This paper reports on a fully-integrated CMOS switchable directconversion receiver for 2GHz and 5GHz. Switchable low noise amplifier is proposed for suiting for multiband (2GHz, 5GHz). Sub-harmonic mixing is used for down-conversion to minimize the DC-offset due to LO-leakage. The residual DC-offset is cancelled by a digital-to-analog converter at the output of mixer. For quadrature down-conver...

A prototype design of a 2.7–3.3-V 14.5-mA SiGe direct-conversion receiver IC for use in third-generation wide-band code-division multiple-access (3G WCDMA) mobile cellular systems has been completed and measured. The design includes a bypassable low-noise amplifier (LNA), a quadrature downconverter, a local-oscillator frequency divider and quadrature generator, and variable-gain baseband amplif...

Delivering high gain, low noise and good linearity simultaneously with low power consumption in fully-integrated CMOS low noise amplifiers (LNAs) has posed significant difficulty. This paper presents a 19 dB gain, 2.4 dB noise figure, common-gate common-source (CG-CS) single-ended LNA operating at 5.4 GHz. Using gm-boosting, current-reuse and transformer feedback techniques, the LNA mitigates s...

A CMOS quadrature down-converter for a direct-conversion receiver of 5.15-5.825GHz wireless LAN is described. The down-converter consists of two sub-harmonic mixers, for I and Q channels, and an LO generation network. In order to prevent the low-frequency component generated by the even-order distortion of the transconductance stage from being leaked to the mixer output, transconductance and sw...

This paper presents a high‐conversion gain, low‐power, folded CMOS mixer for ZigBee application in 2.4 GHz of user bandwidth. The proposed mixer adapts current reuse technique to increase the conversion gain while substantially reducing the DC power dissipation. The current from LO stage is reused at the transconductance stage to reduce the power consumption. This mixer is verified in 0.13 μm s...

We present a design of broadband and wide dynamic range low noise amplifier/radio frequency variable gain amplifier (LNA/RF VGA) for digital video broadcasting – satellite (DVBS2) receiver tuner integrated circuit fabricated using the 0.18 μm complementary metal oxide semiconductor (CMOS) process. The MOS switching filter was used to get broadband characteristics of the LNA circuit and the MOS ...

A DC-offset cancellation scheme in the 5GHz directconversion receiver compliant with IEEE 802.11a wireless LAN standard is described in this paper. It uses the analog R~F4~~ i"a I oU feedback loop to eliminate the DC-offset at the output of the double-balanced mixer. The mixer has a simulation voltageA conversion gain of 13dB at 5.2GHz, noise figure of 9.67dB, -. 1) IIP3 of 7.6dBm. The solution...

Wireless medical body-area networks are used to connect sensor nodes that monitor vital parameters. The radio consumes a large portion of the sensor energy budget, and hence its power dissipation should be minimized. The low-noise amplifier (LNA) is an important component of the receiver, and must guarantee low-noise amplification and impedance matching. In this work, an ultra-low-voltage ultra...

This journal presents an ultra-low-voltage current bleeding mixer with high LO-RF port-to-port isolation, implemented on 0.13 μm standard CMOS technology for ZigBee application. The architecture compliments a modified current bleeding topology, consisting of NMOS-based current bleeding transistor, PMOS-based switching stage, and integrated inductors achieving low-voltage operation and high LO-R...

This brief presents the design of an improved linear Gilbert mixer with high conversion gain and low noise figure by using multiple gated transistor (MGTR) and switched biasing technique. This mixer operates at a radio frequency (RF) of 2.4GHz with a local oscillator (LO) power of 5dBm in UMC 180nm process. The MGTR method is used to increase the linearity of the proposed mixer by the parallel ...