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

Started by Jan Panteltje in sci.electronics.design4 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.design8 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.design4 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.design7 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.design6 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...


[?] Audio VCO design

Started by David Chapman in sci.electronics.design9 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.design4 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.design4 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 | |...


CD4046 Question

Started by Chris in sci.electronics.design9 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.design5 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.design10 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.design7 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.


Frequency-to-voltage converter, PLL with an AD650

Started by Jean-Pierre Coulon in sci.electronics.design4 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


wideband FM demodulator

Started by John Larkin in sci.electronics.design1 week ago 54 replies

We're thinking of sending a wideband (say, dc to 50 MHz) signal using FM. The carrier could be in the 500 MHz to 1 GHz range maybe. I can...

We're thinking of sending a wideband (say, dc to 50 MHz) signal using FM. The carrier could be in the 500 MHz to 1 GHz range maybe. I can get the VCO. What's a good way to do the FM discriminator these days? I could homebrew a quadrature detector, with some resonator and an XOR gate or a mixer, but there must be some easier way to do it. Not being an RF type, I'd appreciate suggestio...


LM566 alternative.

Started by Kevin Glover in sci.electronics.design2 years ago 16 replies
VCO

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.design7 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.design6 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...


TS3002 Simulation Model

Started by rickman in sci.electronics.design6 years ago 4 replies

I'm looking at using this device as a low power VCO at 240 kHz. I would like to model it along with some of the associated circuitry, but the...

I'm looking at using this device as a low power VCO at 240 kHz. I would like to model it along with some of the associated circuitry, but the company doesn't provide a spice model. I was wondering if anyone knows how this thing works internally enough that a model could be created. http://touchstonesemi.com/products/ts3002 It's an interesting little gadget. -- Rick


2.4Ghz Oscillator

Started by Cursitor Doom in sci.electronics.design3 weeks ago 33 replies

Gentlemen, Has anyone got any ideas for a simple, low-power (milliWatt level) VCO for the WIFI band? Something with a minimal range of just a...

Gentlemen, Has anyone got any ideas for a simple, low-power (milliWatt level) VCO for the WIFI band? Something with a minimal range of just a few feet? I just want to ensure my phone can't access my home network WIFI unless I expressly allow it. TIA. -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part thr...


74HC4046 Model Development

Started by Jim Thompson in sci.electronics.design6 years ago

I have posted a first-pass attempt at a 74HC4046 model at... http://www.analog-innovations.com/SED/HC4046_SUB.zip This is just the VCO...

I have posted a first-pass attempt at a 74HC4046 model at... http://www.analog-innovations.com/SED/HC4046_SUB.zip 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 LTspice, please send me any error messages, so I can refine my skills > :-}