Abstract
In the previous chapter a discrete-time capacitive charge-based transmitter architecture was described. Using switches and capacitors, sizable packets of charge were controllably transferred from the supply to the output stage, which has the important role of increasing the signal output power before driving the subsequent Power Amplifier (PA). To provide the required output swing without degrading the signal’s harmonic performance, in most cases the PPA is supplied with a higher voltage, which increases both power consumption and cost, requiring technology features such as thick-oxide devices and additional voltage regulators. Also to avoid linearity degradation, in many cases the PPA is operated in Class-A mode, which also leads to a significant impact in power consumption. In fact, more than 50 % of the total amount of power consumed in the first charge-based TX was due to the PPA contribution.
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Notes
- 1.
The factor 2 is introduced because the RF load is connected twice to the baseband node per LO cycle.
Bibliography
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Paro Filho, P.E., Craninckx, J., Wambacq, P., Ingels, M. (2017). Resistive Charge-Based Transmitter. In: Charge-based CMOS Digital RF Transmitters. Analog Circuits and Signal Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-45787-1_4
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DOI: https://doi.org/10.1007/978-3-319-45787-1_4
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