Abstract
This paper presents research on a low power CMOS UWB LNA based on a cascoded common source and current-reused topology. A systematic approach for the design procedure from narrow band to UWB is developed and discussed in detail. The power reduction can be achieved by using body biased technique and current-reused topology. The optimum width of the major transistor device M1 is determined by the power-constraint noise optimization with inner parasitic capacitance between the gate and source terminal. The derivation of the signal amplification S21 by high frequency small signal model is displayed in the paper. The optimum design of the complete circuit was studied in a step by step analysis. The measurements results show that the proposed circuit has superior S11, gain, noise figure, and power consumption. From the measured results, S11 is lower than -12 dB, S22 is lower than -10 dB and forward gain S21 has an average value with 12 dB. The noise figure is from 4 to 5.7 dB within the whole band. The total power consumption of the proposed circuit including the output buffer is 4.6 mW with a supply voltage of 1 V. This work is implemented in a standard TSMC 0.18 μm CMOS process technology.
Highlights
Ultra wide band (UWB) systems are a new wireless technology capable of transmitting data over a wide spectrum of frequency bands with very low power and high data rates
Based on the effect of the body-biased technique and the current reused cascode structure, the low power consumption of our work can achieve lower than 5 mW including the output buffer
The first stage consists of the LC input matching network, body biased technique, and the cascode common source amplifiers M1 and M2 using the current-reused technique for low power design
Summary
Ultra wide band (UWB) systems are a new wireless technology capable of transmitting data over a wide spectrum of frequency bands with very low power and high data rates. Some papers reporting on the common-gate amplifier have been suggested using wideband input matching as a solution by setting the input-transistor transconductance gm equal to the reciprocal of the source resistance [16]-[21]. For this topology, high value of the transconductance contrasts with low-current dissipation. The proposed circuit of a common-source amplifier with low power UWB LNA has been demonstrated [28]. Based on the effect of the body-biased technique and the current reused cascode structure, the low power consumption of our work can achieve lower than 5 mW including the output buffer.
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