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Hello Luvu,
Your request is practicaly inposible ~2.3% working frequency . It is too wide range for any type of quarz crystal units. You have to change your solutions with alternative like PLL or DDs are.
XTASA
CLC4141 replacement
Hello,
I have task to make substitute for CLC414 with the similar IC. My first attempt with OPA4684 are catastrofic I obtain only oscillation
1. Is any IC direct replacement
2. How to stop oscilation I have 6 IC in raw.
Thank you very much in advance
XTASA
Dear Dopradar,
You can find a lot of literature with a lot of mathematics to explain nature of problem you interested. My explanation is going from simple fact that you have demodulate/MIX signal than we have multiplying two signals (for beginning ideal source and non ideal carrier)and...
RFSYSTEM,
One very easy and clean expalnation starting from natural noise which is -174 dBm/SQR Hz
For 1 Mhz bandwith is -174+10 log B=-114dBm minimum bandwith for 8 MHz bandwith OFDM TV is 10 MHz it is +10 dB which will give -104 dBm. for good receiving we have to S/N=12 dB + F(dB) of...
dual gate mosfet spice
Hello RF population,
Where I can find nonlinear model for commercial dual gate MOS FET types like BF996,BF998....or similar. Thank you very much for help in advance !
XTASA
Dear HRKHARI,
I shall try to explain nature of your problems. When you turn ON OSC all C and L are empty. If we have condition that is Aβ>>1 OSC(no Aβ>=1 or little higher than 1 this is only in steady state ) oscillation will start slowly until it arrive to steady state oscillation. During...
Re: highly linear vco
Hello Sven,
Your question is question general type or you have some specific frequency requirement. I made some extremely linear VCO voltage/frequency but is frequency depending solution.
Gl XTASA
Hello Prakash,
Pulling overtone oscillators are not good solution first and second range is very limited. Better crystal and oscillators are reducing pulling range. It is possible to increase pulling range but you have to sacrifice stability. What is your real task( frequency stability or...
Hello Snmeciut,
Please check Polyfet site you will find circuit with diodes which working well . I test it with a lot RF LDMOS transistors and if you calculate elements correct it works really fine with temperature.
GL XTASA
Hello somf0872,
Your HB model with lumped element(spacial case of distributed elements) work maybe problem is that you use infinite Q for lumped elements ? If it is case you can try with real Q you can expect from distribudet elements around 20-80 max. Real Q have to give quite different...
Hello Willem,
I think that your choice of BFG135A transistor as power amp for that levels is not good. Please specify your requirements and VCC /I which you can use in amp than we can suggest you a much better solution maybe:?:.
GL XTASA
Re: How the "attenuation pad" smooth out impedance
Hello Trashbox,
If you putting Pi or Tee attenuator between two stages you will improve isolations between them . Bigger attenuation better isolation. Physical explanation is a very simple. ATT decrease useful signal but also unwanted...
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