Abstract
We have proposed a new “hybrid” envelope elimination and restoration(EER) transmitter architecture using an efficiency optimized power amplifier(PA) and modified bias modulator. The efficiency of the PA at the average drain voltage is very important for the overall transmitter efficiency because the PA operates mostly at the average power region of the modulation signal. Accordingly, the efficiency of the PA has been optimized at the region. Besides, the bias modulator has been accompanied with the emitter follower for the minimization of memory effect. A saturation amplifier, class F?¹ is built using a 5-W PEP LDMOSFET for forward-link single-carrier wideband code-division multiple-access(WCDMA) at 1-㎓. For the interlock experiment, the bias modulator has been built with the efficiency of 64.16 % and peak output voltage of 31.8 V. The transmitter with the proposed PA and bias modulator has been achieved an efficiency of 44.19 %, an improvement of 8.11 %. Besides, the output power is enhanced to 32.33 ㏈m due to the class F operation and the PAE is 38.28 % with ACLRs of －35.9 ㏈c at 5-㎒ offset. These results show that the proposed architecture is a very good candidate for the linear and efficient high power transmitter.
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