Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
If the DIP16 "module" is a standard 300mil width, 100mil pitch then consider ripping off a 74xx logic part of proper size for the geometry stuff and fix the pin names?
Failure-to-follow might be from an overloaded output
or bad bias rails or a bad input common mode position
or....
Debug time, not rando wild guess time.
VGND through 1Mohm will surely hurt the isolation amplifier's
HL slew and if the coupling is capacitive, you need slew rate
clean inside.
You must represent the two grounds locally-correct (per part
operational needs) and then represent the connection between
domains - shared earth, vacuum...
The rectifier matters, a lot.
Old true crystal radios used galena (PbS, a natural II-VI semiconductor) as a point-contact Schottky diode of low Vf and low shunt-C.
In the '70s I had one of those "spy pen radios" from the back of a magazine. Probably a germanium diode there, silicon costs you...
Last I looked at this was a couple of decades back
for RFID tags, at RX power levels you will lose all
the energy just trying to climb that front diode's
I-V curve and fall back. A charge pump is not the
same thing as a detector, and you are looking to
pull energy from as close to zero...
The trick for analog design would be to maintain constant
amplitude over varying frequency. And of course small
matters like intial accuracy, stability, distortion, drift with
environmentals, supply ripple FM-ing the output tone, etc.
If you wanted it all, something like an ADC feeding a
PLL...
The guts look like a 1-channel LM139. Nothing but a bare lateral PNP base contact at the input pins (and a back diode to help with "soft ESD" hot carrier drift). But by their nature the LPNP base also has the fat tank-iso junction which is fortunate for negative-going ESD and somewhat robust...
If it's a straight rip-off of LM331 then it may not have any ESD circuitry at all. Old standard linear bipolar parts just "took their lumps", lacking thin oxides and having large device sizes.
How much do you care about the voltage value and pulse flat-top?
Given that you want this capacity from the power supply and caps and no added circuitry the acceptable loaded droop at current for time gives you the bulk C value by the basic equation.
In my limited RF opinion Class E is all about the matching network and the output switch parasitics must be lumped in to that, while switch on resistance must not matter at the match network.
I observed the "real RF guys" spend a lot of time on the bench load-pulling, to dope out the...
I think there's something missing (or multiple). Seems to me that there has to be a phase where inputs are opened to sources and shorted across, to get the null input condition, or you need some belief that input is exactly 0 difference on average over the timescale of the filter.
At such a low frequency, seems like you could let the micro
execute any PWM and drive a basic MOSFET driver from a
logic output pin.
There are isolating MOSFET drivers now which might offer
some interconnection possibilities (like any-to-any cell
leveling) used with a FET or just for their...
5V supply won't get you out of UVLO.
Look into more modern PMICs in CMOS that can drive logic-level MOSFETs and like 5V input (POL DC-DC). ONSemi, TI, ST, et al, use disti selector tools?
The output high and low side switches want their
gates driven to make H, L and Z. You need a trivial
couple of gates for that decode and of course the
drive taper chain (inverters).
Used to be that "NTE" would sell individual bagged "replacement"
transistors at ham radio & TV repair places, had a faty cross
reference book and so on.
No idea whether they have survived the modern era or in what
form, where.
For older types often the discrete mfrs would have their own...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
