The Bandwidth of the Abrupt-Junction Varactor-Frequency Doubler

The bandwidth of the nonoverdriven abrupt-junction varactor doubler is considered, where the bandwidth is defined as that range of frequencies over which the ratio of the output power to available power exceeds some constant
T_{\min}
, when driven by a source whose available power remains constant as the frequency is varied. Upper bounds on the bandwidth as a function of
T_{\min}
are derived for the lossless case. Networks are given which yield large bandwidths and their performance compared with the upper bound. Their performance is also given in the presence of loss.