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    ELECTRONIC APPARATUS USING A VARIABLE REACTANCE CIRCUIT
    4.
    发明专利
    ELECTRONIC APPARATUS USING A VARIABLE REACTANCE CIRCUIT 未知

    公开(公告)号：YU239570A

    公开(公告)日：1977-08-31

    申请号：YU239570

    申请日：1970-09-29

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN ALAN ,  STEVEN ALAN STECKLER

    IPC: H03C3/14 ,  H03B5/02 ,  H03B5/08 ,  H03B5/12

    Abstract: 1317625 Variable reactance circuits, transistor amplifiers RCA CORPORATION 30 Sept 1970 [1 Oct 1969] 46438/70 Headings H3R and H3T A reactance, variable in response to a control signal comprises: a reactance 10; a circuit 20 for sensing the current through the reactance; and an amplifier 30, 40, having a gain dependent on the magnitude of the control signal 25, and being arranged to amplify the output current from the sensing circuit 20 and feed it back in parallel with the reactive element. The reactive element 10 may be the inductance of the resonant circuit 10, 12 of an oscillator which includes a positive feedback amplifier 14. A similar control circuit may be employed to vary the capacitive reactance, the two control signals being applied in push-pull, Fig. 4, (not shown). As shown, the output stage 40 of the current amplifier comprises a splitter, whose gain is varied by the control signal. In a modification, Fig. 5, (not shown), two splitters (40a, 40b), each controlled by push-pull control signals, are connected in cascade. Current amplifier and sensing circuit.-Variation in current at point 18 varies the current through resistor 228, the resulting change in potential across the resistor being fed back via transistor 234 to the base of transistor 224, thus varying the conductivity of transistor 224 to maintain the current through transistor 222 constant. The varying base potential of transistor 224 is also applied to the base of transistor 310 to produce a collector current I s which has a relationship to the magnitude of the collector current of transistor 224 in proportion to the relative base-emitter areas of the two transistors. As shown the collector current of 310 is one fourth that of 224 by virtue of the quadruple emitters of the latter. Transistors 310, 224, may be thermally coupled. In a modification, Fig. 3, (not shown), the circuit 20 is replaced by a single common emitter stage.

    SIGNAL-TRANSLATING STAGE
    6.
    发明专利
    SIGNAL-TRANSLATING STAGE 未知

    公开(公告)号：YU240970A

    公开(公告)日：1977-08-31

    申请号：YU240970

    申请日：1970-10-01

    Applicant: RCA CORP

    Inventor： STECKLER STEVEN ALAN ,  STEVEN ALAN STECKLER

    IPC: H03F1/56 ,  H03F3/343 ,  H03F3/34 ,  H03F3/347 ,  H03F3/45

    Abstract: A signal translating circuit includes a constant current transistor, a variable conduction transistor having a signal input terminal, and a feedback loop coupling the transistors. The collector-emitter paths of the transistors are connected in series across a voltage source. An output transistor is electrically and thermally coupled to the variable conduction transistor to provide an output current which is proportional to and at a predetermined phase relationship with the input current. The circuit is characterized by having both a low impedance current input, and a high impedance voltage input. The direct voltage level of the input can be selected for suitable biasing of the preceding stage. The circuit can be employed, for example, as a current sampler, a linear amplifier, a Q-multiplier, or a signal-matrixing circuit.

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