TUNABLE IMPEDANCE NETWORK

摘要

A tunable impedance network and a method for tuning the tunable impedance network are disclosed. In one aspect, the tunable impedance network comprises a plurality of transformers connected in series. Each transformer has a primary winding and a secondary winding. The transformers have a voltage transformation ratio of N:1 with N>1. An impedance structure, acting as a resonant circuit together with the inductance of the secondary winding, is connected at the secondary winding of each transformer. A control circuit or processor is configured to tune the imaginary part of at least one of the impedance structures so as to change its resonance frequency to mimic a reference impedance. The control circuit is further configured to tune the real part of at least one of the impedance structures so as to change its Q-factor to mimic the reference impedance.

主权项

1. A tunable impedance network comprising:
a plurality of transformers connected in series, each of the transformers having a primary winding and a secondary winding, each of the transformers configured to transform a voltage by a voltage transformation ratio of N:1 with N>1; a plurality of impedance structures, each of the impedance structures connected at the secondary winding of each of the transformers, each of the impedance structures configured to act as a resonant circuit together with the inductance of the secondary winding, wherein the impedance structure is a tunable passive network comprising at least one tunable resistor circuit and at least one tunable capacitor circuit, wherein each of the tunable resistor circuit and the tunable capacitor circuit comprise at least one transistor circuit.