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77 Threads found on 100 Mhz Amplifier
hiiiiiiiii to all please i need low nois amplifier that cover the range 100 mhz. to amplify the signal that recieve from the antenna in fmcw radar.. thanx
Hey there! I'm about to design a 100 mhz - 6 Ghz LNA, but i'm still not sure which transistors to use. Any recommendations? Would be greatly appreciated. Thanks in advance!
Here's a 100 mhz amplifier using SD1127:
I am designing an amplifier at 2.45 GHZ (center frequency) using 0.35 ?m technology, but I have a lack of resources. The amplifier has a span about 100 mhz around the previous center frequency. It should have a gain about 20 dB to drive a 50 Ohm load. Can anyone direct me to the good resources about such topics (...)
It may be impossible to find a commercial quartz oscillator running directly at 200 mhz. But I saw some 100 mhz versions with TTL output. Then use a frequency doubler afterwards. Good frequency doublers are available from Mini-Circuits. You can also use a diode pair doubler and a 200 mhz amplifier to (...)
What does mean 20 mhz? I see text that 20 mhz,50 mhz,100 mhz on oscyloscopes.
What Frequency are you using? What power do you want at 100 meters? What is your DC rails? I would google your requirements.
Seems that the low freq. end of S21 has about 10dB atten instead of the 17 dB gain. My opinion is, that some (low freq transmission) circuit element (series capacitor, shunt inductor, etc) is the main problem, because at about 100 mhz the circuit should work, except if some above mentioned problem happens. Other possibility (as mentioned above) o
Hi, Can anyone please share a track and hold amplifier circuit design/schematic? I need one with the following specs: 1.8V supply output swing: 1.2V p-p gain: 6 dB approx. 200MS/sec THD > 70 dB @ approx. 100 mhz power as small as possible no restriction on opamp architecture any design, even close to these specs would do. i (...)
A gain of 100dB is 100,000 times the voltage. An FM radio receives 100mhz but it uses an oscilllator and mixer to reduce the signal to the IF frequency of 10.7mhz where an IC amplifies it many times. Since FM radio signals are usually small the RF amplifier uses a small amount of AGC (...)
Hi manju, I have a question regarding the findings of the values of the decoupling capacitors.I have my frequency as 100 mhz.. Should I just take Xc as 50 ohms and calculate..? Should it be of same value at both the input and the output? Thanks in advance Santom Added after 6 min
Hi everybody, I'm having a little troubling simulating the harmonic distortion for a MOSFET differential amplifier with ADS. I am trying to calculate HD2, HD3, and the point at which the apparent gain drops by 1dB all for a 50mV signal at 100 mhz. I set up the circuit and added the Harmonic Balance simulation block and set it up everything (...)
Hi! i am working on the design of photodiode transimpedance amplifier of 100mhz using OPA657 Opamp. The first time when i switched on the power to the circuit, there were high frequency sinusoidal oscillations of about 10Vp-p. These Oscillations were removed after i tuned the feedback capacitor to 1pF. But the problem is that oscillations of (...)
I doubt that LTSpice is anything better than PSpice in analysis of RF circuits. You should however consider, that BD135 isn't designed for RF applications and that even it can be used at 100 mhz with some restriction, the supplied transistor model surely doesn't exactly represent all parameters of interest. Package parasitics aren't included in sta
Hello I need to make a transistor amplifier which has a voltage gain of 15 at 100 mhz. I have the BFR520 NPN wide band transistor (fT = 9 GHz). 1. Is it possible to make this amplifier using general calculations (by calculating RB1, RB2, RE, RE for common emitter amplifier) or do I have to go for an (...)
Dear all. Hi. I have a two stage complementary amplifier circuit constructed by CMOS 90nm. Three figures are attached. The first one is the schematic of the amplifier, and the second one is the location of the poles and zeroes of the circuit in an s-plane. Fig. 1: Schematic 86984 Fig. 2: s-plane 86986[/A
For high frequency RF amps (Fc> 100 mhz), the aerial is normally connected by a bit of Coaxial cable that matches the aerials impedance -in the range 50-75 ohms. In this case you still want a voltage amplifier, but if the device is matched to the low impedance, then extra gain or linearity can be got at no no expense, such as using a (...)
