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This paper presents a dual path 150 W Silicon LDMOS 2-stage RF power amplifier designed for WCDMA at 2.2 GHz. This device is capable of handling 2 times the UMTS band with flat RF performance. Under a 1 tone CW stimulus, this power amplifier delivers 150 W with a power added efficiency of 47% and 29 dB linear gain. A 2-stage compact Doherty amplifier constructed of an ldquoin-packagerdquo 2 times 75 W architecture is also presented, showing the versatility of this unique design. Using the device in a dual-path configuration, this Doherty circuit delivers an increase in drain efficiency of 9-12 points at 8 dB output backoff from P3 dB compression, compared to a circuit using the device in a 150 W, class-AB reference design.
Date of Conference: 15-20 June 2008