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51 Threads found on High Bandwidth Opamp
Your opamp is very simple and is missing a voltage gain stage so its voltage gain will be low. Its supply voltage and operating current are extremely low. Its bandwidth and slew rate are very high for an opamp. The resistor values must be fairly low for operation at the VHF frequencies due to stray capacitance, but the (...)
Yes, Vgs can be less than Vth. Making them in the sub-threshold region has higher gm/id, more power efficiency and higher gm, which is good for noise minimizing and matching. If you want very high bandwidth, you need to make it in the saturation region, making Vgs > Vth.
Hi, I wanna build 2-stage opamp with feedforward compensation. Let me start with the basics: Let's assume I have two ideal transistors with intrinsic gains a1,a2 and certain GBW1,GBW2. Let's assume both parameters are comparable and I connect them in series then I have gain a1*a2 and bandwidth sqrt(sqrt(2)-1)*GBW1 = 0.64*GBW1. Nothing will be
1/RoCo is not the op amp bandwidth unless the load is dominant. Not a good way to bet. Often the BW is set by internal compensation in unity-gain stable or "gain of X stable" op amps. Because voltage mode op amps want high stage gain and low power, Ro is made high and current made low (Ro is maximized at low current, and low current is (...)
You do not make the output resistance "more bigger" (higher). Instead for more gain you make the negative feedback resistance higher. An opamp has a frequency compensation capacitor to reduce the gain at high frequencies so that its phase shift does not cause oscillation when negative feedback is applied then at (...)
Do you know how to build a low power linear voltage to current converter? The voltage to current conversion needs to to very high precision, like 10bit resolution. This opamp based V/I is good, but the opamp will consume large power consumption. Since I need a fast response Voltage to Current, the opamp needs to be large (...)
Two stage opamps are normally used to enhance the gain of opamp as one stage can not provide high gain. However, there is a compromise, higher the number of stages, higher the number of parasitic poles, Therefore, it is more difficult to stabilize the opamp and to have wider unity gain (...)
Hello. While reading comments about a circuit on a site a short talk about the usable frequency range of the meter circuit, and someone said that TL074 should work to about 2MHz(slew rate = 13/?S) and that using AD843 which has a slew rate = 250V/?S would increase the bandwidth to 20MHz. I don't understand the relationship or how to do the n
An LM386 is a power amplifier designed to drive a speaker. Its output noise (hiss) is probably too high for it to be a mic preamp. Use a low noise audio opamp instead. A telephone has a narrow bandwidth because 138 years ago that was the best they could do. It cuts the natural low frequencies of an adult male voice (my voice is not deep but (...)
The bottom limit is defined by noise. If you measure a DC voltage, check the opamp 1/f noise and use a low-pass filter to limit noise bandwidth. You also have to define the input impedance to refer the noise power and voltage. The higher the imedance, the higher the noise level. If you refer to audio frequency range, then (...)
I've gone a little outside my area of expertise in a section of a circuit I'm working on, and I'd be grateful for some advice. I need to boost the current drive of a voltage source to power an array of LEDs. Requirements for the circuit are: Input: range as needed, nominally 1V to 3V, frequency DC to 5MHz; high impedance (direct from DAC or wave
That's ideal condition, Op-amp 741 has input resistance of 0.3M Ohms max. bandwidth of 1.5 MHz only, and slew rate of 0.5. You find still more high resistance, bandwidth, slew rate and ver low output impedance in still different op-amps. The ideal conditions are defined to measure op-amp's max conditions, but in practical these are very for (...)
hello, by high resolution you mean bandwidth ?
I am suppose to design a folded cascode opamp with considerable gain and high bandwidth with low power. (1.2V and 300uA total current). I am new to designing. Kindly anyone suggest me some papers or materials or books on the folded cascode design procedure.
Hi, I am a novice analog designer. I am going to design an opamp for bandgap application in 130nm technology. My opamp should have high gain good bandwidth low offset low power. Maximum on current is 5uA for entire bandgap I have chosen two stage miller opamp. 1. How shall i choose my bias (...)
When V2 is higher than V1, it leads to more current flowing thru the left branch and more current flowing thru M4. It will pull high Vo
To achieve the highest gain bandwidth, which one is more reasonable, multistage(3 stage) or gain boosting with 2 stage?
Hai, I am using opamp LF356 as high gain amplifier with gain upto 1000 with +16 and -16 volts as powersupply to the IC. I want to amplify the input DC transient of voltage 10mv to 100mv maximum. When the gain is changed from 1 to 1000, I found the signal in CRO is total distorted. At Gain of 1 to 100, when the signal view in CRO of 5mv/div or
If you intend to calculate the W/L values that will make your circuit work as you want, forget it. That's just impossible because you lack the exact equations and the math would be extremely difficult. If your designing an high speed opamp your transistor sizes should be as small as possible to keep a good bandwidth. Besides that, PMOS (...)
A lousy old opamp like a 741 is extremely noisy when it has high gain even when the high gain reduces its bandwidth. Some of the noise is "popcorn" noise at very low frequencies. There are many better low noise opamps available today.