DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kwak, Tae-Woo | - |
dc.contributor.author | Lee, Min-Chul | - |
dc.contributor.author | Cho, Gyu-Hyeong | - |
dc.date.accessioned | 2008-07-28T05:38:11Z | - |
dc.date.available | 2008-07-28T05:38:11Z | - |
dc.date.issued | 2007-12 | - |
dc.identifier.citation | IEEE Journal of Solid State Circuits, Vol. 42, No. 12, pp2666-2676 | en |
dc.identifier.issn | 0018-9200 | - |
dc.identifier.uri | http://hdl.handle.net/10203/6564 | - |
dc.description.abstract | This paper presents a hybrid switching amplitude modulator for class-E2 EDGE polar transmitters. To achieve both high efficiency and high speed, it consists of a wideband buffered linear amplifier as a voltage source and a PWM switching amplifier with a 2 MHz switching frequency as a dependent current source. The linear amplifier with a novel class-AB topology has a high current-driving capability of approximately 300 mA with a bandwidth wider than 10 MHz. It can also operate on four quadrants with very low output impedance of about 200 m at the switching frequency attenuating the output ripple voltage to less than 12 mVpp. A feedforward path, a PWM control, and a third-order ripple filter are used to reduce the current burden of the linear amplifier. The output voltage of the hybrid modulator ranges from 0.4 to 3 V for a 3.5 V supply. It can drive an RF power amplifier with an equivalent impedance of 4 up to a maximum output power of 2.25 Wwith a maximum efficiency of 88.3%. The chip has been fabricated in a 0.35 m CMOS process and occupies an area of 4.7 mm2. | en |
dc.description.sponsorship | The authors would like to thank D.-H. Lee, W.-S. Nam, and J.-S. Paek for their assistance with the measurements. | en |
dc.language.iso | en_US | en |
dc.publisher | IEEE | en |
dc.subject | class AB | en |
dc.subject | dc–dc converter | en |
dc.title | A 2 W CMOS Hybrid Switching Amplitude Modulator for EDGE Polar Transmitters | en |
dc.type | Article | en |
dc.identifier.doi | 10.1109/JSSC.2007.908769 | - |
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