Digital modulator with digital power control circuit

Details Digital modulator with digital power control circuit Digital modulator with digital power control circuit

H - Electricity

04

B

H04B 7/26 (2006.01) H03G 3/20 (2006.01) H04L 27/20 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2081154

A digital modulator comprises a power control circuit for producing a digital power control signal, first and second digital multipliers for multiplying digital signals having orthogonal phase relationships with the digital power control signal, and first and second digital-to-analog (D/A) converters for converting digital output signals from the first and second multipliers into analog signals. First and second low-pass filters are connected to outputs of the D/A converters, respectively, to filter out high frequency components. An orthogonal modulator is provided for mixing orthogonal phase carriers with the outputs of the first and second low-pass filters to produce first and second orthogonally modulated signals and combining the modulated signals to produce a transmit signal, which is amplified for transmission.

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