Title :
High pass filter implementation comparison in unity STF high pass ΔΣ modulator
Author :
Nguyen, Van Tam ; Khushk, Hasham Ahmed ; Jabbour, Chadi ; Loumeau, Patrick
Author_Institution :
Inst. TELECOM-TELECOM, ParisTech, Paris, France
Abstract :
High-pass (HP) delta-sigma (ΔΣ) modulators enjoy superiority over low-pass (LP) ΔΣ modulators because of their inherent immunity to low-frequency noise. HP filter is a major building block of HP ΔΣ modulator. This article presents three state of the art HP filters accompanied by their detailed comparative analysis. They are compared on the basis of switch noise, Operational Transconductance Amplifier (OTA) noise and OTA finite dc-gain, finite gain-bandwidth product (GBW) and finite slew rate (SR). This in-depth analysis is validated by simulation results and proves that the improved structure provides superior performance than the other two HP filter implementations. It achieves better noise immunity and relaxes the OTA requirements.
Keywords :
delta-sigma modulation; high-pass filters; operational amplifiers; HP filter Implementation; LP ΔΣ modulator; OTA finite DC-gain; OTA noise; comparative analysis; finite GBW product; finite SR; finite gain-bandwidth product; finite slew rate; high pass filter implementation; in-depth analysis; low-frequency noise; low-pass ΔΣ modulator; operational transconductance amplifier noise; switch noise; unity STF HP delta-sigma modulator; unity STF high pass ΔΣ modulator; Capacitors; Frequency modulation; Noise; Passband; Strontium; Switches;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2011 18th IEEE International Conference on
Conference_Location :
Beirut
Print_ISBN :
978-1-4577-1845-8
Electronic_ISBN :
978-1-4577-1844-1
DOI :
10.1109/ICECS.2011.6122224
