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1. (WO1980000769) HYBRIDE ELECTRONIQUE SENSIBLE A LA FREQUENCE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims
1. An electronic hybrid circuit (Fig. 1) comprising a transmit port (12),
a receive port (11),
a bidirectional access port (10)
an unbalanced-to-balanced signal conversion circuit (14) connected between said receive port and said access port,
a balanced-to-unbalanced signal conversion circuit connected between said access port and said transmit port,
a differential amplifier (16) having inputs connected to said receive port and the output of said balanced- to-unbalanced signal conversion circuit and an output connected to said transmit port,
CHARACTERIZED BY
a frequency-sensitive, voltage-controlled matching impedance (13) connected between the output of said unbalanced-to-balanced signal conversion circuit and said access port.
2 . The electronic hybrid circuit according to claim 1
CHARACTERIZED IN THAT
said matching impedance (13) comprises at leat one Thevenin equivalent source (Fig. 3, 37 or 38) impedance connected in series with one terminal of said access port.
3. The electronic hybrid circuit according to claim 1
CHARACTERIZED IN THAT
said matching impedance comprises at least one Norton equivalent source impedance (Fig. 4, 57 or 58) connected in shunt with said access port.
4. The electronic hybrid circuit according to claim 3
CHARACTERIZED BY
a floating power supply (Fig. 10, 107) means (113, 114) for isolating said hybrid from direct current levels outside of said hybrid,
means (110) for adding the voltage of said power supply to signals introduced into said hybrid, and
means (111, 112) for subtracting the voltage of said power supply from signals leaving said hybrid.