This paper presents a differential low power low noise amplifier designed for the wireless sensor network （WSN） in a TSMC 0.18μm RF CMOS process.A two-stage cross-coupling cascaded common-gate（CG） topology has been designed as the amplifier.The first stage is a capacitive cross-coupling topology.It can reduce the power and noise simultaneously.The second stage is a positive feedback cross-coupling topology,used to set up a negative resistance to enhance the equivalent Q factor of the inductor at the load to improve the gain of the LNA.A differential inductor has been designed as the load to achieve reasonable gain.This inductor has been simulated by the means of momentum electromagnetic simulation in ADS.A ＂double-π＂ circuit model has been built as the inductor model by iteration in ADS.The inductor has been fabricated separately to verify the model. The LNA has been fabricated and measured.The LNA works well centered at 2.44 GHz.The measured gain S_（21） is variable with high gain at 16.8 dB and low gain at 1 dB.The NF（noise figure） at high gain mode is 3.6 dB,the input referenced 1 dB compression point（IP1dB） is about -8 dBm and the IIP3 is 2 dBm at low gain mode.The LNA consumes about 1.2 mA current from 1.8 V power supply.
This paper presents a low noise amplifier（LNA）,which could work at an ultra-low voltage of 0.5 V and was optimized for WSN application using 0.13μm RF-CMOS technology.The circuit was analyzed and a new optimization method for a folded cascode LNA was introduced.Measured results of the proposed circuit demonstrated a power gain of 14.13 dB,consuming 3 mW DC power,showing 1.96 dB NF and an input 1-dB compression point of -19.9 dBm.Both input power matching（S_（11）） and output power matching（S_（22）） were below -10 dB.The results indicate that this LNA is fully applicable to low voltage and low power applications.
A 5-GHz CMOS programmable frequency divider whose modulus can be varied from 2403 to 2480 for 2.4-GHz ZigBee applications is presented.The divider based on a dual-modulus prescaler（DMP） and pulse-swallow counter is designed to reduce power consumption and chip area.Implemented in the 0.18-μm mixed-signal CMOS process,the divider operates over a wide range of 1-7.4 GHz with an input signal of 7.5 dBm;the programmable divider output phase noise is -125.3 dBc/Hz at an offset of 100 kHz.The core circuit without test buffer consumes 4.3 mA current from a 1.8 V power supply and occupies a chip area of approximately 0.015 mm^2.The experimental results indicate that the programmable divider works well for its application in frequency synthesizers.
A new high performance charge pump circuit is designed and realized in 0.18μm CMOS process. A wide input ranged rail-to-rail operational amplifier and self-biasing cascode current mirror are used to enable the charge pump current to be well matched in a wide output voltage range.Furthermore,a method of adding a precharging current source is proposed to increase the initial charge current,which will speed up the settling time of CPPLLs.Test results show that the current mismatching can be less than 0.4%in the output voltage range of 0.4 to 1.7 V,with a charge pump current of 100μA and a precharging current of 70μA.The average power consumption of the charge pump in the locked condition is around 0.9 mW under a 1.8 V supply voltage.
A 0.5 V static master-slave D flip-flop （DFF） divider-by-2 is implemented with a 0.13 μm 1P8M RF- mixed signal CMOS process. Low-threshold transistors in a deep-N well with forward-body bias technology are used in the circuit. Each of the D-latch with source coupled logic consists of sensing and latching circuits. To increase the maximum operating frequency and decrease power consumption, the latching current is one half of the sensing current. The circuit optimization methods are described in this paper. The measured maximum operating frequency is 6.5 GHz and the minimum input singled-signal amplitude is 0.15 V.
A Gm-C complex filter with on-chip automatic tuning for wireless sensor networks is designed and implemented using 0.18 μm CMOS process. This filter is synthesized from a low-pass 5th-order Chebyshev RLC ladder filter prototype by means of capacitors and fully balanced transconductors. A conventional phase-locked loop is used to realize the on-chip automatic tuning for both center frequency and bandwidth control. The filter is centered at 2 MHz with a bandwidth of 2.4 MHz. The measured results show that the filter provides more than 45 dB image rejection while the ripple in the pass-band is less than 1.2 dB. The complete filter including on-chip tuning circuit consumes 4.9 mA with 1.8 V single supply voltage.
This paper presents an up-conversion mixer for 2.4GHz wireless sensor networks in 0. 181xm RF complementary metal-oxide semiconductor （CMOS） technology. It is based on a double-balanced Gilbert cell type. With two Gilbert cells it was applied quadrature modulation. Operational ampli- tiers are used in this design to improve the conversion gain under low power consumption. The mixer design is based on 0.18txm RF CMOS process. And the mixer test results indicate that under 1.8V power supply, with input frequency 2.4 - 2.4835GHz, the conversion voltage gain is 1.2 - 2dB. When the output frequency is 2.4GHz, its power gain is -4.46dB, and its input referred 1 dB com- pression point is -11.5dBm and it consumes 1.77mA current.
