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1. (WO2018038651) BIASING CIRCUIT FOR CAPACITOR SWITCH TRANSISTOR AND METHOD THEREFORE

Pub. No.:    WO/2018/038651    International Application No.:    PCT/SE2016/050782
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Wed Aug 24 01:59:59 CEST 2016
IPC: H03B 5/12
H03J 5/24
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: KÄMPE, Andreas
Title: BIASING CIRCUIT FOR CAPACITOR SWITCH TRANSISTOR AND METHOD THEREFORE
Abstract:
A biasing circuit for biasing a switching transistor (T0), wherein the switching transistor is used for switching a respective capacitor cell (C0) into/out of a capacitor array, wherein the capacitor array comprises one or more such capacitor cells (C0 to CN), and wherein the capacitor array is coupled in parallel with a primary inductor (L1) to form an inductive/capacitive tank (LC-tank). The biasing circuit comprises a secondary inductor (L2) which is inductively coupled to the primary inductor (L1), the secondary inductor configured to provide a bias signal for biasing the switching transistor (T0).