Patent ID: 6348830
Filing Date: 2002-02-19
Classification: H03D

Abstract:
A non-linear device for combining a first signal having a first frequency and first, second, third and fourth drive signals each having a second frequency approxinately one-half the first frequency to obtain an output signal having a third frequency, the device comprising:a first circuit section having an input port to receive the first signal wherein the first signal can either be a single-ended or a differential signal; and a second circuit section having first, second, third and fourth drive ports adapted to receive the first, second, third and fourth drive signals, respectively, wherein the second drive signal is approximately 180Â° out of phase with respect to the first drive signal, and a fourth drive signal is approximately 180Â° out of phase with respect to the third drive signal; the first drive signal is approximately 90Â° out of phase with respect to the third drive signal and the second drive signal is approximately 90Â° out of phase with respect to the fourth drive signal; wherein the first and second drive signals form a first differential signal and the third and fourth drive signals form a second differential signal, the first and second differential signals being driven in quadrature or are approximately 90Â° out of phase with respect to each other; the first circuit section and the second circuit section are connected together to generate first and second current signals approximately 180Â° out of phase with respect to each other and each having a frequency approximately twice the second frequency and equal to the first frequency and to generate the output signal at the third frequency which is based on the first signal at the first frequency and the first, second, third and fourth drive signals at the second frequency.