional signal (...)

## transistor vbe-ib curve

VCE(sat)=1.5 V Collector-Emitter Saturation voltage IC = 6A, IB = 600mA VBE(sat)=2.0 V Base-Emitter Saturation voltage VCE = 4V, IC = 6A ref Fairchild is silicon single stage transistor. When saturated, the diode has a linear characteristic VI load line. Choose

## In need of voltage regulator help. (Pass transistor)

Connect 2 Regulators in parallel with the same ref voltage.. Simple..

## Photodiode transimpedance amplfier

Depends on reference voltage , feedback , input polarity and offset OA inputs will always be 0V differential in linear mode. So choose a common mode voltage ref. that works with input stage. Since OTA basic design is inverting , you need a negative supply if not using mid-Vcc bias.

## Leave trim pin of 1v reference IC open is ok?

Hello, We don't need to trim the output of the ADR510 voltage reference (1v). Does this mean we can just leave this "trim" pin open? ADR510 datasheet

## what is the meant by negative voltage

Imagine the 12V, 9V and 5V are batteries. If the 12V and 9V batteries have their negative ends connected to Ground (ref point) and the positive ends would give you +12V and +9V. If you connect the positive end of the 5V battery to Ground, then the other end of the battery would give you -5V. The negative voltage are commonly used in op-amps an

## PIC C Compiler with built in functions

In the past I have used CCS C Compiler that has built in functions for just about anything that we might want to do. These include: RS232 I/O, SPI two wire I/O, Discrete I/O, Parallel port, I2C I/O, Processor controls, Bit/Byte Manipulation, Standard C Math, voltage ref, A/D Conversion, Standard C char / String, Timers, Standard C memory, Capture

## 16 MHz Clock Level Translator (3.6v to 1.8v)

Either use a logic gate that can accept higher input voltage, e.g. 74LVC1G34, or a voltage divider as most simple solution. If necessary compensated fot the load capcitance. It will be preferably placed directly at the load.

## LEM LTSR-6NP HALL EFFECT TRANSDCUER MEASUREING ac voltAGE

This Hall transducer uses a DC ref of 2.5 offset for the zero crossing current and also uses a step-down current transformer for sensing (2000:1 or 2000:2 or 2000:3 ratio select) with a sensitivity of 104.16 mV/A centered around 2.5V with 0 to 5V range giving a max range of +- 19.2 Apk Thus your AC current already converted to unipolar DC out wit

## Dropout controllable regulator

any solution is irrelevant without a current spec. otherwise you just need an Over voltage Protection circuit (OVP set at 40V.)

## Help: how to get a constant duty cycle output from comparator

Hi all, I am designing a comparator, the one input is dc voltage(ref voltage), and the other is square wave, what's worse, the low voltage of the square wave is varying. My problem is : how can I get a constant duty cycle output when the low voltage of the square wave is varying. Thanks for reply try LM339N

## Single supply active filter design with gain

That circuit won't work. What you call "ref" needs to be a low impedance, NOT a voltage divider. What is your input voltage?

## LED drivers have unusual components...what are they for?

Hello, Page 26 (PMP4026 Schematic) of the following features the output sense resistor voltage being divided down by R5 & R3. This seems like a bad you agree? Also, why are they using a 2Ohm sense resistor with 700mA of current?..surely too much dissipation, considering that the error amp ref voltage is just 200mV in the TPS40211.. h

## improved bandgap reference circuit design [help]

You have a PTAT voltage across R1. VPTAT = (KT/q)ln(m) This would fix the current in the PMOS current mirrors as a PTAT current, IPTAT = VPTAT/R1 Your Output voltage Vref = (IPTATR2) + VBE,q3 Now adjust R2 to get Vref as constant across

## regarding ldr sensor....

hi i am not familiar in pic. but generally, i will give some points, i hope you had correct initialization in adc code and no hard ware faults. first thing is, check the ref voltage of the micro-controller , second thing is, check the datatype of the ldr_val

## Differential Impedance

... I must find a way to shift the common voltage of the DAC in the acceptable range of 0.9 V to 1.3 V for transmitter. now I try the solution with the differential amplifiers. You'll need a reference voltage to manage this. With a ref. voltage of, e.g., 3.0V and input resistors of 100kΩ you'd get (...)

