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A CMOS IQ Digital Doherty Transmitter using modulated tuning capacitors | IEEE Conference Publication | IEEE Xplore

A CMOS IQ Digital Doherty Transmitter using modulated tuning capacitors


Abstract:

This paper presents a new approach to increase the output power and to enhance the drain efficiency of Direct Digital RF Modulators (DDRM). Two differential four-phase DD...Show More

Abstract:

This paper presents a new approach to increase the output power and to enhance the drain efficiency of Direct Digital RF Modulators (DDRM). Two differential four-phase DDRMs are organized in a Doherty-like configuration using two different transformers. The modulated tuning capacitors concept is proposed to achieve a high efficiency at maximum output power and at back-off. To demonstrate this principle, a 2 GHz IQ Digital Doherty Transmitter with on-chip transformers has been integrated in 90 nm CMOS Technology. The digital IQ transmitter achieves a maximum output power of 24.8 dBm with 26% drain efficiency and 26% drain efficiency at 6 dB back-off. With a 10 MHz RFBW multi-tone OFDM signal, the transmitter consumes 176 mA from a 2.4 V supply. It achieves 18.8 dBm RMS output power with 18% average drain efficiency.
Date of Conference: 17-21 September 2012
Date Added to IEEE Xplore: 10 November 2012
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Conference Location: Bordeaux, France

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