Questions tagged [oscillator]

A device or circuit that generates an AC signal at a certain frequency.

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27 views

Effect of slight variations of load capacitors on frequency accuracy of a pierce oscillator

I have currently understood how to calculate capacitors C1 and C2 needed to be connected to a crystal to make its frequency stable in pierce oscillators. Regarding the following equation, C1 and C2 ...
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52 views

How the diode in this circuit achieves AM modulation

For the last week, I've been looking for a simple circuit to transmit VHF analogue TV video signals, so that I can transmit my Raspberry Pi output to a TV set. Since I don't have enough experience in ...
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68 views

Relaxation Oscillator circuit analysis

I'm trying to find the output expression of a relaxation oscillator in the Laplace domain, to then convert it to the time domain to be able to trace its output. However, my circuit analysis isn't ...
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35 views

TCXO with tune-able Frequency

Hello I need a TCXO with tunable frequency 10 to 12MHz. I find the part here A18ST but this company is not responding and I don't find their distributors. Please help me if anyone knows a company that ...
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1answer
35 views

Fractional Frequency Divider

let's consider a fractional frequency divider, which is defined (wikipedia) in the following way: A fractional-n frequency synthesizer can be constructed using two integer dividers, a divide-by-n ...
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3answers
1k views

Why do MCU crystal oscillators not fry the crystals?

I am trying to better understand crystal oscillators. I have been reading ST's AN2867, where they explain that, depending on the crystal, a series resistor (R2 in the diagram below) on the output side ...
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1answer
59 views

What is the theory behind LC circuit's damping ratio value with a little positive/nagtive feedback?

I need to measure damping ratio of LC circuit attached to microcontroller. I want to achieve it by measuring voltage of the highest/lowest point of consecutive oscillations by internal ADC. ADC ...
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2answers
39 views

Phase Comparator and VCO in PLL

I have a basic question about the simplest PLL scheme: The purpose of this scheme is that of generating a signal which is a perfect copy of the input signal (which comes for instance from a crystal ...
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1answer
42 views

Doubts about a differential negative resistance oscillator

let's consider this kind of differential negative resistance oscillator: The output of this circuit is VA - VB. My book says the following sentence: From a quick analysis of the circuit it can be ...
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29 views

How can I setting up RF2506?

I'm going to use RF2506 IC in my project. But I want to know How can I calculate the output frequency. I searched the Internet but I find nothing. I want to change only VTUNE voltage to control the ...
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1answer
68 views

Large Signal Transconductor

I have a basic question about the following circuit, which is introduced in the book " and is described as a "large signal transconductor": It says that: the capacitance value is chosen to be a ...
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1answer
138 views

Resonant wireless charging with really low efficiency, even when coils are in touch

I am working on a new project which uses wireless power transfer. I know that wireless charging in general is not so effective but my circuit is extremely not effective. Can I ask you for some advice?...
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2answers
87 views

MOSFET-based ring oscillator not oscillating (but oscillate in simulator)

I created the following ring oscillator: In the LTspice simulator, it is supposed to oscillate at ~3Hz (LTspice source) given the 47nF caps and 680kΩ resistors: I then built this design on a PCB ...
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1answer
46 views

how can i calculate the transfer function of this oscillator?

first of all i don't know what is the name of this oscillator,so please tell me its name. second of all, how to calculate the transfer function for the feedback loop (A B)? simulate this circuit &...
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48 views

RIT design: math isn't adding up!

I am building a 7 MHz morse transceiver. It has a Hartley VFO and uses the capacitance of a reverse-biased diode to shift the frequency when transmitting. However, I'm struggling with this offset. ...
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1answer
42 views

Value of loop gain for steady state oscillations

I was reading on a book (High-Frequency Oscillator Design for Integrated Transceivers, J. van der Tang, Dieter Kasperkovitz, Arthur H.M. van Roermund) this paragraph about the start-up condition for ...
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2answers
60 views

How is the closed loop transfer function defined for an oscillator?

an electronic oscillator is a device which can generate some signals without input signals. It is an unstable system realized with positive feedback, as shown in the following scheme: Now I have two ...
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2answers
140 views

How to generate 100 A at 20 kHz?

