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====== SYMPOWER01A ======

The module creating a symmetrical power supply for analog constructions with operational amplifiers (e.g. SDRXO1B receiver). The input voltage should be +12V or +5V and output __respectively__ -12V and +12V.

==== Construction solutions ====

=== Charge pump ===

One of the possibilities, how to create a negative voltage, is to use a charge pump. There already exist specialised integrated circuits suitable for this purpose.

* [[http://www.linear.com/product/LTC3260|LTC3260]]

=== __Power inverter__ ===

One of the limitations of the charge pump is the impossibility to obtain larger supply currents. The problem can be solved using a transformer and wiring, that will __convert__ the input DC voltage to AC. Given that the converted voltage can be of significantly higher frequency than the usual 50Hz, the size of the transformer, having the same output, can be much smaller. The higher frequency also allows to reduce the __smoothing__ capacity.

Navíc v případě, že vstupní stejnosměrný potenciál je na vinutí transformátoru komutován sinusově, tak je značně potlačena možnost vyzařování rušení na rozdíl od klasického spínaného zdroje.

Použití transformátoru navíc přináší výhodu, že výstupní napájení může být galvanicky oddělené od vstupního.

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