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What should be the noise level in ideal op-amp?
Op-amp voltage noise may be lower than 1 nV/√Hz for the best types. Voltage noise is the noise specification that is more usually emphasized, but, if impedance levels are high, current noise is often the limiting factor in system noise performance.
Can ideal operational amplifier has?
An ideal amplifier has infinite input impedance, zero output impedance, and a fixed gain at all frequencies. An ideal op amp has infinite input impedance and zero output impedance, but has infinite gain. Real op amps come reasonably close to the idealization.
What to do when op amp reaches 0V?
Try putting a resistor in series with the inverting input of the OpAmp (i.e., between the common node R1/R2/R3/R4 and the inverting input. Use 10k or so to start. You can add another one to the non-inverting input if you care about offset at the output.
How does a capacitive load affect an op amp?
Op amps have an inherent output resistance, R o, which, in conjunction with a capacitive load, forms an additional pole in the amplifier’s transfer function. As the Bode plot shows, at each pole the amplitude slope becomes more negative by 20 dB/ decade. Notice how each pole adds as much as -90° of phase shift.
What is the op amp output of an ATmega328P?
As mentioned in the comments below, the circuit consists of ATmega328P processor driving 8 lines into an R2R DAC. The output of the DAC and a DC bias voltage intended to center the DAC output at 0V feed into an inverting TL071 op amp. The output of this op amp is “OA2OUT” in the schematic above.
What happens when phase margin of op amp reaches zero?
As phase margin approaches zero, the loop phase shift approaches -180° and the op amp circuit approaches instability. Typically, values of phase margin much less than 45° can cause problems such as “peaking” in frequency response, and overshoot or “ringing” in step response.