| US 7,545,855 B2 | ||
| Phase shifter and current mode mixer | ||
| Ali Afsahi, San Diego, Calif. (US); and Arya Reza Behzad, Poway, Calif. (US) | ||
| Assigned to Broadcom Corporation, Irvine, Calif. (US) | ||
| Filed on Sep. 12, 2005, as Appl. No. 11/224,609. | ||
| Claims priority of provisional application 60/715365, filed on Sep. 08, 2005. | ||
| Prior Publication US 2007/0058747 A1, Mar. 15, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04B 1/38 (2006.01) | ||
| U.S. Cl. 375—219 [455/73; 710/1] | 19 Claims |
| 15. A method for phase and frequency shifting an ingoing RF communication signal, comprising:
receiving non-phase-aligned multi-path signal components of an ingoing communication signal;
phase shifting non-phase-aligned multi-path signal components to produce phase-aligned signal current components in the form
of phase shifted current signals;
summing the phase shifted current signals to produce an ingoing current signal;
producing the ingoing current signal to a mixer; and
mixing the ingoing current signal with a local oscillation to produce a phase and frequency shifted ingoing signal.
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