0.13‐μM CMOS Q‐band leveled‐LO subharmonic mixer with injection‐locked frequency‐divider quadrature generator

Su, Jun-Ming; Meng, Chinchun; Wu, Po Yi; Huang, Guo Wei

doi:10.1002/mop.24714

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Balun Optimization1

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2013

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“…The balun consists of two offset broadside coupled spiral transformers. Contrary to most other reported miniature spiral type Marchand balun designs, e.g., [11][12][13][14][15][16][17], our design adds five shunt capacitors externally to the spiral transformer structures. The lumped element equivalent circuit model of the spiral type Marchand balun configured as a symmetrical four port network is shown in Fig.…”

Section: Balun Optimizationmentioning

confidence: 96%

A 38 to 44 GHZ Sub-Harmonic Balanced HBT Mixer With Integrated Miniature Spiral Type Marchand Balun

Johansen¹,

Krozer²

2013

PIER

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Abstract-This work presents an active balanced sub-harmonic mixer (SHM) using InP double heterojunction bipolar transistor technology (DHBT) for Q-band applications. A miniature spiral type Marchand balun with five added capacitances for improved control of amplitude and phase balance is integrated with the SHM. The measured results for the SHM demonstrates a conversion gain of 1.2 dB at an RF frequency of 41 GHz with an associated LO power of 5 dBm. The conversion loss remains better than 3 dB from 38 to 44 GHz. The LO to IF isolation is better than 42 dB within the bandwidth of the mixer and confirms the excellent balance of the integrated spiral type Marchand balun. The DC power consumption of the SHM is only 22.5 mW under normal mixer operation.

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