Design Considerations for a Direct RF Sampling Mixer

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 54; no. 11; pp. 934 - 938
• Main Authors: Dianyong Chen, Wei Wang, Kwasniewski, T.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analog-digital conversion; Charge; Charge sharing; Circuits; Design engineering; embedded filtering; Mixers; Noise; Noise figure; Nonlinearity; Radio frequencies; Radio frequency; Receivers; RF signals; Sampling; Sampling methods; sampling mixer; Signal sampling; Switches; Voltage; windowed integration sampler; Charge sharing; embedded filtering; noise; windowed integration sampler; sampling mixer; nonlinearity
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2007.902063

This brief presents a detailed time-domain and frequency-domain analysis of a direct RF sampling mixer. Design considerations such as incomplete charge sharing and large signal nonlinearity are addressed. An accurate frequency-domain transfer function is derived. Estimation of noise figure is given. The analysis applies to the design of sub-sampling mixers that have become important for software-defined radio and analog-to-digital converter.