I'm working on portable signal processing unit for 3-axis fluxgate magnetometer. 1-axis Analog part consists of preamplifier, switchable HPF, fixed LPF, programmable gain amplifier with in-out offset control. I was thinking a lot about supply(dual supply +/-5V 60mA max for each rail). As I said, system is portable and is be powered from 8.4V accumulator- therefore voltage converter must be used. I see some ways:
1)Use Regulator 8.4v->5v then DC-DC converter(Traco etc.) with LC filters (here we have problems with ripple noise)
2)Use Regulator with Inverter(here we have problems with Inverter cause at higher load voltage dropout is around 650mV)
So I need some advice on voltage converters- what will be better to use in my signal processor in order not to lose overall system characteristics and perfomance.
1)Use Regulator 8.4v->5v then DC-DC converter(Traco etc.) with LC filters (here we have problems with ripple noise)
2)Use Regulator with Inverter(here we have problems with Inverter cause at higher load voltage dropout is around 650mV)
So I need some advice on voltage converters- what will be better to use in my signal processor in order not to lose overall system characteristics and perfomance.