[Show abstract][Hide abstract] ABSTRACT: This paper describes a 2.4 GHz single-ended switched gain low noise amplifier (SG-LNA) in a 0.35 mum SiGe BiCMOS process. In the design, specific architecture decisions were made in consideration of system-on-chip implementation. The architecture profits from a two cascode stage topology with a shunt resistive feedback in the first cascade-topology stage. The SG-LNA achieved a maximum small signal gain of 34.3 dB within input 1-dB compression point (ICP1dB) of -22 dBm in high-gain mode (HGM), a gain of 25.4 dB within ICP<sub>1dB</sub> of -13.8 dBm in medium-gain mode (MGM) , and a minimum gain of 18.3 dB within ICP<sub>1dB</sub> of -6.8 dBm in low-gain mode (LGM). The noise figures (NF) are 2.9 dB, 5.5 dB and 5.9 dB in HGM, MGM and LGM, respectively. Because of using a Common-Gate topology as an active input matching, the SG-LNA presented a good input and output return losses in all modes. All biases applied are active. The SG-LNA consumes a maximum DC current of 42 mA from a 3.3 volt DC supply.
Advances in Electronics and Micro-electronics, 2008. ENICS '08. International Conference on; 11/2008
[Show abstract][Hide abstract] ABSTRACT: A 2.4GHz front-end system design for wide spectrum WLAN applications is presented in a 0.35 μm SiGe BiCMOS Technology. This transceiver front-end contains a receive (Rx) chain with a two-stage cascode low noise amplifier (LNA) and an active down-conversion Rx mixer, and a transmit (Tx) chain composed of a Gilbert-Cell core up-conversion Tx mixer and a high-gain Driver Amplifier (DA). The high linear LNA shows a gain of 15.5 dB, an noise figure (NF) of 2.28 dB and an input- referred third-order intercept point (IP3) of +2.4 dBm with 1-dB gain bandwidth (BW) of 1.5 GHz. The single-balanced Rx mixer exhibited a gain and 1-dB gain BW of +6.8 dB and 1.5 GHz. Also a double-balanced Tx mixer with a gain and input/output return loss of -1.3dB and below -35dB, respectively, and a DA with a gain and output-referred IP3 of +29.2dB and +21.2dBm, respectively, is developed. The NF, input-referred IP3 and DC power consumption of Rx string (from antenna to Rx mixer) were achieved 4.4 dB, -15.4 dBm and 30 mW respectively. The output-referred IP3 and power consumption of Tx chain were +20.5 dBm and 125 mW, respectively.
Information and Communication Technologies: From Theory to Applications, 2008. ICTTA 2008. 3rd International Conference on; 05/2008
[Show abstract][Hide abstract] ABSTRACT: This paper describes a low voltage low noise amplifier (LNA), designed using 0.35¿m SiGe BiCMOS process, targeting a center frequency of 5.8GHz with a voltage supply 1.2V. A power gain of 12.1dB at 5.8GHz has been achieved with a low power consumption of 3.8mW, including all biasing circuitry. The overall noise figure of the LNA is 3dB with both input and output impedance matched to 50¿.
[Show abstract][Hide abstract] ABSTRACT: The principle of recursive filters is well known in digital filtering. This paper deals with active recursive filters. A new design approach is presented. It will be shown that how active elements can be used in the design of amplification elements and large microwave time delay. The analytical and computer-simulated results will be presented for an active bandpass filter in the C-band.
Proceedings of the 4th WSEAS International Conference on Electronics, Hardware, Wireless and Optical Communications; 02/2005
[Show abstract][Hide abstract] ABSTRACT: An original method to increase the tuning range of a
monolithic-microwave integrated-circuit (MMIC) varactor diode is
presented in this paper. An active circuit simulating a negative
capacitance is connected to the varactor diode. This method allows to
increase the varactor's tuning range more than ten times and to
compensate its series resistance at the same time. A MMIC simulating a
negative capacitance have been successfully fabricated and measured. To
the best of the authors' knowledge, this is the first realization of a
MMIC simulating a negative capacitance
IEEE Transactions on Microwave Theory and Techniques 01/2002; · 2.94 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Active filtering has been an area of interest for several years.
Well-stabilised commercial MMIC processes with reasonable costs now
exist (with multichip projects). The authors report the design of a
narrowband active MMIC bandpass filter centred about 4 GHz
[Show abstract][Hide abstract] ABSTRACT: This paper presents the simulation and measurement results of a broadband MMIC amplifier. This amplifier differs from usual broadband MMIC amplifiers such as resistive matching and those distributed. Its topology is based on the use of active matching and active biasing.
[Show abstract][Hide abstract] ABSTRACT: We studied even-mode rejection of FET differential structures. The coupling admittance appears as the essential factor. We have analysed both passive and active coupling admittances. An accurate choice of the latter allowed rejection enhancement. From these theoretical results a MMIC structure has been designed.
[Show abstract][Hide abstract] ABSTRACT: The measurement of S parameters with a network analyser is affected by both systematic and random errors. Several error models exist for systematic errors. A similar model is proposed to evaluate the random errors which affect the measured values of S parameters when systematic errors have been extracted. This error model is independent of the measured DUT and characterises only the sensitivity of a given calibration procedure to random error. A simulation on a TRL calibration is shown as an example.
[Show abstract][Hide abstract] ABSTRACT: This paper describes a novel and simple method of compensation for resistive mixers conversion losses. We show that a negative conductance can be used to optimize the resistive mixers conversion losses. Finally, we present the design and the simulation of an optimized simple MMIC resistive mixer with 0 dB conversion loss.