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100 Mhz Amplifier

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27 Threads found on 100 Mhz Amplifier
Hello all! Well I don't know if this is even possible, but I thought I should ask anyway. I need a kind of special circuit for a friend. He needs a true noise generator with a spectrum of DC (if possible, if not 100-150Hz low frequency) up to 100mhz, at around 1W of power (so around 10 to 50mW of power would radiate from the antenna). He is (...)
Hi everyone, I am designing a class A power amplifier for frequencies from 100 mhz to 300 mhz in order to pass 100 mA in the load. I am facing some problems regarding: 1. Choice of the MOSFET and its thermal management; 2. I am using the LM324 for adjusting the drive signal but it has a very low gain (...)
Hi Everyone, am designing a class A power amplifier using a MOSFET at high frequencies 100 mhz - 300 mhz and I just want to pass 100 mA current in the load. But I am facing some problems regarding: 1. The MOSFET choice, thermal management is a problem; 2. I am using the LM324 for adjusting the drive (...)
Friends, I am gonna measure my 100 w PA at 6.78 mhz. Because I have not worked before with this much power, I need your help! First, I wanna use spectrum analyzer and an attenuator to see output power. What kind of connector should I use? Is SMA ok? Second, how can I produce a square wave to drive the PA (I need in input 1W power and 5 volt am
The complex modulations used today are looking for higher BWs than 10 mhz (even up to 100 mhz). This would be really a challenge for Envelope Tracking approach, which anyway has its own problems at even lower BW than 10 mhz (like failing TX Output RF Spectrum, and TX Noise Power in RX band).
I have two questions: 1. can your amplifier process the full baseband bandwidth of the input pulse train including DC component? 2. does your oscilloscope have e.g. a 50-Om input impedance? For 200 W, you should use a coaxial high-power load with 50 Ohm impedance, otherwise the LPF is bAdly
Referring to the drawing, I don't exactly understand the problem. It shows a current measurement at the groundeded counter electrode. Why do you want to measure the current twice? Bandwitdh of analog fibre channels with LEDs/analog receivers can be as high as 100 mhz. But the current amplifier/LED driver requires a floating power supply, (...)
Hello, i want to build a near distance low power pir sensor detector, basicly it should detect things moving in distance < 20cm...I looked around and found many circuits using an LM324 OpAmp like on this page
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 (...)
AD8309 | 5 - 500 mhz, 100 dB Demodulating Logarithmic amplifier with Limiter Output | Detectors | RF / IF ICs | Analog Devices AD8309 log detector on evaluation board for only $100.
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 (...)
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 (...)
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 Guys, I am simulating a VCO with the following design: Process: 0.18 um Tool: Cadence Spectre Topology:Three stage Differential amplifier (with symmetric load) Supply: 3.3V Frequency: 2.4GHz I measured the phase noise and it was -100 dbc/Hz at 10 mhz. Is this a good performance? I am using a DC control voltage of about 875 (...)
hi there, i want to step up 100 khz frequency to 30 mhz by multiplying it by Abt 30 mhz frequency... can any one tell me any easy method to MULTIPLY TWO HIGH FREQUENCY SIGNALS upto 30 mhz using opamps , transistors or extremely common ics??
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
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 (...)
hi all i need a design of multistage amlifier by this propeties: -2 stages only -small signal -any congiguration (CB,CE,CC) -gain=100 -band width(frequency response) is 5 mhz thanxxxxxxx
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
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
how to design resistant amplifier on short and open () frequency band 100 -500 mhz power 80W Thanks!
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 (...)
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.
What does mean 20 mhz? I see text that 20 mhz,50 mhz,100 mhz on oscyloscopes.
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 (...)
How would I go about matching this transistor to 50ohm, let say around 100mhz? I ask because the only impedance information on the datasheet is at 136mhz+. Many thank in advance
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