Wave transmission lines and networks – Attenuators
Patent
1975-12-24
1976-11-23
Dixon, Harold A.
Wave transmission lines and networks
Attenuators
333 80T, H03H 744
Patent
active
039939685
ABSTRACT:
The one-port network here includes a pair of terminals and a single differential input operational amplifier having an output electrically connected through a resistor R3 to a first input of the amplifier, through a resistor R4 to a second input of the amplifier, through a resistor R7 to one terminal of the network, and through the series combination of the resistor R3 and a resistor R5 to the other terminal of the network which is also electrically connected to a ground reference potential. The second input of the amplifier is also connected to ground through a resistor r6. The first and second inputs of the amplifier are also electrically connected through the series combination of a resistor R1 and capacitor C1 and through a resistor R2, respectively, to the one network terminal. With the initial constraint that the conductance g7 of the resistor R7 satisfies the relationship ##EQU1## WHERE G CORRESPONDS TO THE CONDUCTANCE OF AN ASSOCIATED RESISTOR, THE IMPEDANCE PRESENTED ACROSS THE NETWORK TERMINALS CORRESPONDS TO THAT OF THE SERIES COMBINATION OF AN INDUCTOR AND A RESISTOR. Proper selection of element values produces an impedance across the network terminals which corresponds to a single inductor, a single resistor, or an inductor in series combination with a resistor of which the simulated element values may be positive or negative.
REFERENCES:
patent: 2968773 (1961-01-01), Sandberg
patent: 3219952 (1965-11-01), Saraga
patent: 3831117 (1974-08-01), Fletcher
patent: 3895309 (1975-07-01), Rollett et al.
Cannon Russell A.
Cool Leonard R.
Dixon Harold A.
GTE Automatic Electric Laboratories Incorporated
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