An integrated packaging hybrid power supply modulator for transmitter systems

A method is proposed for a hybrid power supply modulator (PSM) which consists of a wideband linear amplifier (LA), switching converters (SC), and a hysteresis comparator (HC) for an envelope tracking transmitter. By a compensation method of using a dual feedback network, the stability of the LA circuit is realized. A System in Package (SiP) structure based on separated gallium nitride (GaN) devices and the designed LA is proposed to achieve high performance, high reliability, and miniaturization. Ranging from-40 similar to 100celcius of operating temperature, the 3dB bandwidth of the proposed PSM can reach over 120MHz which achieves the maximum efficiency of 82% at an average output power of over 4W with 2.5 similar to 4.5V power supply. Using a long-term evolution (LTE) 10MHz quadrature phase shift keying (QPSK) with Peak to Average Power Ratio (PAPR) of 6.5dB at 225 similar to 512MHz, the envelope tracking transmitter is measured that the power added efficiency (PAE) is 58.95 similar to 66.96%, Error Vector Magnitude (EVM) is 1.7 similar to 2.36%.