Electrically Tunable Switched-Line Diode Phase Shifters: Part 2: Multi-Section Circuits

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  • Author: Leo G. Maloratsky
Multibit switched line phase shifters [3, 10] can be used to vary the phase shift up to 360°. Digital phase shifters provide a discrete set of phase states that are controlled by two-state “phase bits.” The number of binary weighted phase shifting “bits” can be cascaded to realize a variable phase shifter covering the desired range. Typically, the phase shifters are placed in tandem, with progressively greater phase shift angles to provide phase angle selectivity. Each switched delay line comprises a plurality of fixed time delays, which are combined to produce successive increments of delay in response to binary control signals.