SPICE simulation -- how to bias a crystal oscillatoir

Started by Anonymous in sci.electronics.design7 years ago 26 replies

Could some electronics/SPICE guru please help ? I have a simple model of a quartz crystal, as used in an oscillator. With my SPICE simulation, I...

Could some electronics/SPICE guru please help ? I have a simple model of a quartz crystal, as used in an oscillator. With my SPICE simulation, I can measure both the parallel and series resonant frequencies of the "pure" crystal. However, when I attach the same crystal to a biasing circuit, and run the simulation, the output is a flat DC offset. The biasing circuit involves two CMOS(1.0u m...


one-IC digital PLL?

Started by frank in sci.electronics.design6 years ago 15 replies

Hi all, I'm looking for a small-real-estate solution to generate a clock (ttl/cmos 5V) from a given quartz oscillator. The output clock I need...

Hi all, I'm looking for a small-real-estate solution to generate a clock (ttl/cmos 5V) from a given quartz oscillator. The output clock I need is 4/9 or 4/7 ratio of the original input clock. I know I can easily make a VCO/PLL solution, but the real problem is a very small space on the PCB, so I might be able to use a couple of small ICs, but probably not too much else. Input clock is < 2


Peter Baxandall's 1959 Class-D oscillator paper.

Started by Bill Sloman in sci.electronics.design9 years ago 3 replies

This has been available on my web-site for a couple of years. The web-site has moved to Australia and the URL has changed in the...

This has been available on my web-site for a couple of years. The web-site has moved to Australia and the URL has changed in the process. The new URL for the scanned image of the paper is http://sophia-elektronica.com/0344_001_Baxandal.pdf It has been posted with permission from the UK IEE who own the copyright, as noted here http://sophia-elektronica.com/Baxandall_parallel-resonant...


some gear

Started by John Larkin in sci.electronics.design6 years ago 20 replies

Just found this online. https://www.flickr.com/photos/llnl/3501671601 It's the Master Oscillator Room for the NIF laser fusion facility....

Just found this online. https://www.flickr.com/photos/llnl/3501671601 It's the Master Oscillator Room for the NIF laser fusion facility. It ggenerates the 192 shaped fiberoptic pulses that get amplified to free-space megajoule level to whack the hydrogen pellet in the target chamber. https://www.flickr.com/photos/llnl/3421902499/in/photostream/ The black rackmount boxes with the cir...


A current mirror variation on the Baxandall Class-D oscillator for producing a reasonable clean sine wave.

Started by Bill Sloman in sci.electronics.design2 years ago 8 replies

I've up-dated my website to add a circuit diagram, some comment on it, and the text from the corresponding LTSpice .asc...

I've up-dated my website to add a circuit diagram, some comment on it, and the text from the corresponding LTSpice .asc file. http://sophia-electronica.com/BillsBaxandall.html The circuit produces a balanced pair of 1V rms 17kHz sine waves. The LTSpice simulation suggests the third harmonic content is about 60db below the fundamental, and the fifth harmonic is even smaller. It's not a par...


coaxial ceramic resonator oscillator

Started by John Larkin in sci.electronics.design6 years ago 8 replies

These are great. 1 or 2% frequency accuracy, enormous Qs, very...

These are great. 1 or 2% frequency accuracy, enormous Qs, very low tempcos. https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/CCR_600/CCR_600.JPG https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/CCR_600/CCR_600.zip -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com...


Software Controlled Crystal Oscillator

Started by rickman in sci.electronics.design7 years ago 40 replies

An interesting chip design using async processors controls a single I/O pin with the conventional high/low and drive/hi-z bits. A crystal is...

An interesting chip design using async processors controls a single I/O pin with the conventional high/low and drive/hi-z bits. A crystal is connected to this pin and the goal is to make it oscillate. To start the crystal is driven with a square wave of approximately the right frequency as controlled by a timing loop of the async processor. This drive loop runs for a given number of cy...


GPS frequency counter + PLL PIC based

Started by Jan Panteltje in sci.electronics.design10 years ago 1 reply

To 'stabilize' the frequency from the 'twisted' wire oscillator as described in previous posts, and to be able to set it via RS232 and read it, I...

