Resistance calibration method without external precision elements

A method of resistance calibration without external precision elements usage presented in paper. In the proposed method, used structures which operation based on technologically accurate elements and signals to have high accuracy resistance after calibration. Architecture produces a calibration code corresponding to 50Ohms PVT compensated termination impedance, which is needed to avoid reflections in transmission lines. Standard calibration methods using external ~1% accuracy precision discreet resistance (50 or 200Ohms). The presented calibration mechanism using internal elements and can provide ~ 4-7% accuracy of calibration. Method can be used in the special input/output circuits of several standards such as Peripheral Component Interconnect (PCI), Universal Serial Bus (USB), Double Data Rate (DDR) etc.

[1]  Adolfo Steiger-Garção,et al.  Switched-capacitor circuits using a single-phase scheme , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[2]  Anurag Mittal,et al.  Mixed‐Signal Circuit Design , 2005 .

[3]  Abraham Balabanyan,et al.  Receiver/transmitter input/output termination resistance calibration method , 2013, 2013 IEEE XXXIII International Scientific Conference Electronics and Nanotechnology (ELNANO).

[4]  R. Torres-Torres,et al.  An approach for quantifying the conductor and dielectric losses in PCB transmission lines , 2009, 2009 IEEE 18th Conference on Electrical Performance of Electronic Packaging and Systems.