PHASE_SHIFTER_WITH_EIGHT_OUTPUTS

Published:2009/6/24 22:39:00 Author:May | From:SeekIC

The circuit consists of eight cascaded identical cells, each cell being a dc-controlled active phase shifter. Because the dc control is common for all shifters, the circuit is adjusted by trimming RA so that the phase difference between V01 and Vi is zero. As a result, each shifter will introduce a phase difference of exactly π/r. The eight signals for PSK are available at the op amps' outputs. Phase accuracy is acceptable for 1%-tolerance resistors and 5%-tolerance 100-nF capacitors. Also, the amplitude of Vi (which is a 1700-Hz sine wave), should not exceed 1 V.



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