A CMOS Hybrid Switching Amplitude Modulator for Class-E2 EDGE Polar Transmitters
نویسندگان
چکیده
Abstract A hybrid switching amplitude modulator for class-E2 EDGE polar transmitters is proposed. To achieve both high-efficiency and high-speed, it consists of a wideband buffered linear amplifier as a voltage source and a hysteresis-controlled switching amplifier as a dependent current source. The novel linear amplifier has a high current driving capability of approximately 160mA with a bandwidth wider than 7MHz. It can also operate on two quadrants with very low output impedance of about 300mΩ around the switching frequency attenuating the output ripple voltage. The output voltage of the hybrid modulator ranges from 0.3V to 3V for a 3.3V supply. It can drive an RF power amplifier with an equivalent impedance of 7Ω up to a maximum output power of 1.1W with a maximum efficiency of about 85%. The chip is fabricated using thick-oxide devices in a 0.13um CMOS process and occupies an area of 3.9mm.
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