Research on V-band Quadrupler and K-band Tunable IQ Mixer with High Image Rejection Ratio
Date Issued
2011
Date
2011
Author(s)
Syu, Jhu-Rong
Abstract
Frequency multiplier is an important component in the wireless communication, because the high-frequency sources are difficult to achieve. Therefore, we usually use a low-frequency voltage control oscillator (VCO) cascading with a multiplier to realize the high frequency sources and it also has better phase noise. With the multiple number increases, the output power of the multiplier would decrease gradually because of high order harmonic term. Therefore, it is a big challenge to design a high order multiplier with high output power. In this thesis, a V-band quadrupler is designed and fabricated in the 90-nm 1P9M CMOS technology. The goal of this work is to design a quadrupler with good conversion gain, harmonic suppressions and good output power. Two doublers and a buffer amplifier are cascaded to realize a quadrupler, and three-dimensional spiral inductors are use in this design. The maximum conversion gain is 3 dB at 66 GHz, and 3-dB bandwidth is from 60-to-70 GHz. The maximum output power is 4 dBm at 65 GHz, and harmonic suppressions are all smaller than 30 dB.
To achieve good image rejection ratio, a quadrature generator with good phase and amplitude imbalances is very important for an image reject mixer. Unfortunately, the process variation is a big challenge for designing a high image rejection characteristic. In this thesis, a high image rejection mixer is designed and fabricated in the 0.18-um 1P6M CMOS technology. The conventional quadrature phase generator, poly-phase filter, is very sensitive to the process variation. To overcome process variation, a new quadrature phase generator with tunable resistors which can be adjusted by a control voltage to fine tune the phase and amplitude imbalances is proposed. The tunable resistor is implemented by a NMOS paralleled with an inductor to resonate the parasitic capacitor. A resistive mixer is designed to verify this mechanism of the proposed quadrature phase generator. This mixer demonstrates an image rejection ratio (IRR) of larger than 30 dB from 18.5 to 29 GHz, and the maximum IRR is 49.9 dB.
Subjects
IRR
mixer
quadrupler
Type
thesis
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