4 FAQs about Signal base station power supply design

What are output signal phase noise & Spurs?

Output signal phase noise and spurs are the two key performance metrics used to compare different power supply schemes in this reference design. In order to achieve optimal phase noise performance, supply VDDCLK1 with a low-noise LDO (like TPS74401 or TPS7A8300), and power up all the other power rails with DC/DC switchers.

What is a 3G base station converter?

In a 3G Base Station application, two converters are used to provide the +27V distribution bus voltage during normal conditions and power outages.

What is a preferred power supply architecture for DSL applications?

A preferred power supply architecture for DSL applications is illustrated in Fig. 2. A push-pull converter is used to convert the 48V input voltage to +/-12V and to provide electrical isolation. Synchronous buck converters powered off of the +12V rail generate various low-voltage outputs.

What is a stabilized supply?

The design of stabilized supplies has been simpli- fied dramatically by the introduction of voltage regu- lator ICs such as the L78xx and L79xx - three-terminal series regulators which provide a very stable output and include current limiter and thermal protection functions. Figures 16, 17 and 18 show how these circuits are used.

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