| 1. |
- Abbasi, Morteza, 1982, et al.
(författare)
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A 80-95 GHz direct quadrature modulator in SiGe technology
- 2014
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Ingår i: SiRF 2014 - 2014 IEEE 14th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems. - 9781479915231 ; , s. 56-58
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Konferensbidrag (refereegranskat)abstract
- A direct carrier IQ modulator operating in the 80-95 GHz frequency range is presented. The circuit is designed and fabricated in 0.18μm SiGe technology with 170/250 GHz fT/fmax. The modulator is based on double-balanced gilbert mixer cells with on-chip quadrature LO phase shifter and consumes 23mW DC power. In single-sideband operation, the chip exhibits up to 3 dB conversion gain below 85 GHz and -1± 0.5 dB up to 95 GHz. The image rejection ratio and LO-RF isolation are as high as 25 dB and 43 dB respectively. The modulator can operate with 10 GHz of modulation bandwidth and delivers -7 dBm power in saturation. For demonstration, the circuit is tested and shown to be capable of transmitting 4Gbps BPSK signal with NRZ rectangular pulses. The active chip area is 480μm× 260μm. © 2014 IEEE.
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| 2. |
- Abbasi, Morteza, 1982, et al.
(författare)
-
A Broadband 60-to-120 GHz single-chip MMIC multiplier chain
- 2009
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Ingår i: IEEE MTT-S International Microwave Symposium Digest. - 0149-645X. ; , s. 441-444
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Konferensbidrag (refereegranskat)abstract
- This paper presents a single-chip 60 GHz to 120 GHz frequency multiplier chain based on 0.1 ?m GaAs mHEMT. The MMIC can deliver 3 to 5 dBm of output power from 110 GHz to 130 GHz with 2 dBm input power and consumes only 65 mW of DC power. The signal at the fundamental frequency is suppressed more than 20 dB over the band of interest. The impedance matching networks are realized using coupled transmission lines.
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| 3. |
- Abbasi, Morteza, 1982, et al.
(författare)
-
A broadband differential cascode power amplifier in 45 nm CMOS for high-speed 60 GHz system-on-chip
- 2010
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Ingår i: 2010 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2010; Anaheim, CA; 23 May 2010 through 25 May 2010. - 1529-2517. ; , s. 978-142446242-1-
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Konferensbidrag (refereegranskat)abstract
- A compact two-stage differential cascode power amplifier is designed and fabricated in 45 nm standard LP CMOS. The cascode configuration, with the common gate device placed in a separate P-well, provides reliable operating condition for the devices. The amplifier shows 20 dB small-signal gain centered at 60 GHz with a flat frequency response and 1-dB bandwidth of 10 GHz. The broadband large-signal operation is also ensured by providing constant load resistance to both stages over the entire band and coupling them with a dual resonance matching network. The chip delivers 11.2 dBm output power at 1-dB compression and up to 14.5 dBm power in saturation. The power amplifier operates with 2 V supply and draws 90 mA total current which results in 14.4% maximum PAE. The output third order intercept point is measured to be 18 dBm for two-tone measurement at 60 GHz with 0.5 GHz, 1 GHz and 2 GHz frequency separations. © 2010 IEEE.
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| 4. |
- Abbasi, Morteza, 1982, et al.
(författare)
-
A direct conversion quadrature transmitter with digital interface in 45 nm CMOS for high-speed 60 GHz communications
- 2011
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Ingår i: Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium. Baltimore, 5-7 June 2011. - 1529-2517. - 9781424482931
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Konferensbidrag (refereegranskat)abstract
- A compact 60 GHz direct conversion quadrature transmitter is designed and fabricated in 45 nm standard LP CMOS. The transmitter features an integrated power amplifier with continuous output level control and interfaces binary data signals with nominal peak-to-peak voltage swing of 300 mV. The highest measured modulation bandwidth is limited by the measurement setup to 4 GHz but is simulated to be as high as 10 GHz. In single sideband up-converting operation mode, the measured image suppression ratio is 22 dB with 36 dB of carrier suppression corresponding to approximately 8% EVM in the output signal constellation. The output RF frequency can be from 54 GHz to 66 GHz to accommodate several channels and the output power can be adjusted from -3 dBm to 10 dBm. The chip is operated from a 2 V supply and draws 180 mA current.
