Analog Integrated Polyphase Filters

  • Michiel Steyaert
  • Jan Crols


When it comes to integratability, the zero-IF receiver is an alternative for the heterodyne or IF receiver. In recent years it has been introduced in several applications, but its performance can not be compared to that of the IF receiver yet. In this paper the principle of the low-IF receiver is introduced. The low-IF receiver has a topology which is closely related to the zero-IF receiver. Like the zero-IF receiver, the implementation of a low-IF receiver can be done with a high degree of integration. Its performance can however be better. The low-IF receiver is not sensitive to DC-offsets or LO to RF crosstalk. The principle of the low-IF receiver is based on the replacement of the LF lowpass filter of a zero-IF receiver with an analog integrated active polyphase filter. An active polyphase filter can perform a lowpass filter operation shifted on to a center frequency. In this paper the realization of a 5th order lowpass Butterworth filter centered around a low IF of 250 kHz is presented. This polyphase filter is designed for a low-IF receiver for high quality applications. The filter is implemented with the active-RC technique in a standard 1.2 μm CMOS process.


Lowpass Filter Mirror Suppression Positive Frequency Negative Frequency Switchable Capacitor 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    “Direct-conversion FM design,” Electronics World, pp.962-967, Nov. 90.Google Scholar
  2. [2]
    D. Sallaerts, D. Rabaey, A. Vanwetsenaers and M. Rahier, “A 270 kbit/s 35mW Modulator IC for GSM Cellular Radio Hand-held Terminals,” Proc. ISSCC, pp.34-35, Feb. 90.Google Scholar
  3. [3]
    D. Rabaey and J. Sevenhans, “The challenges for analog circuit design in Mobile radio VLSI chips,” Proceedings AACD (Leuven), pp.225-236, March 93.Google Scholar
  4. [4]
    P. Baltus, A. Tombeur, “DECT Zero-IF Receiver Front End,” Proceedings AACD (Leuven), pp.295-318, March 93.Google Scholar
  5. [5]
    K. Sam Shanmugan, Digital and Analog Communication Systems, pp.277–297, New York: J. Wiley & Sons, 1979Google Scholar
  6. [6]
    Yun-Ti Wang and A.A. Abidi, “CMOS Active Filter Design at Very High Frequencies,” IEEE J. of Solid-State Circuits, pp.1562-1574, Dec. 90.Google Scholar
  7. [7]
    G. Groenewold, “The Design of High Dynamic Range Continuous-Time Integratable Bandpass Filters,” IEEE Trans. on Circuits and Systems, pp.838-852, Aug. 91.Google Scholar
  8. [8]
    J.O. Voorman, “Continuous-Time Analog Integrated Filters,” in Integrated Continuous-Time Filters, pp.27–29, New York: IEEE press, 1993.Google Scholar
  9. [9]
    G.L. Haviland and A.A. Tuszynski, “A CORDIC Arithmetic Processor Chip,” IEEE J. of Solid-State Circuits, pp.4-14, Feb. 80.Google Scholar
  10. [10]
    N. Boutin, “Complex Signals,” RF-design, pp.27-33, Dec. 89.Google Scholar
  11. [11]
    R.A. Brown, R.J. Dewey and C.J. Collier, “An Investigation of the Limitations in a Direct Conversion Radio on FM-Reception,” Int. Conf. on Land Mobile Radio, pp.157-164, Dec. 85.Google Scholar
  12. [12]
    J.O. Voorman, “Asymmetric polyphase filter,” US Patent 4,914,408,1990.Google Scholar
  13. [13]
    K. Halonen, W. Sansen and M. Steyaert, “A Micropower Fourth-Order Elliptical Switched-Capacitor Low-pass Filter”, IEEE J. of Solid-State Circuits, pp.164-173, April 87.Google Scholar
  14. [14]
    J. Silva-Martinez, M. Steyaert and W. Sansen, “Design Techniques for High-Performance Full-CMOS OTA-RC Continuous-Time Filters”, IEEE J. of Solid-State Circuits, pp.993-1001, July 92.Google Scholar
  15. [15]
    J. Van Der Plas, “MOSFET-C Filter with Low Excess Noise and Accurate Automatic Tuning,” IEEE J. of Solid-State Circuits, pp.922-929, July 91.Google Scholar
  16. [16]
    A.M. Durham, J.B. Hughes and W. Redman-White, “Circuit Architectures for High Linearity Monolithic Continuous-Time Filtering,” IEEE Trans. on Circuits and Systems, pp.651-657, Sept. 92.Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Michiel Steyaert
    • 1
  • Jan Crols
    • 1
  1. 1.K.U. Leuven, ESAT-MICASHeverleeBelgium

Personalised recommendations