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The issue with most relaxation oscillator designs is that they have fast sensor amplifiers and slow slews. Wide bandwidth together with hysteresis translates to the generation of unnecessarily high noise voltages. You could in principle slow the detector amplifier to match the slew, but this...
There are various forms.
One of these uses transmission-line ring resonators that include biased ferrite so that the resonances for opposing directions of propagation are at different frequency. You can consider it as a resonant equivalent of a circulator-based isolator. This is rather...
There are many devices that are called a ring resonator, with different applications. Many of these have appeared at CST meetings, so you would need to be more specific, because, for example:
Sapphire/Rutile dielectric ring resonators at microwave frequencies are used to control oscillators in...
Presumably we are looking at gate-referenced Voltage noise here? If so, this could apply to some processes and bias conditions; however, there are too many variables.
For example, the PMOS devices in some 0.35-um processes had N-doped gates, and consequently a buried channel that has much...
In general the circuit design (including choice of device types) determines nearly everything.
For MOS devices this can include shaping the gate so that the parts of the device that contribute most to the flicker take larger proportions of the area; this can be achieved either by using...
The generation of flicker noise depends in CMOS depends both on material quality and on the fields in the conducting region.
Historically, thinner oxide meant better quality material, and flicker noise (for equal area devices) tended to reduce as the geometry got smaller.
However, field...
If you want a crystal ex-stock (or near) and you have a specific frequency in mind, it's worth talking a few reputable SC cut suppliers to see who might have something ex stock
Western sources for SC crystals that I have reason to believe produce good product include (country given is location...
As it is generally straightforward to achieve a noise figure below 5-dB, I have my doubts that your modification will effect more than about 6-dB improvement under the conditions of use envisaged by the chip designers - indeed, it is more than likely that the performance under those specific...
Yes, this is a good starting point. For "standard" crystals where you simply want reasonable performance the only additional data needed is that the crystal conforms to a recognised international standard (as these already include related limits on second level drive). But there is nothing in...
I agree with Dr. Drew - Croven is another reputable supplier. As indeed are most of the companies who manufacture SC crystals.
But I would add:
a) Typically, if you are ordering a small quantity of high-performance crystals you will do best to speak to the prospective supplier and follow...
Quote: "Every diffused resistor is a MOSFET in disguise"
"Diffused" in this case includes polysilicon resistors.
In real life, metal above a resistor has two effects:
first, it acts as a local gate so the surface field on the resistor is well characterised.
second, metal is ductile, and...
Many people (myself included) use a Colpitts-type resonant circuit with a series LC (resonant slightly below the desired oscillation) in series with the emitter of the oscillator transistor to suppress the B-mode oscillation. The advantage of this and related methods is that it doesn't need to...
I can't answer for Kevin, but (in case you wish to start searches before he replies) I have heard good reports about Krystaly
They are in Hradec Králové
+420 495 406 687 Sales
krystaly@krystaly.cz
Krystaly, Hradec Králové, a.s.
I think we are in agreement about internal dissipation in modest-Q DROs at usual drive levels. However, the phase gain of the maintaining amplifier can be affected by flicker noise in three ways - change in (base-emitter) diffusion capacitance, change in base-emitter conductance, and change in...
I should clarify - I'm referring here to ALC that is driven from the collector current. ALC based on crystal (or "circulating") current gives advantage for variations both of crystal R1 (ESR) and of base input conductance.
An alternative if using controlled collector current plus current...
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