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Statistically, most parts have short life time, or very long life time. If the parts passed the burn-in test, they will have long life time. Burn-in test is used to selected the qualified parts
what is a pmos used for
First, the gain should be small signal analysis.
AC impedance refer to the small signal impedance, it range from 0 to infinite Hz. We should use this impedance in the gain analysis.
The DC gain should be the small signal gain at 0 Hz.
Current source has the same...
pass device ldo pmos or nmos
The 20ohm resistance is the DC impedence. In this calculation, AC impedence should be used.
e.g. a 200mA current source is connected to the output of LDO, It s AC impedence is infinite.
My concern is: if using so small AC resistence at the output of LDO, it will...
Hi All,
In p202 of "Delta-Sigma Data converter: Theory, Design and simulation" by Norsworthy, Figure 6.6 show a cascaded(1-1-1) modulator. It seems that this cascaded modulator can not cancel the quatization error of the first and second stage. If removing the delay unit between stages, it...
1) The wideband is due to the resistor load, since it have lower parasitic cap. M5 M7 provide DC bias. Also, source follow may have inductive output impedence, maybe it will improve the freqency response.
2)M12 M13 M14 provid bias to the gate of M5 M7 with 3Vgs
3) gm10 gm11 is AC impedence not...
For the 1st question, Yes it should come from simulation. High speed diveder is sensitive to the input amplitude.
You can run simulations on some interesting frequency points. For each freq point, try to find the minimus input amplitude at which the frequency divider can still work. Then you...
Re: Power on Reset
For the power-ok signal. it neet to be hysteresis, otherwise the power-ok signal may switch when the supply is equal to the threshold.
the bandgap must work before the supply reach to the threshold.
Added after 2 minutes:
For the power-ok signal. it neet to be...
you can find the information/formula in Razavi and R.G. Meyer's analog book.
Matching can be improved in circuit design and layout.
In circuit design,
For current mirror, increasing overdrive voltage will improve matching
For diff AMP, Reduce override voltage will improve matching
In layout...
The system must oscillate, even though you do not input any signal, just like oscillator. The noise of device and nonlinearity of the circuit will launch the oscillation.
The location of pole is the basic criteria of oscillation. The Nyquist critreria is derived from it.
Tianlei
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