To 'stabilize' the frequency from the 'twisted' wire oscillator as described in previous posts, and to be able to set it via RS232 and read it, I wrote some PIC 18F14K22 asm and added a simple 2 line LCD. The first line shows the requested frequency ,as typed in via RS232. The bottom line shows the measured frequency (against a 10 MHz xtal). http://panteltje.com/pub/GPG_freq_counter_PLL_IMG_...


dumb triangle oscillator

Started by John Larkin in sci.electronics.design6 years ago 28 replies

I'm designing a test set for an energy digitizer/integrator box. It has a 12-bit, 250 MHz ADC and an FPGA and stuff. We want to make sure...

I'm designing a test set for an energy digitizer/integrator box. It has a 12-bit, 250 MHz ADC and an FPGA and stuff. We want to make sure that every ADC bit works, and no data bits are shorted to other bits on the PC board. So we'll apply a triangle wave that's a bit bigger than the 0..+3 volt ADC range, randomly read values, and run some sort of code to make sure every bit goes up and d...


Trying to identify SMD with label scrubbed off - PWM, inverter, 100W 12VDC to 120VAC modified sine wave

Started by John Robertson in sci.electronics.design11 months ago 35 replies

I have a trick on-topic question, looking for possibilities for candidates for a 16-pin SMD device that has these pin outs identified so...

I have a trick on-topic question, looking for possibilities for candidates for a 16-pin SMD device that has these pin outs identified so far: 1 & 16 - RC oscillator 4 - ground 7 & 8 - drivers for a "H" style MOSFet set of four transistors that between them generate a modified sine wave running at 60Hz and 120V. So it is NOT a TI SG3524/3525 chip. The MOSFets generate the pow...


Voltage controlled duty cycle with a CMOS inverter

Started by Anonymous in sci.electronics.design6 years ago 34 replies

Hi I need a dirt cheap voltage controlled duty cycle I have a couple of inverters on the board that are free to use. Anyone done a...

Hi I need a dirt cheap voltage controlled duty cycle I have a couple of inverters on the board that are free to use. Anyone done a voltage controlled duty cycle with a 5V logic inverters? I can't use a 4046, too expensive I was thinking a free running RC oscillator with a FET to offset the operating point It does not need to be linear, I have a error amplifier wrapped around t...


A simple tunable crystal oscillator

Started by Jan Panteltje in sci.electronics.design10 years ago 37 replies

I am going to use the 10MHz output of the Rubbitin frequency reference to make 50.000000000 MHz for my FPGA board. The plot is a bit...

I am going to use the 10MHz output of the Rubbitin frequency reference to make 50.000000000 MHz for my FPGA board. The plot is a bit complicated, and is planned like this: 25 MHz crystal > - FPGA board Spartan2 -> x2 DLL (delay locked loop that is a build in thing in the Spartan2 FPGA) -> 50 MHz -> divide by 5 in FPGA -> 10 MHz -> xor with 10MHz from Rubbitinn unit -> low pass -> 25MHz xta


GPS module with clock output?

Started by Davej in sci.electronics.design9 years ago 28 replies

I'm wanting to accurately time-stamp some outdoor events. This is a stationary outdoor situation so I thought a GPS module might be a...

I'm wanting to accurately time-stamp some outdoor events. This is a stationary outdoor situation so I thought a GPS module might be a good approach for accurate time. If I could find a GPS module with a clock output rather than a 1PPS output maybe I wouldn't need to consider an additional disciplined oscillator module -- since I don't expect to lose the GPS signal lock. Any low-cost suggestio...


Velocity of light. by Mathew Orman - Public release record on November 23 2011.

Started by admformeto in sci.electronics.design11 years ago 73 replies

Read and learn: Velocity of light relative to the source is constant because of constant mass of electrons which are part of the source...

Read and learn: Velocity of light relative to the source is constant because of constant mass of electrons which are part of the source oscillating structure. Thus relative to source light propagates in constant speed regardless of its wavelength. To produce light which propagates with different speed one must design charge oscillator with unconventional structure. The same applies to EM...


