Radio-frequency amplifier digital bias circuit, method and communication equipment

Abstract

The embodiment of the invention relates to a digital offsetting circuit of a radio frequency amplifier. The digital offsetting circuit comprises a plurality of radio frequency amplifiers, a plurality of current detection resistors, an analog-digital converter and a gating module; the input end of the gating module is connected with the first partial pressure end and the second partial pressure end of each current detection resistor; and the output end of the gating module is connected with the input end of the analog-digital converter in order that one of a plurality of the current detection resistors is selected and is in electric connection with the input end of the analog-digital converter. The embodiment of the invention also relates to a digital offsetting method for the radio frequency amplifier, which comprises the following steps: according to gating control information, the drain electrode of the radio frequency amplifier is selected in electric connection; static working current output by the drain electrode of the current radio frequency amplifier is received; and the current static working current is compared with preset reference value and is adjusted to be equal to the preset reference value. The embodiment of the invention reduces the number of the analog-digital converter needed in the offsetting circuit, simplifies the circuit, saves distribution space of PCB and reduces material cost.

Description

technical field [0001] The invention relates to the communication field, in particular to a radio frequency amplifier digital bias circuit, method and communication equipment. Background technique [0002] The main performance indicators such as efficiency and linearity of the RF amplifier are closely related to its quiescent operating current (drain current). When the static operating current changes, the efficiency and linearity of the RF amplifier will change accordingly. In order to achieve the best performance index of the RF amplifier, it is necessary to fix its quiescent operating current at a specific value when designing the circuit. The adjustment of the quiescent working current is realized by adjusting the grid voltage, so one of the main functions of the digital bias circuit of the RF amplifier is to provide a stable grid voltage for the RF amplifier. However, with the passage of working time, under the influence of hot carrier effect (HotCarier Injection, HCI...

AI Technical Summary

Problems solved by technology

[0007] The first aspect of the present invention is to provide a digital bias circuit for radio frequency amplifiers, which is used to solve the technical defects of complex and high cost of materials in the existing bias circuits of multiple radio frequency amplifiers, so as to simplify the circuit and reduce the cost of materials technical effect

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