CMOS based Tunable Matching Networks for cellular handset applications

The state-of-the-art in silicon-on-sapphire components for antenna tuning

“…R on refers to the chan In a switched capacitor bank, t series with the capacitors. As such direct impact on the quality factor ( the R on C off product is fixed for a giv that decreasing R on will increase decreased tuning ratio (C MAX/ C MI With this in mind, it follows that th are inversely proportional to Q relationship between tuning ratio a process nodes suitable for DTC dev parameter is a combination asitic capacitances in the off wer R on C off product enables TC [2]. the switches are placed in h, the switch FET R on has a Q) of the DTC.…”

Tuning Range and Power Handling Analysis of DTC-based Matching Networks for Reconfigurable High Power RF Circuits

“…After being launched into the market, tunable bandpass filters using DTCs as tuning elements are gradually reported in the literature [10][11]. In addition, DTCs can also be used for reconfigurable matching networks as reported in [12]. Figure 1 depicts capacitance tuning in a DTC.…”

SOI CMOS tunable capacitors for RF antenna aperture tuning

“…Tunable capacitors (TC) are generally used to shift down the resonant frequency as needed [4]- [6]. TCs can be placed on the radiating element (aperture tuning), which causes a miniaturization effect, or between the antenna port and the RFFE (impedance tuning) to correct antenna impedance changes that occur, for example, when the antenna is close to the user's body [7]. SOI CMOS technology, which provides low ON-state resistance and OFF-state capacitance switch devices [8] in addition with high-Q inductors and capacitors, represents a cost-effective solution for low-loss high-power TC integration.…”