Quadrature Sampling Mixer Topology for SAW-Less GPS Receivers in 0.18μm CMOS
نویسندگان
چکیده
Abstract This paper describes a new switching topology of a sampling mixer for SAW-less GPS (L1 band) receivers. The GPS receiver with the new mixer achieved NF 2.5dB and good blocking performance. In an alternative implementation, the mixer is stacked under a Quadrature VCO to reuse supply current. As a result, the current consumption of the GPS receiver is 11mA from 1.8V supply while maintaining blocking performance and NF of 3.5dB. Test chips are fabricated in 0.18μm CMOS process.
منابع مشابه
A 5.25ghz Monolithic Image-rejection Mixer
This paper describes the implementation of the image rejection mixer block in the 5GHz frequency band using 0.18μm CMOS technology. The image rejection mixer block adopts the double-quadrature topology for high image-rejection ratio in the high frequency applications and is designed for the dual-conversion receiver. The loss of the polyphase filter in the signal path can be reduced with simple ...
متن کاملDiscrete-Time Receivers for Software-Defined Radio: Challenges and Solutions
CMOS radio receiver architectures, based on radio frequency (RF) sampling followed by discrete-time (DT) signal processing via switched-capacitor circuits, have recently been proposed for dedicated radio standards. This paper explores the suitability of such DT receivers for highly flexible softwaredefined radio (SDR) receivers. Via symbolic analysis and simulations we analyze the properties of...
متن کاملA Wideband Cmos Current-mode Down- Conversion Mixer for Multi-standard Receivers
This paper presents a low voltage wideband downconversion mixer using current-mode approach for multi-standard receivers. The proposed mixer uses a current mirror amplifier with an embedded passive switching core to achieve mixing function, which can combine the advantages of active and passive mixers simultaneously. The mixer is implemented using a 0.18μm CMOS technology and covers frequency b...
متن کاملCMOS Front-End Circuits of Dual-Band GPS Receiver
A RF front-end chip for a dual-band Global Positioning System (GPS) receiver for L1 and L2 bands is designed using 0.25 μm CMOS technology. All function blocks of the GPS front-end are integrated onto one chip. The low noise amplifier has input matching over a wide frequency range to handle the L1 and L2 bands. This receiver uses a dualband image-reject mixer with the quadrature mixer sharing a...
متن کاملInfluence of timing jitter on quadrature charge sampling
The influence of timing jitter on quadrature charge sampling for a direct conversion receiver has been evaluated. In contrast to voltage sampling, the charge sampling mixer integrates the signal current instead of tracking the signal voltage. The charge sampling mixer has been applied to RF direct sampling in wireless receivers. The influence of timing jitter on charge sampling has been analyse...
متن کامل