Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2007-05-08
2009-08-25
Zweizig, Jeffrey S (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
Reexamination Certificate
active
07579891
ABSTRACT:
The invention relates to the generation of an electric output signal with a specified frequency and a phase (P) dependent upon a control signal (x) by means of weighted superposition of several input signals (s1, s2, s1*, s2*), which have the specified frequency but different input signals phases, whereby the weighted superposition is applied to a parallel switching of adjustable transconductance stages which are each adjusted by the control signal (x) and to each of which one of the input signals (s1, s2, s1*, s2*) is supplied. In order to be able to use this so-called phase interpolation to meet higher linearity requirements, the invention provides that for the generation of the output signal with a phase which lies between a first input signal phase (0°) of a first input signal (s1) and a second input signal phase (120°) of a second input signal (s2) which second phase is larger by a phase difference (120°), the first input signal (s1) and the second input signal (s2) and two further input signals (s1*1, s2*1and S1*2, s2*2resp.) are superimposed in a weighted fashion, whereby the two further input signals (s1*1, s2*1and S1*2, s2*2resp.) have phases different by the phase difference (120°) and are phase-shifted by one half (60°) of the phase difference with regard to the first and second input signals (s1, s2).
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patent: 7298195 (2007-11-01), Freyman et al.
patent: 2003/0002607 (2003-01-01), Mooney et al.
patent: 0 909 035 (1999-04-01), None
Yueming Jiang and Alessandro Piovaccari, “A compact phase interpolator for 3.125G Serdes Application”, SSMSD 2003, IEEE, pp. 249-252, 2003.
National Semiconductor Germany AG
Pearne & Gordon LLP
Zweizig Jeffrey S
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