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This paper presents an 18-to-32 GHz voltage-controlled phase shifter in a compact surface mount package for both 40- and 100-Gb/s optical transceivers. The InP HBT phase shifter chip includes a wideband vector modulator and a pseudo-sine-cosine generator that enables 810° phase control with only one control voltage. A quadrature splitter using a polyphase filter with Cherry-Hooper amplifiers enables...
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