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# Biasing Circuits

60 Threads found on edaboard.com: Biasing Circuits

## Ic package ground plane

Inside an IC package, what is the purpose of ground plane. Is it connected to the backplane of substrate for biasing it. Is it useful only in high frequency RF circuits or required for low frequency analog and digital circuits also.

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

If you look at the equivalent schematic shown in the datasheet directly below the functional block diagram, you surely understand how a high reference input current can be generated - by forward biasing the Ref-Cathode (base-collector) diode. This won't happen in a typical application, e.g. the datasheet reference circuits, but can happen under ci

## Vref, Bias and Vint part of circuit. what are their voltages?

There is a biasing/reference voltage generator in it and resistor is used to define internal bias current in the IC.Cap has been used to get a stability due to feedback nature of these kind of circuits.These voltages should normally be expressed in its datasheet.If not, you have to follow recommended values as are..

## Circuits for high voltage to ADC reading. Problem with simple voltage divider

You over complicate it! The output voltage of that circuit can never go negative because there is no negative voltage supplied to it, however, by biasing the + (non-inverting) input at half supply voltage, you have offset the output by 2.5V even when there is no input voltage. I think you are mistaking voltages below 2.5V as being negative. Howeve

## 3 phase input supply to adc

I presume it's a pseudo-differential ADC input that requires positive common mode voltage on the differential pins. So additional biasing circuits are needed. Preferably buffer amplifiers should be used. You also didn't tell if you want to measure the instantaneous input voltage with respective fast sample rate or use an analog circuit to conve

## Biasing Voltages and What circuits do you have to do biasing for?

What circuits or tests do you have to do biasing for? Can you give examples or list circuits that you have biased or done biasing for? I don't get the difference between a DC voltage and a biasing voltage, what is the difference? When measuring voltages with a DVM meter, how do you know if its a DC (...)

## ISCAS Benchmark simulation in HSpice

I want to add an complex biasing circuit and a switch to Iscas benchmark. Simulations have to be run in HSpice. I am not able to find a way to add these circuits to the benchmark. Could anyone please guide me.

## What is the difference between these two designs?

collector current depends on the base biasing as well as collector series resistor

## Need Help with derivation of biasing circuits for opamp

Hi Guys!! I am new to Analog IC design. Could some one please help me with derivation of biasing circuits for a complementary differential pair input for a rail to rail operational amplifier. (Please see the attached .jpg for reference ) Thanks! Saoni

## biasing a diode detector

All shown DC-biasing circuits can be used. The purpose of DC bias is to operate the P/N or Schottky junction at the best point where then open/closed" ratio offers the best rectification of RF input signal. Some circuits leave the DC-bias voltage at the DC or video output. THe best solution is to use a pair of detector diodes connected to (...)

## Common-emitter biasing on an IC

Hi all, New here, recently discovered the resource. I have a question about biasing a common-emitter amplifier on-chip. I've done a good few audio amplifiers with op-amps or discrete transistors, and there a four-resistor network works well. However, I've now started working with Cadence for M.Eng research, and I've been trying to get a si

## low noise amplifier at ku band

Dear pujithakaza, There is no proper methodlogy for Microwave frequeny biasing ckt, you have randomely vary the resistors, will get the desired Vds and Ids. Because scatering parametes we don't have any method such that in the low frequency biasing circuits. Randomely you choose any biasing ckt such that (...)

I think the following link should be gives various biasing circuits which provide the right voltage at the gate without the extra threshold voltage which comes with the basic current mirror which gives headroom issues. To

There are many kinds of biasing circuits. Some are using transistors. Generally, the question text doesn't seem to fit the title. Try a clear question, preferably with a cicruit example clarifying the topic.

## Design of Current mode differential amplifier

I wanted to design an current mode operational amplifier with differential input and differential output as a part on my project. I have referred a few papers for the same but what I find missing in the papers is the biasing circuits required for the current mode op-amps. I need any reference that can provide me help with the biasing (...)

According to this paper a dual gate mosfet has significant advantages over common transistors and mosfets. It seems that information on the internet is quite limited. Any information about biasing, characteristics, examples in circuits will be valuable.

## Introducing DC shift/Offset to AC input : Trouble

I have designed a white noise generator. the o/p is very low, so i used amplifiers to take the level upto mV. I also need to incorporate a dc level to the o/p. I used many circuits for this prupose, but no dc shifting. I tried simple voltage divider, opamp ( Non-inverting ac coupled) biasing etc etc, result is same : no biasing. Here is (...)

## Leakage current in MOSFET

At 90 nm, reverse bulk diode biasing will reduce leakage during standby modes. Obvious other alternative is to power gate circuits not in active clocking. You can also employ dual threshold process option. Low threshold devices for speed, higher threshold for low leakage. You can combine the later two to transfer high speed memory to low leakag

## Confusion with biasing circuits (BJT)

Hello experts! I was studying biasing circuits i.e. voltage divider bias, base bias, emitter bias, and both feedback biasing circuits i.e. collector feedback bias and emitter feedback bias. Analysis of all these biasing circuits are so confusing. In voltage divider bias, base circuit (...)