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

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41 views

Why Inverter with feedback oscillates ? [duplicate]

Phase difference between input and output for this circuit is 180 degree. That means Barkhausen criteria is not satisfied,still circuit generates a oscillating signal. Why ?
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2answers
50 views

Question about CMOS Inverter Oscillator

Using CMOS inverter with crystal and cpacitors, we can make a oscillator. And i find many docs mention the method 'negative resistance'. But, they are not all the same. The method from TI's doc: Use ...
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0answers
30 views

How can I use the OSC2 pin as normal IO on a pic32mx150f128b?

Everything else works well, the CPU runs at 40 MHz, UART works, GPIO works; the OSC1 pin works as GPIO as well. But I cannot use OSC2 as GPIO. I am using the Fast RC oscillator with divide-by-N and ...
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0answers
27 views

Fixed Frequency Synthesis with PLL

I'd like to design a downconverter with a fixed local oscillator frequency ~2GHz with fairly good stability. I understand that the best way to do this is a PLL with a fixed crystal oscillator and a ...
0
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0answers
27 views

Feed Raspberry Pi camera module with external clock signal

I want to frame synchronize multiple Raspberry Pi camera modules - I guess I can do this by feeding all the modules with a single external clock signal. The thing is being discussed in this post. The ...
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3answers
38 views

Working of RC Phase shift Oscillator?

Figure show a RC phase shift oscillator using Op-Amp with gain 5(Vo/Vi). My assumption : Circuit is generating a sine wave with a peak to peak voltage of 10v. Consider positive maximum point (+5V) ...
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2answers
103 views

Problem in wien bridge oscillator

I have put up a circuit for Wien bridge oscillator using 741 op amp, with R= 390 ohm and C = 2.2nF, for operation around 200 khz ( gain is 4). However, it did not work so I switched the resistor in ...
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1answer
48 views

Why Wein bridge can be used with both positive and negative feedback, while RC phase shift type can be used with positive feedback only? [closed]

Wein bridge should use positive feedback because we want zero phase shift in the feedback path?
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1answer
40 views

LC comparator based oscillator

I am trying to build a LC oscillator based on LM393 open-collector comparator, but am having some difficulties. This is the current circuit: I was expecting to get a nice square wave with one ...
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65 views

Would my project be affected by lack of a filter?

I have chosen to do a final project, I will be transmitting bits using a wien bridge oscilator, I want a 160 MHZ sine wave and I have chosen values for it. I have chosen the AD8041 op amp because it ...
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1answer
69 views

How can i send bits using a wien bridge oscilator?

so i have a string of bits that my shift register will be outputting one after another, i wanna use a wien bridge to send them into air. if a bit is a "1", i want the wien bridge to send a wave, and ...
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1answer
67 views

Understanding the Pierce Oscillator Pi Network

I've been looking at the Pierce oscillator and I think I understand how it operates, but I'm a little unsure of the role played by the series caps to ground (the so-called pi network). I've put ...
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1answer
32 views

How to connect muRata XRCGB_F_M Series (XRCGB27M120F3M00R0) to microprocessor oscillator

This device as described in the data sheet (Crystal Unit (Crystal Resonator)) shows four pad pins (labeled 1-4) in an arrangement similar to ceramic resonator units. However, as shown in the diagram ...
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1answer
130 views

I want to make an oscillator with 160 MHz

I want this for my project. So I have decided to make a basic Wien bridge oscillator. $$f = \frac{1}{2\pi R C}$$ So if I choose a capacitor of 0.1 nano farads and a resistor of 10 ohms, I should ...
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1answer
95 views

Help with a RF reciever circuit

Recently I have been working on a basic RF receiver, but my efforts so far have proved fruitless. I designed the following circuit based of of previous research into the topic. According to what I ...
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1answer
52 views

Problem in Clapp oscillator

I've set up this circuit on breadboard ( C1 being electrolytic and others disk) with Q1 as 2n3904. The simulation is perfectly fine and the oscillator works in the simulator as expected. However, ...
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2answers
81 views

What are quartz crystal oscillators?

