Apparatus and methods for high voltage variable capacitor arrays with feed-forward capacitors

摘要

Apparatus and methods for high voltage variable capacitors are provided herein. In certain configurations, an integrated circuit (IC) includes a variable capacitor array and a bias voltage generation circuit that biases the variable capacitor array to control the array's capacitance. The variable capacitor array includes a plurality of variable capacitor cells electrically connected in parallel between a radio frequency (RF) input and an RF output of the IC. Additionally, each of the variable capacitor cells can include a cascade of two or more pairs of anti-series metal oxide semiconductor (MOS) capacitors between the RF input and the RF output. The pairs of anti-series MOS capacitors include a first MOS capacitor and a second MOS capacitor electrically connected in anti-series. The bias voltage generation circuit generates bias voltages for biasing the MOS capacitors of the variable capacitor cells.

主权项

1. An integrated circuit comprising:
a variable capacitor array including a plurality of variable capacitor cells electrically connected in parallel between a radio frequency (RF) input and an RF output, each of the plurality of variable capacitor cells having a capacitance configured to be controlled independently of another of the plurality of variable capacitor cells, wherein a first variable capacitor cell of the plurality of variable capacitor cells includes:
two or more pairs of anti-series metal oxide semiconductor (MOS) capacitors electrically connected in series between the RF input and the RF output, wherein a first pair of the two or more pairs of anti-series MOS capacitors includes a first MOS capacitor and a second MOS capacitor electrically connected in anti-series and electrically connected to one another at a first intermediate node, and wherein a second pair of the two or more pairs of anti-series MOS capacitors includes a third MOS capacitor and a fourth MOS capacitor electrically connected in anti-series and electrically connected to one another at a second intermediate node; anda first feed-forward capacitor electrically connected between the RF input and the first intermediate node to provide a feed-forward path from the RF input to the first intermediate node.