Telefonaktiebolaget LM Ericsson (publ)
SWITCHED CAPACITOR ARRANGEMENT FOR TUNING A DIFFERENTIAL CIRCUIT

Abstract:

A switched capacitor arrangement for tuning a differential circuit is disclosed. The switched capacitor arrangement comprises a first node, a second node and a third node. The switched capacitor arrangement further comprises a first capacitor (C1) coupled between the first node and the second node, a second capacitor (C2) coupled between the second node and the third node, and a first switch branch comprising a first switch (S 1) coupled between the second node and a signal ground node. The first switch (S 1) has an on state and an off state. The first node and third node are configured to be connected to respective differential nodes (Vtank, -Vtank) of the differential circuit. The switched capacitor arrangement is configured to tune the differential circuit by controlling the state of the first switch.