Charge-based CMOS Digital RF Transmitters by Pedro Emiliano Paro Filho, Jan Craninckx, Piet Wambacq, Mark

By Pedro Emiliano Paro Filho, Jan Craninckx, Piet Wambacq, Mark Ingels

This booklet introduces a very novel structure which may sit back the trade-off present this day among noise, strength and quarter intake in a really compatible resolution for complicated instant verbal exchange platforms. in the course of the mix of charge-domain operation with incremental signaling, this structure provides the easiest of either worlds, delivering the lowered quarter and excessive portability of digital-intensive architectures with a better out-of-band noise functionality given by way of intrinsic noise filtering functions. Readers might be enabled to layout larger functionality radio front-ends that devour much less strength and region, specifically with appreciate to the transmitter and gear amplifier designs, thought of by way of many the “battery killers” on so much cellular devices.

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7). Again, the power transfer from the supply to the output load has to be done in a precisely-controlled and timely manner, demanding sufficient linearity and bandwidth. In a conventional voltage-output driving stage, more bandwidth is necessarily provided with a corresponding increase in transconductance. Circuit linearity, on the other hand, is typically leveraged by increasing the voltage headrooms and supply voltages whenever possible. In both cases, when stringent bandwidth and linearity requirements apply, the resulting DC power consumption implied by large bias currents and/or supply voltages can significantly impact the overall system efficiency.

The reconstruction filter significantly attenuates both noise and spurs at the RX-band increases the path loss toward the mixer input, and reduces the effectiveness of predistortion by filtering high frequency components added on purpose to compensate for frontend non-linearities. The choice of mixer topology has also an important impact in out-of-band noise performance. A large number of analog-intensive implementations apply traditional current mode Gilbert-cell active mixers to perform baseband upconversion.

5 Quadrature Direct-Conversion Transmitters 15 a sufficiently low spurious and noise emission, so as to support SAW-less RF transmitter implementations. The remainder of this book is organized as follows: Chap. 2 provides an introduction to the innovative concept of incremental charge-based operation. The main reasoning behind the charge-based operation and its operating principle are first explained using a watermill mechanical analogy. Second, with a “black-box” implementation of the envisioned charge-based architecture, the main benefits as well as the most important aspects involving noise and linearity performances are discussed.

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