Questions tagged [crystal]
Piezo-electric device cut at a specific resonance frequency, mostly used in oscillators.
786 questions
-2 votes
2 answers
98 views
6 votes
4 answers
739 views
Quartz crystal resonator aging
Quartz crystals have frequency drift with time. Such drift is usually stated over small time frames like one month. Does the drift settle down? How would things be when restoring comms gear from the ...
- 16.3k
2 votes
2 answers
233 views
Crystal quartz oscillator is it good for amplitude modulation?
I am in need of a sine wave generator for a AM modulator I am building.The carrier signal of my AM modulator will be at 10MHz.I searched through the internet and found a circuit on https://www....
- 498
2 votes
1 answer
218 views
How is load capacitance calculated given only a Crystal Oscillators frequency?
I would like to start out by saying I know the load Capacitance is 18pF for my 16MHz crystal oscillator and that would make my C_L1 and C_L2 both equal to 26pF given a Stray Capacitance of 5pF for my ...
- 21
1 vote
0 answers
71 views
Link drops during vibration/shock tests (crystal losing stability?)
I designed a custom board with an Intel I226 Ethernet controller. At 2.5 Gbps the link works perfectly under normal conditions. However, when we take the board to vibration and shock tests, the ...
- 553
1 vote
2 answers
108 views
How to decide Rext size on STM32 crystal design?
I am designing a HSE circuit for a STM32F1 series and am using an 8 MHz crystal. I have been using the STM32 application note AN2867. The crystal selected is ECS-080-18-5PX-JES-TR. I have calculated ...
1 vote
3 answers
1k views
Why crystal called XTAL in electronics
Do you know where the name "xtal" comes from? I read on the internet the below answer but I am not sure if it is correct and I can't find any book source to validate. X is the Greek Chi, ...
- 853
1 vote
1 answer
137 views
Crystal oscillator ground plane isolation
Since (as I suppose, and correct me if I'm wrong) ground plane considerations when it comes to PCB layout for quartz crystals is to limit/avoid capacitive coupling from/to the crystal traces, Would ...
- 313
2 votes
1 answer
124 views
SMD Crystal mounted on resonator footprint
Would this arrangement of caps and crystal be fine on Y2's spot for a quick test on the crystal's accuracy ? What went wrong: a resonator footprint got used instead of a crystal footprint. All the ...
- 1,158
-1 votes
1 answer
65 views
Crystal Xtal Phase Shift
I read on the internet that crystals with high Q have small phase shift. What is phase shift of a crystal and why phase shift is nessesary in order the crystal to oscillate like on the circuit below? ...
- 853
2 votes
2 answers
170 views
Crystal schematic design (choosing R and C)
I want to design a schematic for this crystal (ABLS2-8.000MHZ-D4Y-T) and I assume I need to add two caps and a resistor as follows: So I want to choose R23 and C23, C22 based the datasheet, as far as ...
- 1,438
4 votes
1 answer
195 views
Crystal oscillator, load capacitance and damping resistor requirement and reasoning
I am working on a STM32L4 schematic. I am using 2 quartz crystal oscillator, one of 8 MHz (primary clock reference for high speed inyerfaces such as I2C, UART) as the HSE and one 32.768 KHz(time ...
- 557
0 votes
0 answers
172 views
Why my crystal radio is not producing sound
I tried making a crystal radio, but it doesn't work, it doesn't produce a sound or anything. Here is the pic I used a piezo buzzer with its internal circuit removed and a wire connecting to a flower ...
- 23
2 votes
3 answers
163 views
How much would the crystal drive level be in my circuit?
I sadly don't have an oscilloscope to check. I would like to ask someone here who knows better what the drive level of the crystal would be in my circuit. I am powering it with 6 volts right now but ...
- 51
0 votes
1 answer
84 views
Do I need an external crystal for USB on STM32F042F4Px, or can I use the internal RC oscillator?
I’m working with an STM32F042F4Px microcontroller and want to implement a USB full-speed (12 Mbps) device. According to the datasheet, the chip offers: HSI48: internal 48 MHz RC oscillator with USB ...
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