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The operation mode will be continuous wave, so there wont be intermittent high currents. As for the good filtering, do you have any example or reference design?
- Thanks
Due to power supply restrains, I have to raise the input voltage level (DC) to power a PA that's gonna be working in the UHF range.
What precautions should I look into before attempting this, such as maybe harmonics, some special kind of filter at the output, separated grounds, or stuff like...
betwixt, I still quite don't get the use of R6:
Below is an image of the Colpitts oscillator which I believe most closely matches the one implementer in the transmitter
My question is how R6 (82K) resembles a ground there? (as in the Colpitts oscillator in the image)?
And what's the use of...
I'm trying to understand a fm transmitter (attached as an image), which I built and works fine. However, there are a couple of issues I'm trying to figure out (all of them regarding the 2nd part, the first part I figured it's a preenfasis filter):
1. I'm assuming it's a Colpitts oscillator...
Re: Metallic screwdriver effect on trimmer (variable capacit
I'm using a freescale LDMOS PA module, don't have the exact model at hand, but it was something like MWxxxxxxx
Re: Metallic screwdriver effect on trimmer (variable capacit
I ended up redisigning the output matching network, after breaking one of the PCB tracks after much soldering / desoldering (now it has wider tracks, and more vias all around). Now I't works like a charm, and I get to keep my fingers...
Re: Metallic screwdriver effect on trimmer (variable capacit
The problem isn't the metallic screwdriver (if anything, they help to pinpoint the design fault). Still, It's good advice :)
I'll get to redesign the PA, though there isn't much I can do other than trial and error; the data provided...
Im currently designing an RF PA (in the range of 750Mhz, 10W output)
The output matching circuit to the antenna consist of segments of transmission line and variable capacitors (trimmers).
Originally, the PA oscillates, so I try adjusting the trimmers. The thing is, I don't have a plastic...
I'm designing the last stage of a PA which is to operate at 700MHz (around 50Mhz bandwidth) at 10W. Due to availability, It´s convinient to use the BLF544, which according to the datasheet can be made into a 960Mhz 20W PA.
However, looking at the S parameters downloaded from NXP (which are...
Hi,
I´ve been reading the AN154 from Agilent to understand the S parameters. However, There´s one thing I can´t figure out:
One one part, it defines the reflection coefficient (gamma) as the following:
"Another very useful relationship is the reflection coefficient, Gamma. This is a measure...
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