A precision bipolar 5-6GHz band quadrature-phase generator

A wideband bipolar doubler and high-sensitivity regenerative divider with precise I-Q phase tuning via a dc bias control are described. Measurements in the 5-6GHz band demonstrate that negligible residual phase noise is added by the circuit, which has an active area of just 0.26/spl times/0.11mm/sup 2/, consumes 23mW at 2.7V and has a simulated phase tuning range of /spl plusmn/22/spl deg/ with 0.04/spl deg//mV sensitivity.

[1]  J. Maligeorgos,et al.  A 2 V 5.1-5.8 GHz image-reject receiver with wide dynamic range , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[2]  J.R. Long,et al.  A low-voltage 5.1-5.8-GHz image-reject receiver with wide dynamic range , 2000, IEEE Journal of Solid-State Circuits.

[3]  K. Kimura.  A bipolar four-quadrant analog quarter-square multiplier consisting of unbalanced emitter-coupled pairs and expansions of its input ranges , 1994 .

[4]  M. Steyaert,et al.  An analog integrated polyphase filter for a high performance low-IF receiver , 1995, Digest of Technical Papers., Symposium on VLSI Circuits..