Three-phase mixer-systems

Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals

Reexamination Certificate

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C455S333000

Reexamination Certificate

active

10538103

ABSTRACT:
Mixer-systems for up/down-converting frequencies comprise many components: in case of balanced quadrature conversion, some parts will show a fourfold repetition (insight). By creating a three-phase mixer-system (10,40), less components will be necessary (basic idea). The sub-signals in the group of sub-signals at the sub-outputs have phase differences being present between two subsequent sub-signals within an interval of 100–140 degrees, which makes these sub-signals already (substantially) balanced. In case of said phase differences being each within an interval of 118–122 degrees, the sub-signals are even better balanced, and when being 120 degrees, the sub-signals are perfectly balanced. A group of transistors (11–13,14–16,17–19,41–43,44–46,47–49) per sub-input (1,2,3) switches and/or amplifies the sub-signals at the sub-inputs. In an active mixer-system (10), said groups of transistors (11–13,14–16,17–19) are switched by further transistors (20–22). In a passive mixer-system (40) said groups of transistors (41–49) are in dependence of the group of sub-signals at the further sub-inputs (4,5,6) switched from low/high to high/low impedance.

REFERENCES:
patent: 5483695 (1996-01-01), Pardoen
patent: 5708383 (1998-01-01), Lee
patent: 7078969 (2006-07-01), Bhattacharjee et al.
patent: WO 98/45942 (1998-10-01), None
“CMOS Mixers and Polyphase Filters for Large Image Rejection ”, by Farbod Behbahani et al, IEEE Journal of Solid-State Circuits, vol. 36, No. 6, Jun. 2001.

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