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A wideband feedback compensated quadrature generator

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2 Author(s)
Gideon S. K. Yong ; Department of Electrical and Computer Engineering, Queen's University, Kingston, Ontario, Canada, K7L 3N6 ; Carlos E. Saavedra

A novel quadrature generator is presented in this paper that exhibits a 40% operating frequency bandwidth. Current circuits do not generally provide quadrature signals over such a wide fractional bandwidth and they are often susceptible to variances in component values, which can shift their operating frequency. In this work, this is resolved with the use of a negative feedback network including a pair of phase shifters and two variable gain amplifiers to actively compensate the imbalances over a large frequency range. Experimental results show a 2 GHz bandwidth centered at 5 GHz while maintaining a phase error below 8deg and less than 1.5 dB in amplitude error. The circuit, without bonding pads, uses an area of only 0.28 mm2.

Published in:

Sarnoff Symposium, 2009. SARNOFF '09. IEEE

Date of Conference:

March 30 2009-April 1 2009