## Calibrating Digital Multi Meter with Voltage ref

the voltage calibration can be made on highly accurate lab powersupply, if your meter shows voltage , resistance in +/-2% accuracy then never go to touch that presets.you will never get the proper factory calibration. my advice is never touch that presets unless necessary.

You need to reduce input voltage and shift by 1V to avoid negative values. Shift input voltage by adding a DC source of 1V, so new range will be 0 - 4V and then add a divider with factor 2, so new range will be 0 - 2V; with these range value can go to MAX1415; in software code need to take account these operation (shift and scaling). ref+ (...)

## Using the atmel atmega 16 ADC

Hi 1) the reading on the ADC is Vinput / Vreference * 1024. If Vreference changes, then you obtain different readings with the same Vinput, and this in most cases unacceptable. You then have various choices: - use a good quality AVCC - use a reference voltage source connected to Aref - use the internal (...)

## how to simulate VCO phase noise sensitive to power supply

Do a pxf analysis and plot the outputs from the control voltage source (Signal) and the power supply (Noise). Look for the "-1" ref sideband to observe the frequencies that matter. Note their relative levels and model it as noise at the input of the VCO (or at the output) in the phase domain LTI model to see the closed loop phase noise profile whic

## Voltage: Ref. to ground with switch at position

Is ref just a point for measuring or connection to a circuit ? If ref is a point for measuring and if we assume diode is ideal thus we will be certain that voltage of this point is zero at B. however current of R1 is 1ma and current of R2 is zero.

## Bandgap frequency response

Hi all, I designed bandgap reference with the following specifications. Supply 1.2V ref voltage 600mV Power consumption <10uA temp coefficient <50ppm/C Design is completed and met above mentioned specifications. Now I am doing stability analysis. For this I chose .tran analysis with supply rise time as 1u. I am getting (...)

## Simple Low-voltage Circuit switch for 4.8V pack powering LEDs?

an op-amp whose input connected to a ref voltage provided by a zener and the voltage to be compared can do the function you require.

## i need ac 0 to 400v above pic voltmeter

You need to rectify the AC input to get a DC value that is going to be approx. the peak value of the AC input. As this value is very high, place a voltage divider to suit the range of the ADC inputs of the micro controller. Take care with the voltages that you are handling. The peak voltage will be more than 560v. Standard resistors do not (...)

## Intel G31 M/B no display problem

3 long Means for Ram section is failed or check ram vcc, ram spdvcc ref voltage. if these are good then 100% problem is your BIOS is Corupted. Because i face many time BIOS problems in Intel ORIGINAL Motherboards.motherboard no display problem all checked like ram , smps and checked monitor also checked post code on pci

## how to give input to test circuit of basic mixer???

hello everyone, i've been trying to simulate gilbert mixer in cadence 0.18um tech... while creating test circuit, i saw 'balun' is used in ref manuals. But balun is not giving proper differential outputs with some common mode voltage level,instead it is producing two entirely positive and negative signals. Does dis serves our purpose or do i n

## Driving data convertor AD7823 with an op-amp

Hello, I'm interested in using an op-amp to drive an AD7823 data convertor. Maximum gain required is about ~30, since I can use a ref voltage as low as 1.2V on the AD7823. Required bandwidth operation is 100KHz. I have no requirements on the op-amp except that th

## how can I filte the shifted voltage

if the ref voltage is divided by two 100k resistors and the input signal is 1v reference to the ref,so how can I get a real 1v reference to the GND? 80336

## DDR failure in Evaluation module?

Hi In EVM814X,the DDR is failed.. I have checked for the supply voltage and ref voltage and clock ,they are fine. Still i m not able to read or write in memory.. What may be reason??:!::!::!: thanks

## micontroller ADC to voltage conversion

You can convert the reading to a voltage (ref_volt / AD_Resolution) * AD_result. In the case of 12-bit resolution and 2.5 ref. (2.5 / 4096) * 1630 = 0.9948; The ref voltage must be changing when you switch power supplies.

## HV991 Boost LED driver......setting source and output current with same divider.

Hello, In HV9911 boost controller, the source current sense reference voltage and the output current sense voltage are set bu potential dividers from the ref pin. But can we use the same divider to input into both Iref and CLIM pins? ...the datasheet unfortunatley does not say what is the bias (...)