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23 Threads found on edaboard.com: Isolation Buffer
I was in a situation that I had to use a 2.4 GHz VCO (0dBm output) with very poor load pull performances. I got almost 80dB isolation (and 10dB gain) using the following configuration: emitter follower (SiGe), 10dB pad attenuator, MMIC amplifier, emitter follower (SiGe). Using the onboard 10dB pad attenuator after the first buffer gave better band
I want to design an RF buffer amplifier(@4GHz) using a BJT amplifier device. I need this to provide a good isolation between two circuits(PLL and PA). I want to simulate this design I have an s-parm file, of a BJT device,provided by manufacturer at an operating bias. I donot have the SPICE model of this device. How to begin this design?
Hi I am working on a design where a DAC needs to drive an isolation amplifier as well as a MUX. The output of the MUX goes to an ADC. I wish to determine if the DAC can really drive those two devices properly or do I need a buffer or some other intermediate component. The components here are DAC -> AD7841 MUX -> ADG1406 ADC -> AD976 P
Kindly explain,why does a locked VCO o/p gets affected if its interfaced with a non-linear circuit like varactor based reftection type analog phase modulator? It has been observed that ,if isolation between the two circuits(VCO and modulator) is not very good(>50dB),you will get over modulated or imbalanced side-bands as shown in the figure.[A
The buffer stage is used to increase the sensor isolation by offering high impedance to input and a low impedance drive to the output load . The current load on sensor is a few microamps only whereas the drive can be a few milliamps ,,be linear and has wider range of functions .
As far as I understand, you don't intend isolation, so why using an opto isolator? There's also no need of an OP to buffer a digital signal. A complementary transistor switch (NPN+PNP) will do.
I would preferably think of a single BJT oscillators for a sine crystal oscillator. Depending on the required output power and load isolation, a second buffer/amplifier stage can be added. To achieve the intended output level with lower supply voltage, a circuit with output inductor is suggested.
RF2301 isolation amp
Does the isolation rules works only when such is required or it works always? I've defined isolation strategy for the outputs of one domain PD1 and placed relevant isocells on the outputs. But in the state table the domain is always on and doesnot go in to power-down mode so ideally the isolation will act like a simple (...)
Hi, I am looking for a buffer amplifier circuit at 4GHz,I need a very good isolation(better than 50dB) between locked VCO output(4GHz) and next stage (an analog phase modulator). Experimentally I have observed that 20dB isolator is not enough to isolate these two stages.I get over modulation ( 3 times of the expected modulation) when I c
Hello people, I'm designing an ECG circuit with a digital output that is supposed to be hooked up to an FPGA board, but I have a bit of a problem. My circuit operates at 5V, whilst the FPGA only operates at 2.5V and I also want to galvanically isolate the two. I initially thought I might be able to get an optocoupler to do the job, but it seems
Hi.. Can anyone tell me the implications of a connection class error? Im encountering it in my design where a buffer(conn_classc(y pin)=std power) is driving an isolation cell(conn_class(iso pin)=const_power))? Thanks. ---------- Post added at 07:51 ---------- Previous post was at 07:37 ---------- btw
The main reason of LO buffer is not only isolation from previous stage, but to provide a proper impedance at the LO mixer input (which indirectly affects mixer isolation). LC matching network in that place it will work, but is narrow band by definition. A lot of design engineers use there a pad attenuator to provide good wideband (...)
Not all the VCO?s on the market use a buffer at the output. The buffer improves the output impedance vs frequency of the VCO, improve the load-pulling, and improve the isolation between LO and following stages. The linearity of the buffer is very important to don?t distort the LO signal. For your relative high (...)
My circuit has an output impedance of 2.2KOhms and its output is fine. But when i connect this output to the input of another circuitry (whose input resistance is 22 Ohms) the signal gets attenuated. I have designed a buffer using a BJT. still the negative portion of the output gets clipped. plus the transistor heats up after a while. I als
My circuit has an output impedance of 2.2KOhms and its output is fine. But when i connect this output to the input of another circuitry (whose input resistance is 22 Ohms) the signal gets attenuated. I have designed a buffer using a BJT. still the negative portion of the output gets clipped. plus the transistor heats up after a while. I als
At the moment I try to make a galvanic isolated 1-wire slave system because i have problems with ground loops between 1-wire sensors and the master module. Does anyone have a solution to this? Google cant really give me any relevant information on galvanic isolation of 1-wire slave systems. Remember it has to be asolated at slave level so i cant
I want to know what characterisitics make a circuit a good buffer, 1. What should be ideal values of input and output impedances of buffer. and how it effects the isolation of load form the other circuitry. 2. Can a buffer circuit should also provide gain to drive a high load. 3. Any other circuit in addition to (...)
A better term to describe problem solution can be isolation rather than matching.
It also provdes isolation. Following an oscillator it makes the load have less effect on the oscillator frequency and amplitude.