An EDGE transmitter with mitigation of oscillator pulling

Author

Bashir, Imran ; Staszewski, R. Bogdan ; Eliezer, Oren ; Waheed, Khurram ; Zoicas, Vasile ; Tal, Nir ; Mehta, Jaimin ; Lee, Meng-Chang ; Balsara, Poras T. ; Banerjee, Bhaskar

Author_Institution

Univ. of Texas at Dallas, Richardson, TX, USA

fYear

2010

fDate

23-25 May 2010

Firstpage

13

Lastpage

16

Abstract

We propose a polar transmitter architecture that is robust to modulation-induced injection pulling of its RF oscillator by means of a built-in self compensation. A mathematical model is presented for the injection pulling mechanism, which incorporates a digitally-controlled delay circuit that minimizes injection pulling by adjusting the overall phase shift in the parasitic path between the final amplitude modulation stage (aggressor) and the RF oscillator (victim). The technique is verified in a 65-nm CMOS GSM/GPRS/EDGE SoC demonstrating compliant error vector magnitude (EVM) and modulation spectral-mask performance over process and temperature.

Keywords

3G mobile communication; CMOS integrated circuits; amplitude modulation; delay circuits; digital control; packet radio networks; radio transmitters; radiofrequency oscillators; CMOS; EDGE transmitter; GPRS; GSM; RF oscillator; SoC; amplitude modulation stage; built-in self compensation; digitally-controlled delay circuit; error vector magnitude; mathematical model; modulation spectral-mask performance; modulation-induced injection pulling; oscillator pulling mitigation; polar transmitter architecture; Amplitude modulation; CMOS process; Circuits; Delay; GSM; Mathematical model; Oscillators; Radio frequency; Robustness; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium (RFIC), 2010 IEEE

Conference_Location

Anaheim, CA

ISSN

1529-2517

Print_ISBN

978-1-4244-6240-7

Type

conf

DOI

10.1109/RFIC.2010.5477247

Filename

5477247