Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2007-03-07
2008-12-23
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C330S069000
Reexamination Certificate
active
07468635
ABSTRACT:
A method and apparatus for single-to-differential conversion includes a single-to-differential stage (22), a phase balancing stage (24), and a buffer stage (26). The single-to-differential stage (22) converts a single input signal (Vclk) to a first and second output signal (Vn, Vp), where the first and second output signals (Vn, Vp) correspond to one another. The phase balancing stage (24) is electrically connected to the single-to-differential stage (22), balances and receives the first and second output signals (Vn, Vp), and outputs first and second balanced output signals (V+, V−). The buffer stage (26) is electrically connected to the phase balancing stage (24) for shaping the first and second balanced output signals (V+, V−). The single-to-differential converter (20) is operable over a substantially large bandwidth and achieves low-power consumption and good phase noise performance.
REFERENCES:
patent: 6400224 (2002-06-01), Gharpurey
patent: 7126419 (2006-10-01), Miyasita
patent: 7279982 (2007-10-01), Zhou et al.
Choe Henry K
Motorola Inc.
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