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106 Threads found on Signal Stability
Can be large signal behavior of the compensation circuit, e.g. if the first stage goes into saturation during slew rate limiting. Most commercial OPs are designed in a way that these unwanted effects are avoided.
If frequency stability is an objective, you'll use separate oscillator and power amplifier stages. Most 27 MHz power applications are required to use 27.12 MHz ISM band and keep the +/- 163 kHz bandwidth strictly. In addition, crystals are small signal devices and will be damaged by high voltage levels. Having high output voltage in a single st
I presume you mean ADS with "EM simulation". It offers a combination of analog circuit and EM simulation. ADS can be expected to give more precise results in large signal analysis of amplifiers compared to small signal AC analysis of a SPICE tool. But stability results should at least roughly agree. Otherwise one of both analysis is probably (...)
I've patched my clock source to go directly to RF clock input and that removed all visible spurs and reduced noise levels a bit. So in conclusion there was interference on clock signal due to bad design. But your signal has still very bad spectral purity.Especially PN seems horrible.
Is there any way to extract the average value of a voltage waveform without using a low-pass filter? The signal is of high frequency. I don't want to use a filter, as the the average I am trying to extract will go to an op-amp. So there will be stability issues if there is a large pole in the op-amp path.
If I had to pick one or the other, I'd go with a harsh load step over the AP300 because you get to see both small and large signal response, and I've seen more "WTF?" involving the latter. Nothing against the AP300 or the need to diligently stabilize the design, just that small signal stability is not the end of it and a simple test method (...)
Hello, This concerns the feedback loop stability equation for a Fairchildsemi flyback SMPS. The controller is the FSDM07652R. (datasheet below) App Note AN-4137 (link below) on page 9 (equation 33) gives the small signal transfer function of the Modulator & Power Stage for the CCM flyback. In this equation there is a parameter called ?K?, w
Hi I have made a power oscillator for HF using an RF transistor that is mounted onto a metal enclusure that is used as a heatsink using mica insulator to insulate it from the enclosure (fin connected to collector) The emitter of the transistor is connected to ground and the metal enclosure is not connected to ground. When I touch the metal enclosur
Friends, I am evaluating the stability of my PA. K_factor ( stab_fact(S) ) and B1 (stab_meas(S)) are more than 1 and 0, respectively at all frequencies. So my PA should be stable. I have done another test too. I have applied an step signal at input and seen output voltage. As it is clear in the figure it oscillates and is not stable!!! why?!!!
When measuring if the signals and waveforms are in sync with a Timer, a clock, a oscillator, a crystal, or PLL circuit How does a tech know if the signals/waveforms are sync to a timer, a clock , a oscillator, a crystal or PLL circuit? When looking at a schematic , how does a tech know which signals/waveforms are sync to a timer, a (...)
Hello I have a 17MHz oscillator divided down to 16 times using ttl. Will the stability of the divided output signal be better than the original 17MHz, because of the division? I have found that fine tuning of the divided signal is better. I.e. a greater range 17MHz oscillator is needed to tune to a lower range divided (...)
PID control needs specs to define , system step error response, overshoot under worst case gain and time lag and rate of change of disturbance response Impulse error response ( like opening door on ice cold day) For stability , frequency / phase margin is used to determine correct feedback signal conditioning and gain to optimize speed, (...)
No. As long as you break the loop in a way that doesn't have any other inherent minor loop inside it, the loop analysis will give you proper results. If you are breaking the loop at the opamp output, then you are injecting equal test signal to both the loop, so that should give you proper results.
Because they never operate in linear small signal fashion, linear small signal analysis can't get a grip. Maybe if you created a state-space-average-model abstraction you could get some idea. But I'd settle (heh) for a transient load-step, line-step, inject-perturbation series of analyses and just eyeball it for whether it remains within regul
Any filter (that produce a phase change when the signal pass through) can be used as a resonator in a oscillator. Check the net for "SAW Oscillator" and you get a lot of examples. From my experience, those oscillators do not provide very good frequency stability, stability which is very dependable by the SAW type.
Paralleling a slow ramp and toggling pulse current sources is similar to FvM's suggestion but perhaps a bit easier to create. It will not give you canonical Bode type results but let you eyeball large signal overshoot (which I view as more useful a challenge). However, even here you will find that behavior is going to change depending on how hard y
You can perform a stability test like this, but you have to be careful where you inject the test signal. Basically you want it to be at at a node which sees a very high impedance in one direction. That document shows doing the injection between Vout and the feedback attenuator, which can work if the attenuator impedance is high. Another common plac
Hi I have always worried abut EMI signal and its Effect on my design. what is the best way to examine the behavior of our design? How the major companies check their design in this term? Thanks
stability is primarly discussed in small signal analysis. As you'll know, it uses a simplified linear OP modell and doesn't care for signal magnitude. Thus it can't answer your question. When advancing to large signal analysis, you have to notice the various nonlinear effects of a real system. To consider a simple (...)
You will need to use a synchronizer on your 10MHz clock. Then apply an edge-detect circuit to your synchronized signal.