H - Electricity – 03 – C
Patent
H - Electricity
03
C
332/50
H03C 3/22 (2006.01) H03B 5/12 (2006.01) H03B 1/00 (2006.01) H03C 3/16 (2006.01)
Patent
CA 1312125
ABSTRACT OF THE DISCLOSURE A frequency modulator is provided, in which, for instance, a video signal is used as a modulation signal. A differential amplifier is formed by first and second transistors. First and second load resistors are connected between respective collectors of the first and second transistors and a power supply terminal (A). A series circuit of first and second feedback capacitors is inserted between the collector of the first transistor and a base of the second transistor. A series circuit of third and fourth feedback capacitors is inserted between the collector of the second transistor and a base of the first transistor. The respective same electrodes of first and second variable capacitance diodes are connected with each other and the other electrodes thereof are connected respectively to a junction point of the first and second feedback capacitors and to a junction point of the third and fourth feedback capacitors. First and second resonance coils are con- nected between the respective other electrodes of the first and second variable capacitance diodes and a reference potential point. A modulation signal is applied to the same electrode junction of the first and second variable capacitance diodes, and oscillation output signals of opposite phases are obtained from the respec- tive collectors of the first and second transistors.
605133
Kameoka Fusahiro
Omoto Noriaki
Shogaki Toshihiro
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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