http://iet.metastore.ingenta.com
1887

Manchester encoded bandpass sigma–delta modulation for RF class D amplifiers

Manchester encoded bandpass sigma–delta modulation for RF class D amplifiers

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IET Circuits, Devices & Systems — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

An analysis of a continuous-time bandpass sigma–delta modulator in a configuration with an upconverter is given for a RF class D amplifier application. The upconverter multiplies the modulator pulse train with a synchronised clock signal and maps each modulator bit to an integer multiple k of a (+1, −1) or (−1, +1) pattern depending on the sign of the modulator bit. The upconversion is equivalent to an extension of Manchester encoding, which is usually defined for k=1. The analysis focuses on evaluating the impact of upconversion on the modulator coding efficiency and the average pulse period. A design equation is derived, which shows that coding efficiency is dependent only on the upconversion frequency ratio, while the average pulse period depends only on k. The equations provide a designer with a way of evaluating the trade-offs in the amplifier system and show that encoding with k=1 is the most efficient configuration for maximising coding efficiency and minimising switching power loss.

References

    1. 1)
    2. 2)
      • Johnson, T., Stapleton, S.: `Available load power in a RF class D amplifier with a sigma-delta modulator driver', Proc. IEEE Radio and Wireless Conf., September 2004, Atlanta, GA, USA, p. 439–442.
    3. 3)
      • Wagh, P., Midya, P., Rakers, P., Caldwell, J., Schooler, T.: `An all-digital universal RF transmitter', Proc IEEE Custom Integrated Circuits Conf., October 2004, Orlando, FL, USA, p. 549–552.
    4. 4)
      • Shoaei, O., Snelgrove, W.M.: `Optimal (bandpass) continuous-time ΣΔ modulator', Proc IEEE Int. Symp. on Circuits and Systems, 30 May–2 June 1994, London, UK, 5, p. 489–492.
    5. 5)
      • Thurston, A., Pearce, T.H., Hawksford, M.J.: `Bandpass implementation of the sigma-delta A-D conversion technique', Proc. IEE Int. Conf. on Analogue to Digital and Digital to Analogue Conversion, September 1991, Swansea, UK, p. 81–86.
    6. 6)
    7. 7)
      • Thomas, K., Rana, R.S., Yong, L.: `A 1 GHz CMOS fourth-order continuous-time bandpass sigma delta modulator for RF receiver front end A/D conversion', Proc. Asia and South Pacific Design Automation Conf. (ASP-DAC), January 2005, Shanghai, People's Republic of China, 2.
    8. 8)
      • H. Tao , J.M. Khoury . A 400-ms/s frequency translating bandpass sigma-delta modulator. IEEE Trans. Circuits Syst. I, Fundam. Theory Appl. , 12 , 665 - 670
    9. 9)
    10. 10)
    11. 11)
    12. 12)
      • Johnson, T., Stapleton, S., Cavers, J.: `Binary coding for RF class D amplifier applications', Proc. Ninth Canadian Workshop on Information Theory, June 2005, Montréal, Québec, Canada, p. 74–77.
    13. 13)
      • H.L. Kraus , C.W. Bostian , F.H. Raab . (1980) Solid-state radio engineering.
    14. 14)
      • S.C. Cripps . (1999) RF power amplifiers for wireless communications.
    15. 15)
      • L.W. Couch . (1997) Digital and analog communication systems.
    16. 16)
      • A. Papoulis . (1965) Probability, random variables, and stochastic processes.
    17. 17)
    18. 18)
      • H.F. Davis . (1963) Fourier series and orthogonal functions.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds_20060054
Loading

Related content

content/journals/10.1049/iet-cds_20060054
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address