Title :
A 4-dB NF GPS receiver front-end with AGC and 2-b A/D
Author :
Cloutier, Mark ; Varelas, Theodore ; Cojocaru, Christian ; Balteanu, Florinel
Author_Institution :
Philsar Electron. Inc., Ottawa, Ont., Canada
Abstract :
A dual-IF GPS receiver front-end integrates all the active circuitry to down-convert, amplify and digitize the 1,575.42 GHz L1 signal. The chip includes 3 dB NF LNA, 38 dB image reject mixer, VCO with integrated LC tank and varactor, PLL synthesizer, 55-dB range AGC with charge-pump control, 2-b A/D, crystal oscillator and TTL-compatible buffers. The receiver noise figure is 4 dB and maximum gain is 120 dB with a power consumption of 49 mA at 3 V supply. The AGC and 2-b A/D offer better SNR and significantly better blocking performance than the commonly used 1-b quantizers
Keywords :
Global Positioning System; analogue-digital conversion; automatic gain control; bipolar integrated circuits; radio receivers; 120 dB; 1572.42 GHz; 25 GHz; 3 V; 4 dB; 49 mA; A/D; AGC; LNA; NF GPS receiver front-end; PLL synthesizer; TQFP; TTL-compatible buffers; VCO; active circuitry; blocking performance; charge-pump control; crystal oscillator; image reject mixer; integrated LC tank; power consumption; receiver noise figure; varactor; Charge pumps; Circuits; Gain; Global Positioning System; Noise figure; Noise measurement; Phase locked loops; Synthesizers; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Custom Integrated Circuits, 1999. Proceedings of the IEEE 1999
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-5443-5
DOI :
10.1109/CICC.1999.777274
