Quadrature detector using a double balanced differential circuit

Details Quadrature detector using a double balanced differential circuit Quadrature detector using a double balanced differential circuit

1981-07-15

1984-02-14

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, 455214, H03D 314

Patent

active

044319703

ABSTRACT:
A quadrature detector comprising a double balanced differential circuit including a constant current circuit, and a phase shifter circuit. The constant current circuit comprises a plurality of transistors having their collectors connected together, their bases connected together and their emitters connected to a reference potential level through respective resistors. By the arrangement of the constant current circuit, a current density in the transistors is reduced, a noise generated by the constant current circuit is reduced and hence the S/N ratio of the quadrature detector is improved.

REFERENCES:
patent: 4362998 (1982-12-01), Watanabe et al.

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