Mixing DAC architectures for a radio frequency receiver

Details Mixing DAC architectures for a radio frequency receiver Mixing DAC architectures for a radio frequency receiver

2008-04-15

2008-04-15

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S136000, C341S143000, C375S316000

Reexamination Certificate

active

11565492

ABSTRACT:
A receiver (300) includes a mixing digital-to-analog converter (DAC) (118A), a direct digital frequency synthesizer (DDFS) (132) and a dynamic element matching (DEM) circuit (304). A DAC of the mixing DAC (118A) is implemented as a segmented DAC having a thermometer encoded DAC section (120A) and a binary encoded DAC section (120B). The DDFS (132) includes outputs configured to provide bits associated with a digital LO signal to inputs of a switching section (124A,124B) of the mixing DAC (118A). The DEM circuit (304) is coupled between the outputs of the DDFS (132) and the inputs of the switching section (124A) that are associated with the thermometer encoded DAC section (120A). The DEM circuit (304) is configured to scramble the bits provided to the thermometer encoded DAC section (120A).

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