18800608. Tuning Range Enhancement by Negative Resistance (Telefonaktiebolaget LM Ericsson (publ))
Tuning Range Enhancement by Negative Resistance
Organization Name
Telefonaktiebolaget LM Ericsson (publ)
Inventor(s)
Tuning Range Enhancement by Negative Resistance
This abstract first appeared for US patent application 18800608 titled 'Tuning Range Enhancement by Negative Resistance
Original Abstract Submitted
A tank circuit includes a tunable resonator subcircuit having an effective parallel resistance that varies with tuning of the tunable resonator subcircuit. The tank circuit further comprises a variable negative-resistance subcircuit coupled in parallel to the tunable resonator subcircuit, where the variable negative-resistance subcircuit is configured to provide a variable negative resistance, so as to increase the effective parallel resistance of the tank circuit. A control circuit is configured to increase the negative resistance presented by the variable negative-resistance subcircuit in response to a change in the tunable resonator subcircuit that lowers the resonant frequency of the tunable resonator subcircuit.