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Recent content by afz23

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    SMA Connector - Not work - Is there any way to solve it?

    Get some information from hfss animation plot. You will come to know if RF signal is able to reach the microstrip through SMA connector or getting reflected back at connector itself. The RF signal is suppose to travel to the other end of the microstrip.
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    [SOLVED] Shunt reactive loading of a series resonator

    Hi Guys , Thanks for your response. Finally I could derive expression for 'Xshunt' mentioned as Xp in the derivation. This I am posting for the benefit of our forum members. Pl note that original query was to derive expression for shunt reactance to get desired loaded Q of series resonator...
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    [SOLVED] Shunt reactive loading of a series resonator

    thanks Tony, I would like to re-frame my question as per the attachment in my initial query. If an inductor has Qu=120, I wish to have overall Q of this series inductive circuit, i.e. QL=15 in a 50 ohm system. Now one way to get the desired QL is by adding shunt capacitors on both the...
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    [SOLVED] Shunt reactive loading of a series resonator

    Thanks Tony for giving an insight on the resonator functioning and taking time to upload/share these interesting graphs which you use for estimating RLC parameters. You mentioned that series RLC require much lower source and load impedance to preserve the Q ,whereas parallel RLC require much...
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    [SOLVED] Shunt reactive loading of a series resonator

    Hi , I was reading about a simple resonator design and found a relation of shunt reactance to set loaded Q of series resonator in a 50 ohm system to a desired value. I tried a few times,but some how I am not getting this 'Xshunt' relation,when I solve it on my own. Same relation is mentioned...
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    Min and Max data rates for BPSK signal

    After BPSK demodulation , we require SNR of minimum 9.5dB.
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    Min and Max data rates for BPSK signal

    I am trying direct BPSK on a 1GHz carrier signal . The signal will be transmitted via air medium using an antenna. I have some limitation on radiated power level, so I can not have high data rates as it will reduce available RF link margin. I wanted to reduce the data rate and see upto what...
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    vibration degrades phase noise of PLL

    You are right, FvM, first thought that came to our mind was crystal oscillator, but we removed it from PLL module and fed reference from bench signal source(which was not subjected to vibration),the phase noise degradation signature of locked carrier still repeated, that is why we are looking...
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    vibration degrades phase noise of PLL

    Thanks KlausST for your advice. I will look for these answers in the forum for ' piezo effect of capacitor '. I hope we have capacitors with low or zero piezo effect.
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    vibration degrades phase noise of PLL

    Hi KlausST Thanks for your reply. Any PLL circuit will have loop filter elements? such as capacitors and resistors, and we do use ceramic type for the purpose. Can you suggest some differnt capacitor type, which won't show sensitivity to vibrations and shocks? We see phasenoise degradation in...
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    vibration degrades phase noise of PLL

    We observed phase noise degradation of PLL generated frequency carrier ,when we subjected the module for random vibration levels. What elements can be suspected for this vibration sensitivity? How can we damp these vibrations as phase noise degradation will impact data transmission quality.?
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    Remote programming ,read back and default program setting

    Thanks Barry I have time constraint to implement this,it would be great help if you can give some reference of similar application or at least explain with block schematic for both microcontroller and latch based approaches.
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    Remote programming ,read back and default program setting

    Hi, I have a task to remotely program frequency selection bits of a RF transmitter. The transmitter provides a 16 bit selection pins interface.I accomplished this task by making a serial to parallel bit converter circuit using some general purpose digital ICs . I send a 16 bit frequency select...
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    Delay between +VCC and -VEE supplies of opamp

    Thanks Klaus for your comments. Can you please suggest a comparator IC ,which can handle upto 10Mbps data rate?
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    Delay between +VCC and -VEE supplies of opamp

    It's a single ended output, which is driving IF port of mixer. Its mixer as a BPSK modulator, which receives carrier at LO port and gives modulated output at RF port. - - - Updated - - - I am using AD8001 as comparator.
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