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15 Threads found on Stability Oscillating
I am following RF design book and tutorials on negative resistance oscillator, but encounter some problems. My design is 5GHz oscillator. I want to use single device, so i decided to use NE3210S01, it has very high gain, there are many papers with push-push, etc. oscillators, where NE3210S01 fundamental oscillation is at 3...9 GHz. My idea is th
It may be a transient stability issue with your design. I see a few RC time constants, which may be responsible for this behavior.
Problem you have is when resistors are changed Ic current must not be changed. Resistor 1k can have so high resistance that 270ohm resistor is not needed. In this case temperature stability is lowest possible. Changing resistors you also change the gain and phase of amplifier which may stop oscillating. 10mA current of a divider is a bit high for Q
Hello all I'm designing a Class E PA at 13.56MHz. I find that Freescale MRFE6VS25N, which can work from 1.8MHz to 2GHz, is very suitable for my design. However, the wide working bandwidth makes a new issue: Will the amplifier be oscillating due to the harmonics which are s
stability is not considered in the band which is interested only, instead stability should be checked until fmax.Therefore, your LNA may work in the band but it may also oscillate somewhere at out of band. What type of pHEMT do you use ?? D-Type or E-Type ?? You LNA is probably oscillating somewhere but your don't know.I understand this from (...)
Your simple buck regulators may be oscillating with insufficient load capacitance and low ESR for ripple or simply insufficient pre-load of 10% before the switch. Please advise if adding preload helps on stability and larger low ESR Cout Caps. - - - Updated - - - Your simple buck regulators may be oscilla
It also needs stability analysis. Pls derive behavior model and have simulation to check phase margin.
Hello all, I have a question concerning the stability criteria of system/circuit that always bothered me. Q: A bode plot where the phase response toggles from 180 to -90 (or anything negative for that matter) while the gain response remains above 0dB is representative of an unstable/oscillating system. Does the same hold true if the phase res
You have to use techniques to improve stability of your LNA. To get k>1 at 2 GHz and out of that. It's alway good to improve k outside the working frequency because you get a minor chance to have your LNA oscillating in other frequencies. You can use some techniques to do that: 1)Series feedback: inductor at source (source leads) improve stabil
If it is unstable, it means that it will be unstable from the smallest change (noise) in the circuit. As well from the input side or the load side. Only in theory, a ball can stay on the top of a mountain. The smallest breath of wind will cause tha ball to roll down. The only solution is to design the system with enough stability margin.
this means that the LNA is oscillating , negative S11 means that the LNA is not stable , u need to check the stability factor of the LNA , and check source and load stability circils khouly
mmm , u need to download the S paramters , of this amp and check the stability of the amp , also u need to check the TIA output impedance , and how it will drive the UPC2776 khouly
Ceramic resonators are made of high-stability piezoelectric ceramics, generally lead zirconium titanate (PZT) which functions as a mechanical resonator. When voltage is applied, its piezoelectric "vibration behavior" causes an oscillating signal. The thickness of the ceramic substrate determines the resonance frequency of the device. A ceramic r
I have a doubt that whether we need stability analysis for supply independent bias circuit.
I want to make RF power amplifier ,but I dont know how to check stability of this amplifier .