Modified Broadband Ruthroff-Type Transmission Line Transformer Balun for Isolation-Enhanced Passive Mixer Design
Ding He, Zhentao Yu, Jie Chen, Kaiyuan Du, Zhiqiang Zhu, Pu Cheng, Cheng Tan
TL;DR
This paper introduces a modified Ruthroff-type balun to improve isolation in a high-frequency passive mixer used in transceiver systems.
Contribution
A modified Ruthroff-type balun with shunt capacitors and parallel coupled lines is proposed to enhance LO-to-RF isolation in passive mixers.
Findings
The mixer achieves 50 dB LO-to-RF isolation at 15 dBm LO power.
The design operates over 8–30 GHz with 7 dB average conversion loss.
The circuit is implemented in 0.15-micrometer GaAs p-HEMT technology with a compact area of 0.96 × 1.68 mm².
Abstract
Generalized broadband operation facilitates multifunction or multiband highly integrated applications, such as modern transceiver systems, where ultra-wideband bidirectional passive mixers are favored to avoid a complex up/down-conversion scheme. In this paper, a modified Ruthroff-type transmission line transformer (TLT) balun is presented to enhance the isolation of the mixer from the local oscillator (LO) to the radio frequency (RF). Compared to the conventional methods, the proposed Ruthroff-type architecture adopts a combination of shunt capacitors and parallel coupled lines to improve the return loss at the LO port, thus effectively avoiding the area consumption for the diode-to-balun impedance transformation while simultaneously providing a suitable point for IF extraction. In addition, a parallel compensation technique consisting of an inductor and resistor is applied to the RF…
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Taxonomy
TopicsRadio Frequency Integrated Circuit Design · Microwave Engineering and Waveguides · Full-Duplex Wireless Communications