elhep/FMC_SDR

FMC_SDR_XFE Power Supply

Opened this issue · 1 comments

tprzywoz commented

IC18:

  • VCC should be 3.3 V (not 5 V). And it cannot be connected to the line whose activation it potentially controls.

  • check TX_NSHDN_ISO signal. Some power supply ICs have floating RUN/Enable pins which are connected only to this signal by 'Undefined' jumpers.

  • detail: change net labels - TX_NSHDND_N to inverting input output (IC18 and IC14) and TX_NSHDND_P to noninverting IO. I know it's control signal but maybe add termination resistor.

All LT1763 with 3V3 output:

  • Configuration is 3,5 V, Power Port name is 3.3 V

IC17

  • wrong ADJ configuration (now is 5 V)

IC26

  • wrong SET configuration (now is 2.4 V, should be 20 V)

IC2

  • floating RUN

  • details: add some notes about configurations (RT MODE) and please connect input capacitors the same way as output on schematic.

BUCKBOOST_OUT
image

  • FE_12V can't be an alternative power source for PA_LDO which output should be 20 V.

IC5:

  • wrong ADJ configuration (now is 3.5 V)

IC11

  • detail: double GND power port on pin 1

J5

  • add a note about voltage and current

Rest:
image
I wonder if we should move the input capacitors behind the jumpers.

Please change the power names to the standard convention if possible (like P3V3_description). And don't use '-' for negative voltage. 'N' is much better. Also power symbol for positive supply should point up and those for negative supplies should point down (now most of them on FrontEnd_PS point right)

tprzywoz commented

And as I wrote in the email to remember: implement bias-up/down procedure for amplifiers.