This paper presents the design of a dual-band L1/L2 Global Positioning System (GPS) receiver. A low-IF architecture was used for dual-band operation with analog onchip image rejection. The receiver is composed of dual-band LNAs and down-conversion mixers, a complex variable-gain channel select filter, analog AGC loop, and a 2-bit analog-todigital converter. The receiver is to be integrated with a phaselocked-loop synthesizer designed in another work [1]. The digital tracking correlator of the receiver is designed and implemented on FPGA. The acquistion part of the digital receiver is still under development using embedded software. The digital correlator showed successful operation with a signal of -30dB SNR at the A/D output. Designed in a 0.13 µm CMOS technology, the receiver exhibits maximum gain of 112 and 115 dB, noise figures of 4.3 dB and 3.6 dB, and Input Compression Points of -75 dBm and -78 dBm for L1 and L2 bands, respectively. The complex variable-gain channel select filter provides image rejection better than 25 dB and gain control range over 60 dB. The receiver consumes 12 mW from a 1.2-V supply.

This paper presents the system level design of a X 7 frequency synthesizer for dual band GPS receivers that can be easily integrated in wireless phones (mainly GSM mobile IF Signal Digital Data phones). For the ease of integration with GSM wireless systems Tracking the synthesizer can tolerate most of the common GSM crystals, Loops besides the GPS crystals. T T The presented synthesizer was designed to target a low LO Signal Digitak IF down conversion receiver with a tolerable IF range of RF 10% around 4.092MHz which allows the use of the famous Syntheiizer 10/13/26MHz GSM crystals and all the GPS crystals. The designed frequency synthesizer generates the LO signals for both L1/L2 bands (1.5713GHz/1.2317GHz) with an average Fig. 1. Basic GPS System Components phase noise of -95dBc/Hz,consuming 4.05mW/4.5mW for L1IL2 respectively at 1.2V supply.The GPS receiver system, consists of three main parts:RF

This paper presents the design of a dual-band L1/L2 GPS receiver, that can be easily integrated in portable devices (mainly GSM mobile phones). For the ease of integration with GSM wireless systems the receiver can tolerate most of the common GSM crystals, besides the GPS crystals, this will eliminate the need to use another crystal on board. A new frequency plan is presented to satisfy this requirement. A low-IF receiver architecture is used for dual-band operation with analog on-chip image rejection. The receiver is composed of a narrow-band LNA for each band, dual down-conversion mixers, a variablegain channel filter, a 2-bit analog-to-digital converter, and a fully integrated frequency synthesizer including an on-chip VCO and loop filter. The complex filter can accept IF frequency variation of 10% around 4.092 MHz which allows the use of the commonly used 10/13/26 MHz GSM crystals and all the GPS crystals. The synthesizer generates the LO signals for both L1/L2 bands with an average phase noise of -95 dBc/Hz. The receiver exhibits maximum gain of 112 and 115 dB, noise figures of 4 and 3.6 dB, and input compression points of -76 and -79 dBm for L1 and L2, respectively. An on-chip variable-gain channel filter provides IF image rejection greater than 25 dB and gain control range over 80 dB. The receiver is designed in 0.13 lm CMOS technology and consumes 18 mW from a 1.2-V supply.