Electricity: power supply or regulation systems – For phase shift or control – Using a three or more terminal semiconductive device
Patent
1979-12-13
1981-03-10
Beha, Jr., William H.
Electricity: power supply or regulation systems
For phase shift or control
Using a three or more terminal semiconductive device
307262, 358 28, H04N 912
Patent
active
042557011
ABSTRACT:
Variable phase shift apparatus employing two transistors having their bases connected together and their collectors connected together. The input terminal is coupled to the emitter of the first transistor. A phase control arrangement of a capacitance and a variable resistance in series is connected between the input terminal and ground. The juncture of the capacitance and the variable resistance is connected to the bases of both transistors. A phase control signal is present at this juncture. The collector current in the first transistor is in phase with the difference between the input signal and the phase control signal. The collector current in the second transistor is 180.degree. out of phase with the phase control signal. The two collector currents are combined by flowing through a common load resistance to produce an output signal which is the resultant of the collector currents in the two transistors. By decreasing the variable resistance the collector current in the first transistor is increased and that in the second transistor decreased. By increasing the variable resistance the collector current in the first transistor is decreased and that in the second transistor increased. Thus by varying the variable resistance the phase of the output signal with respect to the input signal can be varied between 0.degree. and 180.degree..
REFERENCES:
patent: 3637922 (1972-01-01), Srivastava
patent: 3806794 (1974-04-01), Vidovic
Beha Jr. William H.
GTE Laboratories Incorporated
Keay David M.
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