Programmable capacitor array structure

Abstract

The invention discloses a programmable capacitor array structure. The structure comprises a capacitor array which comprises two stages of capacitor arrays distributed at the two ends of a single-polemulti-throw switch, and corresponding capacitors of the two stages of capacitor arrays are reversely connected to the two ends of the single-pole multi-throw switch in series and used for providing different capacitors for each radio frequency switch branch of the single-pole multi-throw switch and combining the capacitors to obtain more different capacitance values; a single-pole multi-throw switch which comprises a plurality of radio frequency switch branches and is used for selectively connecting each capacitor branch of the capacitor array between the radio frequency input port and the radio frequency output port under the control of the control logic module so as to provide a radio frequency path; and a control logic module which is used for generating grid voltage and source-drain control signals required for switching on and switching off each radio frequency switch branch of the single-pole multi-throw switch under the control of a system control signal.

Description

technical field [0001] The invention relates to a programmable capacitor array structure, in particular to a programmable capacitor array circuit which can improve the power distribution of the capacitor array and radio frequency switch, reduce harmonic nonlinearity and improve the quality factor. Background technique [0002] With the development of mobile devices, the antenna size is getting smaller and smaller, but the application frequency band and frequency band are getting wider and wider. Aperture Tuning (Aperture Tuning) and Impedance Tuning (Impedance Tuning) are often used together. Using a programmable capacitor array can be used in The antenna impedance can be tuned in a wide range to realize high-efficiency reuse of antennas in multiple modes and frequencies. figure 1 It is a schematic diagram of aperture tuning and impedance tuning. The aperture tuning circuit is connected between the antenna ANT and the ground, and the impedance tuning circuit is connected bet...

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