A four-input beam-forming downconverter for adaptive antennas

Yamaji, Takafumi; Kurose, Daisuke; Watanabe, Osamu; Obayashi, Shuichi; Itakura, Tetsuro

doi:10.1109/jssc.2003.817262

Cited by 16 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the first approach, only one phase is generated in the oscillator core (two phases considering differential signals). Phase shifters, phase interpolators, or similar blocks follow the oscillator in order to generate multiple phases of its output signal in a continuous or discrete fashion [12], [15]. These blocks can be narrow-band around the LO frequency and their loss is usually not a major concern in the LO path.…”

Section: B Multiple Phase Generationmentioning

confidence: 99%

A 24-GHz SiGe phased-array receiver-LO phase-shifting approach

Hashemi

Guan

Komijani

et al. 2005

IEEE Trans. Microwave Theory Techn.

192

102

View full text Add to dashboard Cite

Abstract-A local-oscillator phase-shifting approach is introduced to implement a fully integrated 24-GHz phased-array receiver using an SiGe technology. Sixteen phases of the local oscillator are generated in one oscillator core, resulting in a raw beam-forming accuracy of 4 bits. These phases are distributed to all eight receiving paths of the array by a symmetric network. The appropriate phase for each path is selected using high-frequency analog multiplexers. The raw beam-steering resolution of the array is better than 10 for a forward-looking angle, while the array spatial selectivity, without any amplitude correction, is better than 20 dB. The overall gain of the array is 61 dB, while the array improves the input signal-to-noise ratio by 9 dB.

show abstract

Section: B Multiple Phase Generationmentioning

confidence: 99%

A 24-GHz SiGe phased-array receiver-LO phase-shifting approach

Hashemi

Guan

Komijani

et al. 2005

IEEE Trans. Microwave Theory Techn.

192

102

View full text Add to dashboard Cite

show abstract

“…Phase shifting instead of true time delay causes so called beam squinting (i.e. frequency dependent beam direction), but for narrow-band applications this effect can be neglected [11]. Apart from spatial filtering a phased-array system has a benefit of signal to noise ratio (SNR) improvement, compared to a single antenna receiver.…”

Section: Multi-antenna Phased-array Systemmentioning

confidence: 99%

A 4-Element Phased-Array System With Simultaneous Spatial- and Frequency-Domain Filtering at the Antenna Inputs

Ghaffari

Klumperink

Vliet

et al. 2014

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

-To reject strong interference in excess of 0 dBm, a 4-element LO-phase shifting phased-array receiver with 8-phase passive mixers terminated by baseband capacitors is presented. The passive mixers up-convert both the spatial and frequency domain filtering from baseband to RF, hence realizing blocker suppression directly at the antenna inputs. A comprehensive mathematical model provides a set of closed-form equations describing the spatial and frequency domain filtering including imperfections. A prototype is realized in 28 nm CMOS. It exploits 3 rd harmonic reception to achieve a wide RF-frequency range from 0.6-4.5 GHz at 34-119 mW power dissipation, while also providing impedance matching. Out of the band/beam, a 1 dB-compression point as high as +12/+10 dBm has been measured. The 1-element NF over the RF-frequency range is 4-6.3 dB, while in-beam/band IIP3 values of 0..+2.6 dBm are measured. This proposed technique can be instrumental to make RF receivers more robust for interference, while still being flexibly tunable in frequency.

show abstract

“…The ideal solution should provide a linear control of the phase over the entire 360 degrees range without affecting the amplitude of the signal. There are several methods to change the phase of a signal-a reflective type phase shifter utilizing a transmission line with controlled termination [3], high pass low pass cascaded filter elements, an all pass bridge [5], a vector modulator [2], [6]. In general it is difficult to provide a proper reactive termination control for a transmission line, so that there is linear control of the reflection coefficient.…”

Section: Circuit Designmentioning

confidence: 99%