| 摘要 |
An image reject apparatus for covering a broad range of signal systhesis frequencies is provided with a digital phase shifter having an input for receiving modulated signals at twice the desired output frequency. A modulator comprising a power divider having a radio frequency (RF) input, a pair of mixers coupled to the outputs of said digital phase shifter and to the outputs from said power divider provides mixer output signals which are combined to produce sum and difference product signals as desired side band signals.
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