| 1. |
- Dixon, A., et al.
(författare)
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Digital self-aware charge pump calibration technique for frequency synthesizers
- 2009
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Ingår i: 2009 16th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2009. - : IEEE. - 9781424450916 ; , s. 743-746
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Konferensbidrag (refereegranskat)abstract
- As radio design complexity increases and features sizes decrease, more innovative solutions are explored to ensure analog circuit designs meet specifications. Digital calibration is an inexpensive and effective solution. A novel digital calibration technique to improve charge pump current mismatch in frequency synthesizers is presented. This method detect. The charge pump error by measurin. The low pass filter voltage oy the system forced to operate at a fixed phase error. A reference table developed from a mathematical model oy the system use. The measurement result to produce a digital control word. The digital control word acts on a charge pump array to correc. The error. The technique is implemented and tested in Matlab/Simulink for a case study frequency synthesizer. The calibration technique correct. The charge pump current absolute error to within 1.4% oy the nominal value. Additionally. The technique is exceptionally effective for correctin. The charge pump current mismatch to within 1%.
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| 2. |
- Rodriguez, Saul, et al.
(författare)
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ARCHER : an automated RF-IC Rx front-end circuit design tool
- 2009
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Ingår i: Analog Integrated Circuits and Signal Processing. - : Springer Science and Business Media LLC. - 0925-1030 .- 1573-1979. ; 58:3, s. 255-270
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a tool capable of automatically compiling the circuit of a direct-conversion receiver at the schematics level based on system specifications that include the frequency of operation, gain, noise figure, IIP2 and IIP3 linearity. The front-end of a direct-conversion receiver is built using inductive source degeneration (LSD) LNA and double-balanced source-degenerated Gilbert Cell mixers with charge injection. The tool uses power constrained noise and linearity optimization vector-space algorithms that automatically size the transistors, passive components, and find the optimum biasing points. The solution generated by the tool is automatically read by Agilent ADS where the blocks are easily fine-tuned and validated before layout. Case studies involving WiMAX, UMTS, GSM, Bluetooth and WLAN are presented to reveal the capabilities of the tool in reducing the design time.
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