Analysis on high-order intermodulation of frequency multipliers with harmonic injection

Abstract

Abstract:For the successful transmission of complex signals through frequency multipliers, high order analysis of IMD responses for a frequency tripler is performed and the optimum solutions for the harmonic injection technique is presented to suppress the high order IMDs in the 3 rd zone. From the 7 th order analysis, optimum injection was found to suppress IMDs in the 3 rd harmonic zone and their optimum phases are shown to be apart by 180 degrees due to the even-ordered Volterra products of the injection. The measurement results showed IMD suppression better than 30 dB, which is consistent with the analysis and the simulated results.

A CMOS harmonic rejection mixer based on current mirror amplifiers

“…Then, the RF input of the unwanted channels is down-converted to a baseband located at the desired channel, which causes degradation of the signal-to-noise ratio (SNR) of a receiver. The use of a harmonic rejection mixer (HRM) is a solution to reduce odd harmonics [1,2]. However, the harmonic rejection ratio (HRR) performance of the HRM is degraded by gain and phase mismatches, and mismatches are sensitive to process, supply voltage, and temperature variations.…”