DIGITALLY CONTROLLED RF FRONT END STGAE IN RADIO RECEIVERS

Started by RealInfo in sci.electronics.design9 years ago 3 replies

Hi all How exactly the tuned circuit of the the RF stage in a digitally controlled radio reciver is controlled . I understand that the...

Hi all How exactly the tuned circuit of the the RF stage in a digitally controlled radio reciver is controlled . I understand that the local oscilator is based on a PLL , which is controlled by some micro controller . My question is how the front end tuned circuit is tuned to the relevant frequency which is local oscillator freq +/- IF freq ? Thanks Elico


Oscillator

Started by Anonymous in sci.electronics.design9 years ago 19 replies

Hi, Crystal 1 http://www.abracon.com/Resonators/ABM8G.pdf Crystal 2 http://www.mouser.com/ds/2/3/ABM8G-10572.pdf I am using...

Hi, Crystal 1 http://www.abracon.com/Resonators/ABM8G.pdf Crystal 2 http://www.mouser.com/ds/2/3/ABM8G-10572.pdf I am using the above mentioned Crystals with MSP430F5438AIPZ http://www.ti.com/lit/ds/slas655c/slas655c.pdf The micro used one of these crystals to generate 17 MHz clock. Is it a good idea to get that clock out of the micro on one of its pins and route it t...


PWM Sine Wave Inverter output problem

Started by Myauk in sci.electronics.design10 years ago 3 replies

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave...

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave Oscillator 2. An unity gain inverting amplifier to generate inverted sine wave 3. A Triangular wave generator 4. Two Sets of Comparators to generate PWM waveform for positive and negative cycles 5. Two Half Bridge IGBT Drivers to generate A and A' s...


Released version 0.3 of my rtl_sdr based spectrum analyzer software for Linux:

Started by Jan Panteltje in sci.electronics.design8 years ago

Released version 0.3 of my rtl_sdr based spectrum analyzer software for Linux: http://panteltje.com/panteltje/xpsa/index.html xpsa requires a...

Released version 0.3 of my rtl_sdr based spectrum analyzer software for Linux: http://panteltje.com/panteltje/xpsa/index.html xpsa requires a DVB-T USB stick, librtlsdr, libforms (xforms), fftw3, some other stuff. This one supports any mixers up front (heterodyne), you can set the local oscillator frequency positive or negative for add or subtract. There is now a small square pad wher...


2 component negative feedback oscillator and voltage "multiplier"

Started by Robert Baer in sci.electronics.design2 years ago 34 replies

Problems are: Spice version does not oscillate, and Spice LED voltage is not 3V. Go buy the Dollar Tree LED Flashlight and Lantern...

Problems are: Spice version does not oscillate, and Spice LED voltage is not 3V. Go buy the Dollar Tree LED Flashlight and Lantern Combination SKU: 286458 and see (do not forget it needs one AA cell). Version 4 SHEET 1 5945676 13421556 WIRE 2080 -592 1648 -592 WIRE 2080 -560 2080 -592 WIRE 2080 -496 2048 -496 WIRE 2176 -496 2080 -496 WIRE 1648 -480 1648 -592 WIRE 2048 -448 2...


strange oscillator

Started by Anonymous in sci.electronics.design5 months ago 43 replies

Not actually a Hartley, bacause the Ls are not coupled. Version 4 SHEET 1 1220 836 WIRE 528 112 288 112 WIRE 288 144 288 112 WIRE 288 272...

Not actually a Hartley, bacause the Ls are not coupled. Version 4 SHEET 1 1220 836 WIRE 528 112 288 112 WIRE 288 144 288 112 WIRE 288 272 288 224 WIRE 528 288 528 112 WIRE 400 368 288 368 WIRE 480 368 400 368 WIRE 400 416 400 368 WIRE 288 528 288 368 WIRE 400 560 400 496 WIRE 432 560 400 560 WIRE 528 560 528 384 WIRE 528 560 496 560 WIRE 400 608 400 560 WIRE 528 656 528 560 WIRE...