A simple smart composite using fiber Bragg grating sensors for strain and temperature discrimination

Autor: Orlando Frazão, R. Oliveira, Ireneu Dias
Rok vydání: 2008
Předmět:
Zdroj: Microwave and Optical Technology Letters. 51:235-239
ISSN: 0895-2477
DOI: 10.1002/mop.23990
Popis: 3. MEASUREMENT RESULTS The designed mixer was measured by bare chip probing and coaxial cable connection. The RF and LO ports are contacted with GSG probes of 100 m pitch. The IF port is connected to a SMA connector through bonding wires and FR-4 substrate. The measured conversion gain of mixer is between 1 and 3.4 dB at the RF frequency from 23 to 25.1 GHz and the fixed LO frequency of 24.1 GHz with LO power of 0 dBm as shown in Figure 3. The 3-dB bandwidth obtains 1.9 GHz at RF signal from 23.1 to 25 GHz. Figure 4 shows the measured return loss for RF and LO ports. The RF and LO return losses show less than 15 dB and 7d B at the frequency of 20 –26.5 GHz, respectively. These wideband characteristics are similar to the balun. The measured isolation performance is shown in Figure 5. The RF to LO and LO to RF isolations achieve less than 40 dB at 20 –26.5 GHz. Figure 6 shows the input 1 dB compression point (input P1dB), which is 4 dBm. The comparison of the designed mixer with the one in [5], [7], and [8] is shown in Table 1. 4. CONCLUSION The K-band double balanced mixer based on Gilbert-cell type in 0.18 m CMOS technology is presented. The proposed balun circuits are used for the matching network at the RF and LO ports of the mixer to increase bandwidth. The mixer achieves a 3-dB bandwidth of 1.9 GHz while dissipating the power of 36 mW at 1.8 V supply. This mixer may be applied to the short range automotive radar with a high range resolution of less than 10 cm.
Databáze: OpenAIRE
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