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Is there a way to use an external frequency input as the LO of an SDR?
For example, send in 120MHz signal and the SDR outputs the spectrum near 120Mhz?
The external frequency input could be an M/N ratio of the carrier frequency.
I would like a VCO or VCO PLL combination which can voltage tune from about 90Mhz to 210MHz.
The closest item is TLC2934, reaches >130MHz , going "last time buy"
I thought such chips were common place at one time, now they are going extinct.
There are other solutions, but this is the easiest...
I have some circuit ideas that I would like to work on with a partner. Some are fairly specific product ideas, others are circuit innovations that could become products. Mosf of my ideas have a strong analog component, so that skill is welcome. I am primarily an analog person, so I...
I am looking for a chip or module which can convert a battery voltage to 3.0V out (possibly 5V out) at about 20mA.
Efficiency is very important.
Vin may be greater or less than Vout, so buck-boost, SEPIC, others?
Currently using LTC3531.
I wonder if there is a more efficient part for this...
I am using orcad to generate a pcb netlist for Design spark pcb.
Parts that are simulated with a subcircuit (opamps) have primitive = no for simulation, primitive = yes for pcb netlist. This controls the hiearchy descent in the netlist generation. Is there a way to
get proper netlists without...
The gain margin is evaluated where the gain is 1, not at s=0.
An intuitive way to think of it is this: the phase delay at the inverting input is about equal to the open loop phase divided by the excess gain. For an opamp, the OLG is usually much greater than the loop gain at low frequencies...
Thanks for all the discussion. You offered several ideas I had not considered, like the switched cap converter and phase shift oscillator, and helped identify components to choose from.
The class 2 transformer is definitely the easiest design (and proven to work). The biggest drawback is...
It will be a 12V wall adapter (AC to 12Vdc). It could even be 15V or 18V wall adapter. One reason for this is that it solves the safety problem. I do not have to design Class I or Class II if I start out with low DC voltages.
That makes sense. There is no component inductor, but you still have rapidly changing voltages and the currents in the stray L of pcb traces and components. It would be interesting to see a quantitative comparison
between switched cap and push-pull at the same voltage and power levels.
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There will be an auxiliary DC input (banana jacks?) so the user can use batteries or other DC sources.
So far main transformer to linear regs is the only approach proven to work.
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