Driving circuit of power amplifier

Abstract

The present invention discloses a power amplifier driving circuit which includes two parallel-connected identical double end input-single end output power amplifier driving circuit paDrvI and paDrvII, and the input signal is across connected to form a power amplifier driving circuit with the double end input-single end output structure. The invention has the advantages of wide scope of working frequency, providing enough output power, good linearity, matching the output to 50ohm and easy integrating on the chip.

Description

technical field [0001] The invention relates to a radio frequency circuit, in particular to a power amplifier driving circuit. Background technique [0002] The last stage of the transmitter is generally a power amplifier, which outputs a certain amount of power to the antenna, and then transmits it into space. The power amplifier usually has limited power gain and 50 ohm input impedance, so it is required that the circuit before the power amplifier can output enough power to drive the power amplifier to meet the transmission power requirement. The power amplifier driving circuit is a circuit for realizing the above functions. [0003] At present, the power amplifier drive circuit mainly adopts single-tube common-source amplification or double-tube cascode amplification, and then uses an inductor, or an inductor-capacitor resonance circuit, or a choke coil as a load, and finally matches it to 50 ohms through an output matching network. The disadvantages of this drive circu...

AI Technical Summary

Problems solved by technology

The disadvantages of this drive circuit are: linearity and efficiency need to be further improved, need to use a matching network to match to 50 ohms, in differential applications, a differential to single-ended converter is required

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