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Design of DAC

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If I want to design a Switched-Capacitor Digital to Analog Converter front-end transmitter for CDMA application, can someone tell me where can I get the information about the design. (like the theory that involved, schematic, etc)

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The idea of a D/A is surrounded by the weighted ladder. Each sequence is able to produce a current that results in a voltage. But I am wary of this opamp configuration because of how it is used. The opamp is meant to operate high gain, even though it will operate as a constant current source. I would be tempted to change the configuration a little. You could probably use a transistor circuit and achieve what you want.

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