Phase control circuit

Details Phase control circuit Phase control circuit

H - Electricity

03

F

330/21, 350/59

H03F 3/45 (2006.01) H03G 1/00 (2006.01) H03H 11/20 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1089036

PHASE CONTROL CIRCUIT Abstract of the Disclosure A controllable phase shifting circuit comprises first and second differential amplifiers, each providing antiphase outputs and supplied respectively with first and second alternating reference signals which are in a first predetermined (e.g., quadrature) phase relation. A third signal, which is a fractional part of one of the first two signals, is combined with the other of the first two signals at its respective amplifier input to produce a fourth signal with a phase different from that of the first, second or third signals. A third amplifier provides differential gain control inputs to the first and second amplifiers. A combining circuit sums signal components from the first and second amplifiers to produce an output signal with a desired phase which is controllable in accordance with the gain control input signals. - 1 -

268156

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