We have developed and experimentally demonstrated several new RSFQ circuits, designed as components for digital receivers that are being developed by HYPRES. The first circuit is a digital phase generator, which produces a periodic digital signal with a controllable phase shift. This signal is obtained by decimation of an external high frequency signal by a factor of 1024, and provides a controllable phase shift with digital precision of 512. The second circuit, a precise digital static

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... y divider, is capable of dividing of an input signal frequency by any integer value between 1 and 1024. The third circuit is a digital quadrature mixer performing digital downconversion of bit-stream data. This report presents results of experimental evaluation of these circuits at speeds in excess of 30 GHz.