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Results tagged with oscillator
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user 40274
A device or circuit that generates an AC signal at a certain frequency.
0
votes
Why will an ideal double integrator oscillator only oscillate at one frequency?
Quote: „Curiously, this is an exceptional oscillator which does not appear to fail to start in spite of this apparent difficulty“ (R. … This is because this oscillator topology works only because of the non-idealities of the opamps used. …
- 28k
0
votes
What requirements of a feedback network are needed to produce oscillation?
Another well-known solution for the feedback path is based on two integrator stages in series (Double-Integrator-oscillator). …
- 28k
1
vote
Why do the diodes make a huge difference in an RC sinewave generator circuit?
The problem with your circuit is that the dimensioning is wrong.
The oscillation condition requires that the closed-loop gain at the desired oscillation frequency is "3". Hence, the feedback resistor …
- 28k
4
votes
Ring oscillator frequency
The most important condition for such a ring oscillator is an uneven number of inverter stages. Only in this case you have negative feedback for DC. …
- 28k
2
votes
Why is the inverting gain of this phase shift oscillator 8?
The damping factor of the shown CR-network (node "V3") at the frequency with a phase shift of 180deg (fo=916 Hz) is k=0.10725.
Therefore, you need a gain of at least G=-9.32 in order to allow oscill …
- 28k
1
vote
How does this oscillator circuit work? Inductor phase
Here is my short explanation:
The transistor has a finite (dynamic) output resistance r_out which - together with L2, L1 and C4 - forms a third-order highpass in ladder topology: r_out-L2-C4-L1 (termi …
- 28k
2
votes
Understanding Crystal Oscillator with 3 BJTs
I know many different oscillator circuits - however, I must confess that the shown version is new for me. …
- 28k
0
votes
RC oscillator loop stability with AGC
Hyp - I have the following question:
You have selected a relatively complex oscillator circuit (with three opamps).
For which reason - dictated by which requirement? … Did you review some other (simpler) oscillator topologies which also could meet your requirements? For example, a THD of max. 1% (as mentioned by you) is really not a severe problem. …
- 28k
1
vote
Why is the gain of a phase shift oscillator 1/29?
Short answer:
Because Barkhausens oscillation condition requires unity loop gain.
That means: The attenuation of the passive network can be conputed to be 1/29 for the frequency where the the phase sh …
- 28k
4
votes
Accepted
Why does the tank circuit of a Colpitts oscillator produce 180° phase shift?
You must discriminate between Colpitts oscillators in common base or common emitter configuration, respectively. And - most important - you must realize that the LC tank contains a capacitive divider …
- 9,310
1
vote
Self-designed sine wave oscillator problem (frequency and waveform)
I think, the design of the negative feedback path is not good. At the series resonance of the LC-bandpass the positive feedback is app. 50%. At the desired oscillation frequency, the negative feedback …
- 28k
1
vote
Trying to understand a phase shift oscillator diagram
Do you know the general oscillation condition (Barkhausen)?
It requires a loopgain - that is the gain around a closed loop - of unity (in practice somewhat larger) at one single frequency only.
As far …
- 28k
2
votes
Oscillator Barkhausen condition
Each working oscillator needs
(a) negative feeedback for DC (stable DC operating point), and
(b) positive feedback for a single frequency, in particular: Loop gain with zero deg. phase shift and a gain …
- 28k
7
votes
Why doesn't the bypass capacitor cause phase shift in this oscillator circuit?
As far as the oscillation condition is concerned, it is the phase shift within the feedback loop that only matters! Therefore, the coupling capacitor at the collector node has practically no influence …
- 28k
0
votes
Voltage amplitude of Hartley oscillator
An oscillator provided an output without any input signal. … Regarding the output amplitude: Because the oscillator must start at zero amplitude the gain must be large enough to cause a continuous increase of the amplitude. …
- 28k