I have interesting problem to overcome and seek some advice. I need to test different hall effect sensors and magnetic cores. I am currently stack at issue of bandwidth. I tested sensors at DC using ...
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27 views

Based on \$f(f) = \phi_{\beta} \; \land \; f(t) = |\beta_u| \$ determine type of oscillator

Imagine the below characteristics of feedback circuit in sinewave oscillator are drawn: $$f(f) = \phi_{\beta}$$ $$f(t) = |\beta_u|$$ Based on the characteristics, how can I tell: Which type of an ...
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1answer
56 views

Mosfet LC oscillator

I'm looking at the following circuit: simulate this circuit – Schematic created using CircuitLab It consists of an oscillation whose frequency depends on the tank circuit (C1, L1 and L2). When ...
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3answers
67 views

Phase Detector for PLL: Operation and Realization

I have some doubts about the realization and the operation of a phase detector for a PLL. My reference book is "The Design of CMOS Radio-Frequency Integrated Circuits" (Thomas H. Lee). The basic ...
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3answers
82 views

Can I replace this oscillator circuit with oscillator IC?

Disclaimer: I am programmer and when it comes to analog circuits I have no idea what I am doing. I have a board with STM32F103 that uses external oscillator made by crystal and two capacitors: The ...
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3answers
122 views

Problem understanding when the OPAMP is switching

I have a problem with following oscillator circuit: Assuming an ideal op-amp. I want to draw the output of Uout, Uc, U+. First of all I want: \$Ua=f(U_+)\$ That is a simple voltage divider: \$U_+ =...
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4answers
124 views

Can't get this schmitt oscillator to work…did I goof somewhere?

Below is my attempt at a schmitt oscillator circuit that uses a 74HC14 and lights up three LEDs in sequence. I built it on some breadboard, but nothing lights up. I'm really at my wits end...can ...
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2answers
67 views

Oscillators and changing waveforms

I have a 40 MHz crystal oscillator that generates a sine wave. If I use a schmitt trigger on the output, would the output of the schmitt trigger be a 40 MHz square wave, suitable for digital ...
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149 views

Multimeter Always Reads 60Hz Measuring a CD4060 Pierce Oscillator

Using a CD4060 IC I’ve built a crystal oscillator circuit similar to the one in the image. I’m trying to use my klein mm400 multimeter to measure the oscillation frequency so I can get a rough ...
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57 views

Finding Quartz Crystal Datasheets and Choosing resistors for Pierce Oscillators

I am trying to build a 2Hz oscillator using a CD4060 IC and a 32.768kHz quartz crystal for a digital clock project. The schematic below is from a hackersbench article. I've circled the part i'm ...
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77 views

How Does the Positive Feedback Bring an Oscillator's Poles on the Imaginary Axis?

In an oscillator, there is a positive feedback that injects energy into the system in order to sustain the oscillations. This feedback places the system's poles on the imaginary axis. I'd like to know ...
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32 views

Minimum voltage supply for a MOSFET-based ring oscillator

I am trying to build a ring oscillator based on N-channel MOSFET like below: How to compute the minimum \$V_{DD}\$ required for the circuit to oscillate? Is this the gate threshold voltage (\$V_{GS(...
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3answers
71 views

Water level sensor. How to read it?

I have a water level sensor in which by varying the level of the water, an inductance change his value in a mobile coil. The sensor have the internal simple schematic like this (i don't know the value ...
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2answers
53 views

Definition of quality factor as function of frequency

I have seen that some electrical components (which contain R,L,C elements) datasheets shows the curve of the quality factor Q with respect to frequency, and not simply its value at the resonance ...
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2answers
32 views

Abracon OCXO variable frequency

I have bought "AOCJY2-5-100.000Mhz-E-SW" OCXO which datasheet is available here. I use this circuit to change the output frequency with a 10K variable resistor. However, by changing the value of ...
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1answer
64 views

1 Hz Clock Signal With CD4060 vs CD4521

I am building DIY digital clocks as a school side project. I need to generate a 1 hZ clock signal. I currently have some 32.768kHz crystals but I need to choose an IC. I don’t want to build the ...
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189 views

Thermal Noise in Oscillators

let's consider this circuital model for an LC oscillator in which the parasitic resistance R is affected by thermal noise (represented here with an equivalent noise current source, according to the ...
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1answer
111 views

Why pick 262144 Hz oscillator frequency?

