A Novel Circuit Architecture for High Performance of High-order Subharmonic Mixers
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A Novel Circuit Architecture for High Performance of High-order Subharmonic Mixers Changfei Yao & Jinping Xu
Received: 2 March 2008 / Accepted: 19 May 2008 / Published online: 3 June 2008 # Springer Science + Business Media, LLC 2008
Abstract A novel circuit architecture for high performance of high-order subharmonic (SH) mixers is proposed in this paper. According to the specified harmonic mixing order, one or more mixer diodes sub-arrays and corresponding power divider as well as phase shift network for RF and LO signals are arranged in the circuit. This proposed SH mixer circuit has improved conversion loss, wide dynamic range and high port isolation for high-order SH mixers. By phase cancellation of idle frequencies, the proposed SH mixer circuit can eliminate complicated design procedure of idle frequency circuits; by phase cancellation of leakage LO power to RF and IF port, and leakage RF power to LO port, the mixer circuit can get high port isolation in LO-IF/RF and RF-LO. The increased antiparallel diode pairs in each sub-array will also lead to well performance by lowering effective series resistance. The proposed SH mixer circuit can be easily realized with power divider and phase shift network for RF and LO signals. Keywords Subharmonic (SH) mixer . Antiparallel diodes . High-order . Conversion loss . Dynamic range . Isolation . Harmonic balance analysis (HBA)
1 Introduction Millimeter and submillimeter wave SH mixers are widely used to extend the range of millimeter and submillimeter test and measurement equipments, such as spectrum analyzers, frequency counters, power meters and other instruments. SH mixers can lower the LOs frequency, which alleviates the difficulty in getting high performance and expensive high frequency MM-wave oscillators. The conversion loss, isolation and dynamic range are important factors for many application systems. The research works on SH mixers have a long history from earlier crossed waveguide configuration to recently Supported in part by National Natural Science Foundation of China (NSFC) under Grants 60621002 and in part by NSFC under Grants 60471017.
C. Yao (*) : J. Xu State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China e-mail: [email protected]
Int J Infrared Milli Waves (2008) 29:748–757
749
hybrid integrated and monolithic configuration, from earlier one diode to recently antiparallel diode pair SH mixers.[1–19] Most of the published papers concentrated on the work of low conversion loss, high isolation and low-order SH mixers. To the best of our knowledge, there are few published references on high-order and wide dynamic range SH mixers. In this paper, we proposed a novel SH mixer architecture, in which proper power divider and phase shift network for RF and LO signals are designed for idle frequency components utilization. According to the analysis of the proposed circuit model, comparing with general designed SH mixers by one antiparallel diode pair, this circuit apparently have the advantage of improving conversion loss b
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