Analysis and Control of Uncertainty in Wireless Transmitting Devices

This paper presents a mathematical approach to estimate the measurement uncertainty in wireless transmitting devices. Although there have been efforts to estimate the uncertainty in measurements of analog circuits, very few about the analytical estimation on wireless transmitter has been published. Therefore, the overall uncertainty in the output power of a transmitting device is presented in this paper from the circuit configuration. Based on the mathematical analysis on the sensitivity and the propagation of uncertainties, the total uncertainty in the output power with respect to the variation of input parameters such as the load impedance, and the DC supplies for the gate the drain bias are addressed. As a result, 5.63 % of uncertainty in the output power of a RF transmitter is estimated, to which the uncertainty at the gate DC bias contributes the most.

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