University of Twente Student Theses


AM/PM Conversion in transceiver systems

Zanten, S. van (2017) AM/PM Conversion in transceiver systems.

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Abstract:One nonlinear effect in transceiver systems is the phase modulation at the output due to amplitude modulation at the input (AM/PM conversion). This research has focussed on characterizing these effects in a simplified model to gain insight that can be used to synthesize better transceiver systems. To this end, a first-order low-pass RC-circuit with a nonlinear capacitor has been presented as a simplified equivalent circuit to heterojunction bipolar transistors (HBTs) for the modelling of AM/PM conversion effects in transceiver systems. Two different analyses have been performed to characterize the AM/PM conversion effects in this simplified RC-circuit after which the impact of circuit parameters on the effects has been identified. Theoretical analysis in both the frequency and time domain indicated that the AM/PM conversion effects in the first-order low-pass RC-filter could be reduced by reducing either the value of the resistor, the value of the third-order nonlinear capacitance constant or the input frequency. Simulations have verified these claims, but have also shown that the cut-off frequency plays a major role in the accuracy of the theoretical approximations.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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