Apparatus for filtering a reference voltage and mobile...

Details Apparatus for filtering a reference voltage and mobile... Apparatus for filtering a reference voltage and mobile...

2011-03-22

2011-03-22

Nguyen, Duc (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S091000, C455S212000, C455S332000, C455S342000

Reexamination Certificate

active

07912440

ABSTRACT:
Apparatus (40) comprising a voltage input (49) for applying an unfiltered voltage (V_unfil) and a current input (48) for receiving a bias current (Ib) from a current source. The apparatus (40) further comprises a differential filtering resistive circuit with a first current mirror (44) and a second current mirror (43), being situated between a common output node (50) and said voltage input (49). A first mirror circuit (42) for mirroring the bias current (Ib) to said first current mirror (44), and a second mirror circuit (41) for mirroring a current (Ix) to said second current mirror (43) are employed. A filter capacitor (51) situated at the output side of the apparatus (40), said filter capacitor (51) being connected on one side to said common output node (50) and on the other side to ground. The apparatus (40) provides a filtered output voltage (V_fil) at said common output node (50).

REFERENCES:
patent: 6657481 (2003-12-01), Rasmussen et al.
patent: 7031689 (2006-04-01), Frank
patent: 7551901 (2009-06-01), Khorram
patent: 2001/0045850 (2001-11-01), Kuroda
patent: 2002/0084840 (2002-07-01), Tsuchi
patent: 2003/0234680 (2003-12-01), Erckert

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