I'm a beginner in electronics and I found two quartz crystal oscillators, each one has two pins. Their numbers are: sjc4.000a ee4.000 Is it possible to know the ...
2
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1answer
63 views

How to configure PIC24F oscillator?

I'm coding on PIC24F and I'm still fighting with oscillator configuration. Between configuration bits and SFRs such as CLKDIV and OSCCON I am a 'bit' lost... I've been making things work by trial and ...
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2answers
106 views

How to make an easy oscillator?

I want to make a very simple oscillator that produces the sound of telephone ringing (I want to make a ringer). I will not connect it to a telephone so the quality of the sound is not important. I ...
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3answers
71 views

Crystal or Crystal Oscillator for time sensitive device

A device that I'm working on is controlled by ATmega328P microcontroller. This will be some sort of a watch, therefore I want it to be as precise as possible. For instance if left to run for a whole ...
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1answer
22 views

Input / output voltage standards for modular analogue synthesizer

I'm investigating building a modular analogue synthesizer, and learning electronics along the way. I want to get a firm understanding of the supply voltage, inputs and outputs specification that is ...
1
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1answer
85 views

Crystal clock oscillator giving out sine wave, help?

I am building a 50MHz clock by using ABRACON ACOL-50-EK crystal clock oscillator. I have connected 3.3V supply (with a 0.1uF capacitor to ground) to Vdd (pin 14). GND (pin 7) is grounded and output is ...
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3answers
111 views

External oscillator problem

I have this sample program to blink LED with PIC18F4550 using external oscillator. I'm using a 20.000 MHz crystal oscillator with 30pF capacitors. The problem is when I wire the capacitors the the ...
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38 views

Crystal Oscillator output voltages and power

I have built the crystal oscillator stage to the Pixie 2, a Hartley oscillator, with a 9 volt voltage source. I measured the output with my VOM set to AC 30 volts. It read almost 30 volts. That is ...
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2answers
261 views

Common Emitter not amplifying

I am trying to make a 27 MHz carrier wave transmitter from a crystal oscillator and a secondary amplifier. Thi is the complete circuit: simulate this circuit – Schematic created using ...
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2answers
85 views

Simplest possible oscillator (with some constraints) [closed]

I'm interested in finding an oscillator circuit that meets the following constraints: Runs on 9 volts or less Periodicity 100-1000 Hz or so Non-sinusoidal oscillation No inductors 1 transistor or ...
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1answer
35 views

Analyzing/designing positive feedback amplifier

I've been searching all around to find a tutorial on analyzing/designing a positive feedback amplifier, especially a single transistor in common collector mode, but with no luck... So, lets say I ...
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1answer
41 views

Colpitts VCO by varying base voltage

I've noticed that if I build a Colpitts oscillator (audio range) using a transistor in the common base configuration (similar to the circuit here) I can vary the voltage on the base and get a wide ...
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2answers
211 views

What type of oscillator is this? (Theremin Project. Variable Pitch / LC Oscillator)

I found this oscillator at a Theremin project pdf. I simulated the circuit, and found that the output (left wire) oscillates at 236.5 kHz. This circuit is referred to as "Variable Pitch ...
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1answer
44 views

Wien Bridge Frequency Selective Network Frequency Response Proof Exam Question

So this is part of the solution to the proof of what the frequency response on the frequency select section of the Wien Bridge oscillator. What I don't understand is how the answer are equal to ...
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4answers
415 views

Why don't infinitely many sinusoidals exist in an oscillator circuit?

A sinusoidal oscillator, takes the ambient thermal noise or any imbalance in the circuit as input and gives out an oscillation. This kind of oscillators are called to be linear. By the nature of a ...
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2answers
66 views

Keeping output of a phase shift oscillator in-phase with another sinusoidal signal

I have a sine wave source and a phase shift oscillator which gives out sine wave. The sine wave source is not always enabled. It may be turned of in arbitrarily time periods. I want the phase shift ...
8
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1answer
411 views

Why doesn't my opamp relaxation oscillator oscillate?