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| 5. |
- Abbasi, Morteza, 1982, et al.
(författare)
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An E-Band(71-76, 81-86 GHz) Balanced Frequency Tripler for High-Speed Communications
- 2009
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Ingår i: APMC: 2009 ASIA PACIFIC MICROWAVE CONFERENCE. - 9781424428014 ; 1-5, s. 1184-1187
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- An E-Band transistor-based balanced frequency tripler is implemented using a 0.15 mu m GaAs mHEMT process which can be integrated into a single-chip RF front-end. The balanced configuration with 90 degrees hybrids at the input and output improves the port impedance matching which is measured to be better than 15 dB at the input and 10 dB at the output over the frequencies of interest. The tripler has a conversion loss of 11.5 dB from 71 GHz to 76 GHz and 14 dB from 81 GHz to 86 GHz. The second and forth harmonics are suppressed by more than 30 dB and the fundamental frequency by 20 dB. The tripler can deliver -2 dBm output power.
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| 6. |
- Abbasi, Morteza, 1982, et al.
(författare)
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Direct carrier quadrature modulator and Demodulator MMICs for 60 GHz gigabit wireless communications
- 2011
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Ingår i: Asia-Pacific Microwave Conference Proceedings (APMC 2011; Melbourne, VIC; 5 - 8 December 2011). - 9780858259744 ; , s. 1134-1137
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A 60 GHz direct carrier quadrature modulator is designed and fabricated in 0.15 μm mHEMT technology. The design is based on passive mixers and therefore reciprocal which makes it possible to be used both as modulator and demodulator. The modulator has an input bandwidth of 0-5 GHz on each of the I and Q ports and an RF bandwidth of 53-68 GHz. Carrier leakage to the output port is eliminated by addition of an inductive path from the LO port to the RF port. The modulator requires 5 dBm LO power and can output up to -6 dBm RF power in linear region and up to -4 dBm when driven into saturation. When operated as an SSB mixer, the conversion loss is measured to be 11 dB and image and LO signals are suppressed by as much as 30 dB compared to the desired signal. For demonstration, a pair of the presented modulator/demodulator is used to transmit 7Gbps BPSK signal over 1m and 10Gbps QPSK signal over 0.5m wireless link.
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| 7. |
- An, Sining, 1991, et al.
(författare)
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A 40 Gbps DQPSK Modem for Millimeter-wave Communications
- 2016
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Ingår i: Asia-Pacific Microwave Conference Proceedings APMC 2015. ; 1
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Konferensbidrag (refereegranskat)abstract
- A high speed differential quadrature phase shift keying (DQPSK) modulator and demodulator (modem) is presented for data rates up to 40 Gbps, in which the modulator is based on an FPGA and the demodulator is based on analog components. The modem performance has been verified in a lab environment. The targeted application is wireless communications using millimeter-wave bands as a flexible alternative to optical fiber links in next generation mobile networks.
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| 8. |
- An, Sining, 1991, et al.
(författare)
-
An 8 Gbps E-band QAM Transmitter Using Symbol-based Outphasing Power Combining Technique
- 2017
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Ingår i: Radio-Frequency Integration Technology (RFIT2017). - 9781509040360 ; , s. 150-152
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Konferensbidrag (refereegranskat)abstract
- In millimeter-wave communication systems, generating high output power with high efficiency on the transmitter side is one major challenge. In this paper, a symbol-based outphasing power combining solution has been demonstrated with data rate up to 8 Gbps at an RF frequency of 83.5 GHz. This solution provides 2 dB higher output power compared to the power of two QAM signals at 12% EVM.
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