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In this paper we propose a variable-gain transimpedance amplifier suitable for low-power applications. Its noise, bandwidth and input impedance performance are similar to a more conventional regulated-cascode common-gate transimpedance with resistive load, with the same power consumption and gain performance. The proposed amplifier has, however, variable gain, which can be easily changed by setting...
This paper proposes the design and analysis of a broadband 2-40 GHz passive distributed drain-pumped mixer using 0.18 μm CMOS technology for ultrawide-band (UWB) receivers. To achieve broad bandwidth for the UWB communications, a distributed topology is introduced. A closed-form analytical model for the conversion loss of distributed drain-pumped mixer is presented for the first time. The designed...
A 1.1 mW 87 dB dynamic range 3rd order ΔΣ modulator is implemented in 0.18 μm CMOS technology for the audio applications. By adopting a feed-forward multi-bit topology, the signal swing at the output of the first integrator can be suppressed and only one simple current mirror single-stage OTA with 34 dB DC gain is used in the first integrator. The prototype modulator achieves 87 dB DR and 83.8 dB...
A low power inductorless variable gain amplifier (VGA) for wideband communication systems is presented in this paper. It is a resistor feedback close-loop amplifier based on a proposed wideband operational amplifier. The operational amplifier is constructed by an artificially differential N/P complementary cascode amplifying stage for high gain, and a self-biased N/P complementary source follower...
A detailed comparison of integrated CMOS charge amplifiers is presented in this work. Conventional topologies, along with new ones, have been fabricated in a CMOS test chip prototype and their measured performance compared in terms of sensitivity, PSRR, and frequency response. As a result of this work, a complete library of fabricated CMOS charge amplifiers is presented and the performance tradeoffs...
This paper describes theoretical as well as practical aspects in designing low phase noise LC CMOS oscillators. It starts with an overview of the different oscillator performance parameters found in a typical oscillator specification sheet. It also describes the LC-tank oscillation phenomena by analyzing a simplified LC oscillator circuit. Oscillator phase noise analysis is then introduced as a logical...
An optimum gate-loaded cascode topology for maximizing the gain of a stable CMOS amplifier in micro/millimeter wave band is presented. By adding a piece of transmission line in the gate of cascode transistor, choosing an appropriate matching circuit that includes biasing, and exploiting the proper transmission line structure the gain per stage of CMOS amplifier can be increased and an optimum design...
A low-power ultra-compact CMOS low-noise amplifier (LNA) in a shunt-resonating current-reused topology is presented. The common-source transistors are connected with a shunt-resonating inter-stage match network such that the bias current is shared to have low power consumption and RF signal is doubly amplified to have high gain and low noise figure. The implemented 0.18 mum CMOS LNA achieves 15.2...
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