To refer to suitable FET OPs: For a lower supply/output voltage range, OP356 is fine, for higher range OPA656 or THS4631. Only the latter can achieve full 100 mhz power bandwidth, however. For best pulse transmission and higher power bandwidth, I would probably accept the finite input impedance of a bipolar amplifier and adjust the input (...)
If I understand well, your design freq. is 5.5 GHz and your design is not stable in the freq range of 100 - 400 mhz. In this case the problem freq. range is about a decade lower than the design frequency. In this case it is very easy to "place" resistors (shunt or series) to get the design stable in a manner that in practical terms the resistors
It must be RF power amplifier . As far as 10 and 100 % ASK both used it should be mode a-b amplifier . VHF transistors must be OK if are not speciall pupose .
Hi, I'd like to build kind of communication system. I've got many things working at 77 GHz for Automative but the problem is IF frequency is up to 100 mhz only. Any source for components at 5.8 GHz like oscillator and modulator ?? Regards
Dear Shaq, The Opamp parameters are decided by: 1. Gain - should be very high. If the gain error is expected to be around 01% or 0.01, then the gain for an N-bit DAC should atleast be 2^N*1/Gain Error. So for a 8 bit DAC, the gain should be about 2^8*100 = 128*100 = 12800 or about 80 dB. High gain would also reflect into lower input referred
Hi, Look at and select amplifiers they have one that is cheap and will give you some 100 - 200 mWatt output power !. I would use the HMC482ST89 since it cheap and lot's of power in a small SOT89 enclosure. Only an R and L + 2 C needed. Paul.
Hi. I am designing a tuned common emitter RF amplifier at about 100 mhz. How does one match the high collector output impedance to a low load resistance? I did a simulation and the collector impedance is rather large, about 100 kohm. How do you match this to say a 50 ohm load? Is it necessary really to match the (...)
how to design resistant amplifier on short and open () frequency band 100 -500 mhz power 80W Thanks!
Hi if i'm true - the FM is ~100 mhz and AM is ~1mhz.... 20 cm wire is capacitance ~2pF +~mOhms resistors at 1mhz and ~Ohms resistors at 100mhz Your need high impedance input amplifier to get voltage from such antenna at 1mhz and You can use 50 Ohm input (...)
Hello I have a doubt in the Book "Design of Analog CMOS Integrated Circuits" by Behzad Razavi Chapter 8 Page 253 Figure 8.10 Cascade of two 100 mhz feedback apmlifiers able to provide faster response Ok as shown in the figure 8.10(Left) what will happen if we choose f 3db = 100mhz for 20 mhz (...)
Hi all! I'm just looking for the all-in-one device suitable for every purpose buffer amplifier with high bw (bw >100 mhz) for driving high loads (< 100R) at a voltage of 5Vpp . I already found a nice discussion at diyaudio comparing BUF634, HA5002 and several other devices. That
The linear design with s2p files for Q1/Q2 is using a bias of VCE = 4.78 V, IC = 9.81 mA for Q1 and VCE = 10 V(?), IC = 16.5 mA for Q2. But the bias in the real circuit seems to give approx. VCE = 3.5 V, IC = 11.5 mA for Q1 and VCE = 4.3 V, IC = 21 mA for Q2. This should be easy verified using a voltmeter. Incorrect bias gives different S-paramete
Do I have ADS? No, thank god! Like I said earlier, how do you intend to have the dc-dc converter respond fast enough to the modulation envelope. Your dc-dc converter is probably 1000 times too-slow.
Hi, I need design of some class AB or C power amplifiers (10 Watt) for <100 mhz 1) what companies produce transistors? 2)what practical considration needed? 3) have you any document or picture of power amplifier at this bands? thanks
Hello I am having trouble with this question Design a PMOS load common source amplifier to provide a gain of 40db and unity gain frequency of 100 mhz I have tried a combination of gm/Id and hit and trial and am unable to meet both the constraints.
I would like to ask one question: when i check the stability of CMBF loop. There is peak shows in both loop gain and phase margin plot. I can not know the reason. Could you help me ? As the peaks occur at relatively high frequencies (100 mhz region) it seems to be a result of parasitic capacitive feedbacks. But - is
Hi aviaden, you should use a capacitor in series with the 390 ohms. Thus, you have for dc 100% feedback (dc gain of unity). Thus, the input bias of 2.5 volts is transferred also to the output. Then, notice the highpass characteristic of your circuit.
