a value of “10Meg” becomes “10Meg noiseless”. In Figure 4, add “noiseless” to the value of R1 and R2 to see the noise from only U1. Low-noise design with LTspice is easy—just use “noiseless” to improve your design!
The figure shows an inverting amplifier repeated three times. Each instance uses one of the three functions. The time-domain plots show the differences in the outputs. RAND( ) is the top plot. The output is not smoothed and does not look like the “fuzzy” waveform we want. The mid...
This article outlines how to use Python and LTspice for noise analysis of mixed-mode signal chains in order to keep up with increasing application performance demands.
Figure 4 Experimentally observed noise induced synchronization, resulting phase plot and observed graph coloring solutions for various coupled oscillator networks (CC = 1pF). Full size image Finally, we evaluate using LT-SPICE simulations, the ability to extend this approach to solving larger grap...
在一般的 SPICE 仿真中,我们可以通过消除R_s带来的噪声来确定 F。为此,我们首先需要将公式 (8.37) 重写为 Example 8.11 使用 SPICE 和公式 (8.46),计算例 8.10 中电路的噪声系数(再次验证噪声系数为 11)。 同样,如例 8.5 所示,该电路的总输出噪声功率为1.5053\times10^{-14}V^{2}。如果我们模拟图 8.21中...
Figure 7. Interleaved inverting charge pump in LTspice. Figure 8. Output voltage ripple of an IICP vs. a regular charge pump: VIN= 12 V, ILOAD= 50 mA, CFLY= 2.2 µF, COUT= 4.7 µF, RON= 3 Ω. To make the comparison fair to the regular charge pump, its RONwas halved ...
I noticed your comments about the noise figure being optimistic for the 3910's. I noticed the same thing with the BF862's, so I had a tweaked model where I adjusted the noise figures to better match the reported numbers, a computer crash lost the model, but you could tweak the ...
In LTSpice, adding the mirror decreased the input referred noise, and it did not show a significant contribution from those transistors. That said, I am more confident in the accuracy (and relevance) of my measurements than I am of the simulation results. ...
. Figure 11 shows the dynamic transition between Pass-Thru mode and CCM operation. An LTspice simulation of this circuit along with sped up versions of the toughest ISO 16750-2 test pulses is available atanalog.com/media/en/simulation-models/LTspice-demo-circuits/LT82...
Figure 4 shows a suggested layout. Ground, VIN and VOUT are distributed in planes, minimizing impedance. The LT1613 GND pin (Pin 2) carries high speed, switched current; its path to the circuit's power exit should be direct and highly conductive at all frequencies. R2's return current, ...