A 2.4GHz to 1.5 GHz down converter layout, and VCO internals.

Started by Jan Panteltje in sci.electronics.design3 years ago

A 2.4GHz to 1.5 GHz down converter layout This is basically a VCO, mixer, and voltage stabilizer: ...

A 2.4GHz to 1.5 GHz down converter layout This is basically a VCO, mixer, and voltage stabilizer: http://panteltje.com/pub/2.4_GHz_to_1.5_GHz_converter_IMG_4645.JPG The screw in the trimpot will allow fine adjustment of the output frequency from outside the box. After using this 964 MHz VCO in several projects, finally a pad (VCO in) broke off. Had to open it... removed the cover: ...


HCT4046 VCO noise

Started by GBaars in sci.electronics.design7 years ago 17 replies

For narrow (fdev ~ 0.05 %) FM detection the phase noise of the CD74HCT4046 PLL's VCO causes poor S+N/N ratio. Has a smaller / larger oscillator...

For narrow (fdev ~ 0.05 %) FM detection the phase noise of the CD74HCT4046 PLL's VCO causes poor S+N/N ratio. Has a smaller / larger oscillator C any influence and also the values of R1 and R2 of the VCO. Do the 74HC(T)7046 or 74HC(T)9046 perform any better?


phase noise of a current starved vco phase noise with LT spice

Started by Anonymous in sci.electronics.design3 years ago 2 replies

hello! i am working on DPLL,CSVCO is a part of this,i need help how to determine the phase noise of that VCO with LTSPICE

hello! i am working on DPLL,CSVCO is a part of this,i need help how to determine the phase noise of that VCO with LTSPICE


50 kHz VCO w/sine output

Started by George Herold in sci.electronics.design6 years ago 96 replies

30kHz to 100kHz VCO with sine wave output. I know this has been covered before in previous threads. The obvious way to do this is a digital...

30kHz to 100kHz VCO with sine wave output. I know this has been covered before in previous threads. The obvious way to do this is a digital signal generator (DSG) IC with maybe an A-D to measure the voltage. I=92ve not done much digital stuff in a while, so this has a bit of a learning curve. But if anyone has some good chips to look at or app notes then please do share. I've been loo...


Will it work?

Started by Jan Panteltje in sci.electronics.design4 years ago 1 reply

Some chips arrived, had not had a lot of time to work on this: http://panteltje.com/pub/anything_transmitter_IMG_3793.GIF But placed some...

Some chips arrived, had not had a lot of time to work on this: http://panteltje.com/pub/anything_transmitter_IMG_3793.GIF But placed some stuff, tested the VCO, changed the circuit to put the FIFOs in series.. http://panteltje.com/pub/transmit_anything_component_layout_IMG_3834.GIF Actually there is going to be a 10dB attenuater pad between VCO and that QAM modulator on the right, and 1...


Unused mod input on VCO

Started by bart in sci.electronics.design8 years ago 4 replies

Hi all, I have an obsolete (no data sheet available) Z-Comm VCO that I'm using for a low buck signal generator. Yes, I know it's noisy &...

Hi all, I have an obsolete (no data sheet available) Z-Comm VCO that I'm using for a low buck signal generator. Yes, I know it's noisy & unstable. It looks like there's a Vmod input on it. I'm mounting this to a "slash & cut" PCB - surface mount. I couldn't find any documentation at Z-comm on their N suffix VCOs. My question is, do I solder the unused Vmod to ground or just leave the pad o...


[?] Audio VCO design

Started by David Chapman in sci.electronics.design8 years ago 20 replies

As part of a larger system, I need to design and build an audio VCO which will produce tones ranging from around 50Hz to 4KHz or so when...

As part of a larger system, I need to design and build an audio VCO which will produce tones ranging from around 50Hz to 4KHz or so when the applied DC input voltage changes from 0.5volts to 2.5volts. This will be used simply as a tuning aid for visually impaired users so the actual voltage/frequency relationship, and waveform produced, is not at all critical. Supply voltage of th...


A 2.4GHz to 1.5 GHz down converter layout, and VCO internals.

Started by Jan Panteltje in sci.electronics.design3 years ago

A 2.4GHz to 1.5 GHz down converter Its working! This is basically a VCO, mixer, and voltage stabilizer. Added the resisistors and...

A 2.4GHz to 1.5 GHz down converter Its working! This is basically a VCO, mixer, and voltage stabilizer. Added the resisistors and capacitators, some not wireless connections too: http://panteltje.com/pub/testing_2.4_GHz_to_1.5_GHz_down_converter_IMG_4655.JPG Note the disconnected coil, its basically a protection for DC coming back via the LNB cable from the sat receiver in case a ...


HC4046 VCO Spice Model Updated

Started by Jim Thompson in sci.electronics.design3 years ago

The HC4046 VCO Model on my website has been updated with a behavioral version (the device-level version is still included). You can find it...

The HC4046 VCO Model on my website has been updated with a behavioral version (the device-level version is still included). You can find it at... HC4046_VCO.zip on the Device Models & Subcircuits Page of my website. As always, comments/criticisms welcome. ...Jim Thompson -- | James E.Thompson | mens | |...