I am looking for a 100V 50-100W sine wave generator at 5-7 mhz, any suggestions? Btw I don't want to use an amplifier.
The load won't have the said impedance over the full 10 to 100 mhz range. (Near to technically impossible). You also didn't tell, if the PA is standard 50 ohm or different. A VWSR instrument is the best method to check the matching condition over the full frequency range.
Hello everyone, I am completely new to the forum, in fact I was motivated to join after reading some of Webdog's old posts (hope he is still member) regarding ENI high voltage broadband RF amplifiers. Is there a possibility to obtain some detailed schematic of one of those amplifiers ? I got some service manuals from E&I (they provide docume
Hi guys I'm designing a gain boosted opamp and I have a few doubts: 1) What is the typical gain at low frequency and GBW of a gain boosted opamp? 2) Does the gain boosted have to be fully differential? Is there a way to convert it to single-ended output? According to the Razavi's book, a gain boosted opamp as a similar gain to the two-s
100 mhz signal bandwidth normally implies 50 ohm impedance matching. 12V can mean 12 V into 50 ohm load (12 Vrms, Vp or Vpp ?) or 12 V unloaded output voltage. Depending on the intended generator output waveform, a more detailed amplifier specification should be given. E.g. do you need DC capability?
Features of WJ-A19-1 are:(1)available in surface mount; (2)high output power: +22.5 dBm typ; (4)high third order I.P.: +35 dBm typ; (4)medium noise figure: 6.0 dB typ. The absolute maixmum ratings of WJ-A19-1 can be summerized as:(1): stroage temperature is -62℃ to +125℃; (2):
I need to make some tests with RF amplifiers up to 100 mhz and 1kw. I have some troubles finding a suitable attenuator/dummy load at this powers, with a reasonable price. I need around 40db attenuation for attenuator. Could it be done with two resistors like RF500BA15A (johanson mfg) mounted in paralel used as first resistor in a pi (...)
based on my experiences very simple transistor circuitries can sound outstanding I agree, that they may cut out op circuits above some 100 mhz. A double integrator will need at least two transistors, anyway.
But BLF871 is 100 W transistor and it has 24 W with DVB-T modulation so I think that is overdesigned , 1 W is enough for me. And what was power consumption ?
I'm trying to design a transimpedance amplifier to work from about 300kHz to 100 mhz, using the OPA657 from TI. A side project was to learn MWO, which I have never used. I tried to do a voltage annotation for all the nodes and don't quite like what I see... I should clarify that the OPA657 subcircuit was imported from spice into MWO's own (...)
What you need is a fast LED driver. 10 ns means 100 mhz, so you need a RF power amplifier. You do not offer any details of the LED you use. IR LEDs typically require 2..3 V and the current is important to know for a specific LED. A small LED lights with 10-20 mA, high-power LEDs need one amp. Depending on duty cycle, you may (...)
DC bypass capacitance has to be sized based on the nature of your modulation. If your modulaiton is non-constant envelope and broadband, say 100 mhz wide, your external capacitance can be more modest. But if your modulation is narrowband, like 100 KHz wide, then the time domain envelope will be varying at a 100 KHz rate, (...)
Your posts are raising two questions: - conditions to achieve stability with capacitive load - required OP parameters for 100 mV AC @ 20 kHz I'll start with the second point. I can't follow your slew rate calculation, but you can easily calculate the required output current. I calculate about 0.25 A for 100 mV and 20 kHz, so it's obvious that
Hi SOUMYA Suppose that you have a class C amplifier that tuned to the F/2 , and you gave to the input of that , two signals , a first one ( for example ) 100 mhz and the other one is another wave ( such as another 150 mhz or a bit higher or lower ) then the out put will be F/2 . but most of the time , the better result (...)
Apart from the problem of stable loop gain addressed by LvW, you should consider that's almost useless to increase amplifier gain above the practical limits set by input noise and offset drift. Precision OPs are designed with DC gains of 120 to 160 dB, there's little chance to improve it further by designing cascading amplifiers. Composite am
When it is stable and has sufficient S/N ratio when filtered with a 50...100 mhz wide filter, you may put it (after filtering) into a clipping circuit. If phase must be stable under varying input signal, you should use a non-voltage-saturating circuit (ECL like circuitry?). The reason for this is that propagation delay will depend on drive level.