Phase shifting circuit
AssigneeSanyo Electric Co., Ltd.
InventorNobukazu Hosoya
Life of this patent
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Abstract
The present disclosure relates to a phase shifting circuit for shifting the phase of an alternating circuit, which comprises a series-connected circuit of a resistor, and a capacitor for passing the alternating signal therethrough, a pair of differential amplification circuits each connected with the resistor and the capacitor, and a transistor for combining two alternating signals obtained from the pair of differential amplification circuits each controlled by a constant current source, whereby the combined alternating signal obtained from the transistor is shifted for some degrees.
Claims4
A phase shifting circuit for shifting the phase of an alternating signal applied to thereto said phase shifting circuit comprising:
- a. a phase shifting means having two electrical elements connected in series, the phase characteristics of a first of the electrical elements being different from that of the second electrical element and wherein one of the electrical elements is a capacitive element, whereby the phase of said alternating voltage signal across the first electrical element is different from that across the second electrical element;
- and wherein input signals of opposite polarity are applied to each end of said serially connected electrical elements.
- b. a first differential circuit including first and second transistors interconnected at a first common terminal, and having first and second input terminals connected with said first electrical element for amplifying a first signal which is obtained from the voltage drop across said first electrical element;
- c. a second differential circuit including third and fourth transistors interconnected at a second common terminal, and having third and fourth input terminals connected with said second electrical element for amplifying a second signal which is obtained from the voltage drop across said second electrical element;
- d. means for combining said first signal from said first differential circuit with second signal from said second differential circuit;
- e. a constant current source means connected to each of said first common terminal and second common terminal, and connected to reference voltage point;
- and
- f. means for controlling a conductivity of said constant current source.
Dependencies are inferred from the claim text.