VCO and PLL sync

Started by John Fields in sci.electronics.design7 years ago 8 replies

> http://www.youtube.com/watch?v=ZYL3j27sSH8 --- JF

> http://www.youtube.com/watch?v=ZYL3j27sSH8 --- JF


CD4046 Question

Started by Chris in sci.electronics.design7 years ago 23 replies
VCO

The data sheet just gives some ancient reference for finding the values for R1, R2, and C1. Is the RC network for the VCO is (R1, R2, C1)? ...

The data sheet just gives some ancient reference for finding the values for R1, R2, and C1. Is the RC network for the VCO is (R1, R2, C1)? Would I just use the cutoff frequency for the R1 and C2 RC filter (i.e. fc=1/(2*Pi*R1*C1)). Thanks, Chris KQ6UP


How to make a Voltage Controlled Oscillator

Started by Cem Uzunoglu in sci.electronics.design4 years ago 122 replies

Hello all, What is the simplest VCO that can be done with off-the-shelf components? It doesn't have to be very fast. Audio range is...

Hello all, What is the simplest VCO that can be done with off-the-shelf components? It doesn't have to be very fast. Audio range is fine. Cheers, Cem


MAX038 replacement

Started by Christian Riesch in sci.electronics.design8 years ago 6 replies
VCO

Hi, I am looking for a VCO with sine output like the MAX038, which is unfortunately no longer available. Thank you for your help. Best...

Hi, I am looking for a VCO with sine output like the MAX038, which is unfortunately no longer available. Thank you for your help. Best regards, Christian


Low frequency analog VCO with sinewave output?

Started by davew in sci.electronics.design6 years ago 84 replies
VCO

I'm searching for a simple one chip solution if anyone has any ideas. Best I've found so far might be the old 8038 function generator chip.

I'm searching for a simple one chip solution if anyone has any ideas. Best I've found so far might be the old 8038 function generator chip.


Ceramic capacitors

Started by E in sci.electronics.design8 years ago 14 replies

Just made oscillator from 74HC14, 1k resistor and Taiyo Yuden Y5V 10uF capacitor. Results: Capacitor other end biased to 2V => 126 Hz...

Just made oscillator from 74HC14, 1k resistor and Taiyo Yuden Y5V 10uF capacitor. Results: Capacitor other end biased to 2V => 126 Hz out At 36 V bias 2470 Hz out That means 1:19 change in capacitance! Maybe I can build some low frequency VCO out of these... Amazing things. -ek


Frequency-to-voltage converter, PLL with an AD650

Started by Jean-Pierre Coulon in sci.electronics.design2 years ago 10 replies

I tried to reproduce fig.22, p.17 of the datasheet but the output voltage is always about +13 V The VCO alone (like fig.12) works up to about...

I tried to reproduce fig.22, p.17 of the datasheet but the output voltage is always about +13 V The VCO alone (like fig.12) works up to about 1 MHz provided the input voltage is in the [-12:0] range. Has anybody a working schematics? Regards, -- Jean-Pierre Coulon


LM566 alternative.

Started by Kevin Glover in sci.electronics.design11 months ago 16 replies

I have benn trying to find a decent alternative to the LM566 VCO. It does not seem to be sold anymore at reputable sellers and the ones on EBay...

I have benn trying to find a decent alternative to the LM566 VCO. It does not seem to be sold anymore at reputable sellers and the ones on EBay (from China) I don't trust to be authentic or unrecycled. Does anyone know of a 8 to 16 pin alternative (just square and triangle out) that won't break the bank. Thanks -Slackmeister


PLL -- basic question

Started by vkj in sci.electronics.design6 years ago 17 replies

I have just started reading about PLLs. Most of the (introductory) material I have seen always starts with the phase as the detected variable. ...

I have just started reading about PLLs. Most of the (introductory) material I have seen always starts with the phase as the detected variable. And phase = Integral(freq). But why not use frequency itself? That is, why cant you determine the frequency (using a counter) and compare that with the desired frequency and thus generate an appropriate error signal to the VCO? Thanks, vkj ...


74HC4046 Model Development

Started by Jim Thompson in sci.electronics.design5 years ago 23 replies

I have been notified by Helmut Sennewald that the LTspice encryption process hides the node sequence. So please...

I have been notified by Helmut Sennewald that the LTspice encryption process hides the node sequence. So please revisit... http://www.analog-innovations.com/SED/HC4046_SUB.zip for a corrected version. This is just the VCO portion for now, and just the variable part; suitable only for LTspice. Please try it out and let me know your comments, etc. Since I'm new to working with LTsp...


UP/DOWN CHARGE PUMP CHIP

Started by piters in sci.electronics.design7 years ago 6 replies

Hi, I am working on a prototype PLL, and before implementing it in ASIC CMOS technology I would like to build one using off-the-shlef...

Hi, I am working on a prototype PLL, and before implementing it in ASIC CMOS technology I would like to build one using off-the-shlef components. A VCO can easily be found in analog PLLs, with tuning voltage input. I also need a classical Charge pump with up, down inputs. Do you know any commercial chips providing such a functionality? Kind Regards. --------------------------...