Patent ID: 9548715
Date: 2017-01-17
CPC Classifications: H01Q,H03H

Claim:
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 at least one of the impedance structures 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.