I have designed a relaxation oscillator with an opamp. It is supposed to oscillated at 50Hz, but it doesn't. I haven't built a physical circuit, I'm trying to simulate it in CircuitLab. I calculated ...
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1answer
81 views

How to tune a radio receiver using a crystal oscillator?

I'm building my first radio receiver (a simple Ramsey HR-40 kit). The "Alignment" section of the instructions requires that I have some other device which I tune my receiver to. Since I have no such ...
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3answers
150 views

Getting the right frequency from an oscillator circuit

I have constructed an oscillator circuit using the resistor and capacitor values shown in the diagram above (from the Proteus ISIS simulator). I run the circuit and use a switch to trigger the ...
3
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3answers
148 views

how does current go to infinity in an ideal LC circuit at resonance?

Consider an ideal LC series circuit, excited by a sinusoidal source at resonant frequency. Assume zero initial conditions, for capacitor voltage and inductor current. simulate this circuit ...
3
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1answer
69 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
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1answer
105 views

Oscillator problem

I was designing an oscillator for HF range. Although both the circuits are same, the first circuit doesnt work while the second one does, despite the fact that the varicap used has 17 pF at 20 V. ( ...
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1answer
90 views

pic16f628a internal oscillator setup error undefined symbol “INTOSC”

I want to set internal oscillator for pic16f628a, according to datasheet page 96, I have to set FOSC_INTOSC, but I get this error ...
2
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1answer
68 views

What is the conductance of this LC tank?

So, I start with total conductance: $$ G_{TK} = \frac{1}{\frac{1}{j\omega C}+ 2R_C} + \frac{1}{j\omega L + R_L} $$ Then, when I take only the real part of this expression in order to know the ...
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2answers
82 views

Why Inductor reactance 180 ohms?

Why is the inductor reactance 180 ohms for designing Voltage controlled Oscillators ( or oscillators maybe ?) I came across a few resources for designing oscillators, colpitts and hartley ...
2
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1answer
238 views

Why does this regenerative receiver not just turn into an oscillator?

I'm trying my hand at making a radio transmitter and receiver and I'm not sure exactly how this receiver works. I understand its a continuous wave receiver which is good for on/off transmission. I'm ...
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0answers
55 views

Crystal Oscillator Output Amplification

I have a HCMOS Crystal Oscillator at 50 Mhz (DataSheet). With an ac coupling and pi network I generate a sine wave with 50 ohm output impedance. In standart bjt oscillator circuits, one need to make ...
15
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3answers
2k views

How does a Crystal work?

Specifically, a 2pin and 4pin quartz crystal oscillator. What I know: current is applied and the crystal oscillates in order to provide an oscillating signal. What I want to know: How does the ...
2
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2answers
78 views

Can oscillators be made from a single supply?

Oscillators such as a Wein-bridge sinusoid or a square wave Schmitt trigger oscillator. Is it possible to bias these so they oscillate above 0V?
2
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0answers
32 views

Microwave Oscillator: Both Ports Unstable?

I'm just wondering, for microwave oscillators, I think both ports need to be in the transistor's unstable region. What would happen if just one port were in the unstable region and the other in the ...
1
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1answer
84 views

Proper oscillator for CPLD

I plan to use KC5032A40 as a clock source for CoolRunnerXPLA3 256. I power it with 3.3V and interface it as suggested: I perform the measurement at the Test Point and do not add any CL capacitance, ...
4
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2answers
99 views

Why use asymmetrical capacitor values for crystal?

Are there any circumstances where you would want asymetrical load capacitors on a crystal? I came across this schematic in the documentation for an NXP UART. It looks just wrong to me. Can anyone tell ...
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2answers
90 views

Ring oscillator frequency

According to Barkhausen's criteria, for oscillation the feedback should be made after phase difference of 2pi and gain has to be >=1. Now when I consider a ring oscillator if 2 inverters are ...
3
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1answer
242 views

Crystal oscillator wave shape?

I hooked up a crystal oscillator (4 pins) to Vcc + Gnd and observed the generated waveform using my scope. I think everyone will agree the waveform shown is very distorted and I am not sure why. Any ...