Some Bulova watches (for example the Precisionist collection) use 262144 Hz crystal oscillators instead of the usual 32768 Hz. What are the true advantages of this higher frequency, if they even exist?...
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104 views

Crystal oscillator using 7404 is unstable

I am currently building a small Z80 microprocessor system and require some kind of clock generation. It is not my first design: Earlier I used an Arduino pin that generated a slow clock or a 555 timer....
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23 views

Convert AC to DC using Phase Shift Oscillator

from what I know, we can convert DC to AC by using Phase Shift Oscillators. I'm able to pull off the manual calculations, but as for simulation on Multisim 14.2, I didn't get the desired graph(phase ...
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698 views

Trying to get a 32.768 kHz crystal to oscillate

I've spent quite a bit of time read up on oscillator circuits and trying to get this circuit to oscillate. I'm trying to build this oscillator for a clock but I won't be putting it into a RTC, so I ...
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40 views

Oscillator in Multisim [duplicate]

newbie here. As I read through webpages, i got to know that Oscillators are capable of changing DC to AC. I made a phase shift circuit in Multisim, but I got no idea what should I do next. I was ...
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84 views

How does a microcontroller provide a frequency higher than its crystal frequency? [duplicate]

I have a microcontroller which is connected to an 8MHz crystal. I have a schematic which has a QSPI flash IC connected to it whose clock is provide by the micro and happens to be 48MHz. I want to ...
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49 views

How to calculate total harmonic distortion in PSpice?

How can I calculate the total harmonic distortion of a sinusoidal Oscillator in Pspice? I am using eldo and ezwave for the simulations and waveforms.
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2answers
79 views

hex inverter oscillator

I stumbled across this clock generator, and it is new to me. I'd like to calculate its frequency (actually min and max, since there is a trimmer), but I don't know how to do, since similar oscillator ...
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1answer
52 views

What is the difference between these ring oscillator topologies? How can I simulate one without “noise voltage?”

If I understand correctly, with ring oscillator, it adds the negative feedback back to the loop to make a supposedly infinite gain. With the first topology (NMOS inverter) the negative feedback adds ...
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49 views

CC Colpitts oscillator calculations

I'm trying to make a low inductance measurement using CC Clapp oscillator. I calculate things, I get strange results. Would someone please write me the formula solving for Lx? And how do I ...
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1answer
248 views

Voltage levels of Microcontroller Oscillator Pins

I am using MPC5606S Microcontroller. I want to clear one concept and have a doubt. The Microcontroller using 8MHz crystal on the pins 27 (XTAL) and 29 (EXTAL) And a 32.768kHz RTC crystal between ...
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83 views

“Interpolation” oscillator working principle

I was reading Soviet amateur electronics magazines and stumbled upon an interesting oscillator. It uses two high-frequency crystals (27.14 and 26.67 MHz) to to get a low-frequency output (465 kHz). ...
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1answer
64 views

Driving high impedance load with Crystek Sine Wave Oscillator- CCSS-945X-25-100.000

I am planning to use Crystek CCSS-945X-25-100.000 sine wave oscillator to drive the reference CLKin pins of TI PLL IC LMK04832 . Now in datasheet of oscillator, output power mentioned is 5dBm into 50 ...
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38 views

How to change/calculate frequency of this oscillator circuit?

I stumbled on this circuit (PDF, redrawn below), built it on a breadboard and bingo - works like a charm with a nice 1.0053kHz sine wave on the output. A little noisy given the breadboard, but ...
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Powering crystal oscillator (not the uc's one) using one of microcontroller pins for power saving

I want to design a low power RF link using SI4463 and I just need to send data but when I was searching for a crystal oscillator found out that most of them consume about 2-5 mA current. Is it ...
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27 views

Need help to understand the schematic of RC circuit connected to CD4541

I'm trying to understand a schematic of a board that controls the relays of an Electrical panel. In a Part of the schematic, there is a CD4541 (Programmable Timer IC) which its connections are as the ...

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