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15 Threads found on Bipolar Biasing
If you expect you'll often need a particular voltage, then it makes sense to have a fixed supply for it. Example, 5V, 3.3V, bipolar supply for op amps, etc. Other than that, I think it's more versatile to have a variable supply voltage. My homemade power unit has two variable supplies, each 0-16V.
Here is an explanation of biasing: Some more links can be found in
So - are you saying that you generally *do* use a biasing resistor from the non-inverting terminal? I generally don't use bias current compensation resistors with FET OPs or input current compensated bipolar OPs. Because most modern bipolar OPs have input current compensation, I effectively don't use it at all. In case of
In my opinion : bipolar and MOS Analog Integrated Circuit Design (Grebene)
biasing circuit is neccesary because input stage is differential pair ( probably bipolar) and that's why an amount of DC voltage is used to drive the bases of the input diff. stage.Otherwise it will not work.. But why it does not use its own bias network ?? There should be a reason.. I guess a pre-biasing voltage has been applied to speed (...)
As another source of uncertainty, you didn't specify resistor values or supply voltage. Also the OP type hasn't been said, not even FET or bipolar. But you are asking about neccessity of offset nulling. Ask meaningful questions and you'll get reasonable answers. For the time being, I assume, that no offset nulling is required, unless the circuit
Yes, negative current in the PMOS means the current flows from source to drain. In a bipolar amplifier you need to always keep the transistor turned on (unless you are wanting a class C type operation, for example) and the signal is usually superimposed on a nominal bias current. Reverse biasing the base-emitter junction will not allow you to d
Hi all, I would want to amplify a DC current from a generator provided by an op amp... I would want to use a bipolar transistor but I'm not familiar in biasing in "DC current amplification mode". The output current should be equal to 100mA. What kind of topology can I use ? and what kind of biaising should I use ? regards
Hi To me it looks like a bias circuit for a class A amplifier as it will make a "stiff" bias-point. You can adjust the base and collector voltage with the resistors. The idea is that it is stable against such things as temperature variations because it is self regulating the base-emitter voltage. bipolar transistors use more current as the te
Paul Brokaw formulated the following practical rule: if on the circuit diagram one can draw a closed line around the supply bus that crosses only drains of MOS devices or collectors of bipolar transistors, then such circuit has the second stable condition when all components are off . P. Brokaw, ?Bandgap reference design?,
Usually power consumption of CMOS analog circuit is calculated with multiflying current and voltage. bipolar will consume more than CMOS according to base driving.
what is: self-biasing and dynamic biasing in bipolar power amplifiers ? what is advantage of base vs. emitter ballasting in power amplifiers ?
One thing bothers me for a long time. I know that circuit deisgn based on CMOS process, we choose biasing current or voltage, the length and width of the MOSFET for the target performance. But for BJT process, what kinds of parameters are chosen for consideration?
You can find it on the internet. Or read the classical book. Grebene, Alan B., bipolar and MOS analog integrated circuit design, and Gray Paul R And Meyer Robert G, Analysis and Design of Analog Integrated Circuits
I simulate a bipolar circuit with eldo, and I find a very strange problem: when power supply rise from 0(0ms) to 10V(50ms), from the operating point, I found the current flow out a path didn't equal the current flow in the same path, because some current flow through the substrate, but the substrate is reverse biasing, why? Could some exper