| 摘要 |
There is disclosed a negative impedance converter for a matching circuit for matching an impedance of an antenna to an impedance of an RF source or load. The negative impedance converter comprises first and second transistors connected in a cross-over configuration. Each transistor has a source or emitter, a drain or collector and a gate or base, and each transistor further has a first biasing circuit connected to its gate or base. The first biasing circuit comprises a first DC biasing signal source and a first diode or a third transistor connected between the first DC biasing signal source and the gate or base. There is also disclosed a negative impedance converter for a matching circuit for matching an impedance of an antenna to an impedance of an RF source or load. The negative impedance converter comprises first and second transistors connected in a cross-over configuration, each transistor having a source or emitter, a drain or collector and a gate or base. The source or emitter of one transistor is configured as an RF input port and the source or emitter of the other transistor is configured as an RF output port. The drain or collector of the first transistor is connected to the gate or base of the second transistor and the drain or collector of the second transistor is connected to the gate or base of the first transistor. An impedance is connected between the drain or collector of the first transistor and the drain or collector of the second transistor. The negative impedance converter is further provided with a passive impedance adjustment network connected between the source or emitter of the first transistor and the source or emitter of the second transistor. |
