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Recent content by itayd100

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    What are the differences between wave generator and oscillator? (Specific design)

    Hey c_mirta, I'm not changing the frequency - the frequency is always the same (75Mhz), C1 is the only value that changing. I'm trying to get the same result that I got with the function generator (1) with the HCMOS oscillator (2). Do you have any idea how?
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    What are the differences between wave generator and oscillator? (Specific design)

    Thanks for the answer. I know hot to change the frequency while running (in the AC analysis), but I don't know how to change the value of a capacitor while running. How can I do that? "You have an impedance matching problem" - buffer should be the solution? If yes, what kind of buffer will be...
  3. I

    What are the differences between wave generator and oscillator? (Specific design)

    Hello, I design the attached circuit: 75 MHz Sine wave that connected to R and C in parallel The output, the amplitude of the sine wave, is changing according to the C, more capacitance smaller amplitude of the sine wave. When I tried that in the lab I got 2 results: 1. When I connected the...
  4. I

    Noise on the GND from oscillator

    Hey, I attached a ferrite bead on the VCC and the GND lines and it doesn't seem to filter the signal.
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    Noise on the GND from oscillator

    Hey Tony, This is my schematic(right up - GND): What size of resistor or RFC would you recommend? - - - Updated - - - Hey, What is a good HF return?
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    70MHz peak detector/amplitude detector

    Hey E-design, I used the BAT54S because that's what I had. Shouldn't be a problem in the circuit, no? Thanks for the book. I'm learning.... Can you upload a picture of your board?
  7. I

    Noise on the GND from oscillator

    The weird thing is that I connected the probe to GND and the ground crocodile also to the GND and I got the signal around the zero. When I connect the probe to VCC and the crocodile to GND I got the same signal 3V higher. Yes, I have in the scope high impedance, but when I connected the probe...
  8. I

    Noise on the GND from oscillator

    Hello, I connected an oscillator to 3V3 and ground. I'm getting the signal, but I'm also getting a lot of noise on the ground. I tried to connect a diode between the GND to the GND of the oscillator but it still doesn't work. In the picture: the yellow is the output of the oscillator and the...
  9. I

    70MHz peak detector/amplitude detector

    Hey E-design, First, I appreciate your help! I built the circuit on a proto-board with 2 BAT54WT1G (see the pic). I see that you got a good result, I'll try to see if I did a mistake. Anyway, I'll order it on a PCB. Second, I tried to connect it to HCMOS clock 66.66 MHz with 3Vpp and get the...
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    70MHz peak detector/amplitude detector

    Hey E-design, I looked again and my schematic was wrong, I connected it like the top schematic in the picture.
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    70MHz peak detector/amplitude detector

    Hey @E-design, First, thank you very much for your answer. I built the circuit with the components that I had (like the pic) and I'm getting this reading on the scope (you can look at the pictures). I get 5V+ half of the amplitude, can I get rid of the 5V? What will be the best way? I would...
  12. I

    Trying to work with LMH6628 op-amp

    Hey FvM, Thanks for your schematics. I tried the one with the single power supply and that's what I get:
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    3th overtone for crystal (21MHz-->64MHz)

    Hey FvM, I read about that. Where should I place the parts (inductor and capacitor)? What should be the size of them?
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    Trying to work with LMH6628 op-amp

    Hey Klaus, I changed it to +/-2.5V. And added capacitor of 1nF between the input and pin 3(+ of the op-amp). And again, I just want any setup that will make it work. If I'm doing something wrong, just tell me. Still new in analog circuits. - - - Updated - - -
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    3th overtone for crystal (21MHz-->64MHz)

    I selected 2n3904 as Q1. For the crystal parameters, I used this tool: **broken link removed**
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