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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Griffith, Z. Urteaga, M. Rodwell, M.J.W. |
| Copyright Year | 2008 |
| Description | Author affiliation: Teledyne Sci. & Imaging Co., Thousand Oaks, CA (Urteaga, M.) || Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA (Griffith, Z.; Rodwell, M.J.W.) |
| Abstract | We here report mm-wave amplifiers employing strong global negative feedback to provide very low intermodulation distortion, using an InP DHBT technology. The amplifiers, similar to operational amplifiers, use simple- or nested-Miller compensation and have 25 to 40 GHz feedback loop bandwidths. The large loop transmission at 2 GHz provides a large reduction of closed-loop distortion at this frequency. A simple-compensated amplifier with 24.8 GHz bandwidth and having 1013 mW dissipation showed 13.8 dB $(S_{21})$ gain and 50.2 dBm OIP3 at (1.950, 1.975 GHz). It is unconditionally stable from DC to 15 GHz, and stable in a 50 Omega system from DC to 50 GHz. A nested-compensated amplifier with 40 GHz bandwidth and having 993 mW dissipation showed 13.8 dB $(S_{21})$ gain and 42.8 dBm OIP3 at (1.950, 1.975 GHz). It is unconditionally stable from DC-20 GHz and stable in a 50 Omega system from DC to 50 GHz. These results represent $_{~}$ 4times increase in bandwidth for an op-amp of any kind, as well as $_{~}$ 3times betterment in $OIP3/P_{DC}$ ratio at $f_{s}$ = 2-3 GHz, when compared to state-of-the-art. We address considerations important to the application of negative feedback to mm-, microwave amplifiers, including the effects of interface impedances on stability, the effect of feedback upon return losses and noise figure, and the effect of frequency compensation and of feedback topology on closed-loop distortion. |
| Starting Page | 1 |
| Ending Page | 4 |
| File Size | 3504458 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424422586 |
| ISSN | 10928669 |
| DOI | 10.1109/ICIPRM.2008.4703038 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-05-25 |
| Publisher Place | France |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Operational amplifiers Negative feedback Bandwidth Intermodulation distortion Frequency Negative feedback loops Indium phosphide Feedback loop Microwave amplifiers Impedance |
| Content Type | Text |
| Resource Type | Article |
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