Wireless receiving circuit and wireless portable device

Details Wireless receiving circuit and wireless portable device Wireless receiving circuit and wireless portable device

2008-03-18

2008-03-18

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S323000, C455S339000

Reexamination Certificate

active

07346327

ABSTRACT:
A wireless receiving circuit includes a mixer, a buffer, an active low-pass filter, and a second order passive low-pass filter which are connected between a signal input terminal and a signal output terminal. The second order passive low-pass filter is for removing an interfering wave that cannot be removed by the active low-pass filter. In the wireless receiving circuit, a first capacitor and a second capacitor are provided. The first capacitor has one terminal connected to an input terminal of the buffer and the other terminal grounded. The second capacitor has one terminal connected to an output terminal of the buffer and the other terminal grounded. These two kinds of capacitors function as the second order passive low-pass filter by being combined with input and output impedance of elements provided on the upstream side and downstream side of the capacitors. Thus provided are (i) a wireless receiving circuit that can be integrated into an integrated circuit, can reduce power consumption, and can be designed easily, and (ii) a wireless portable device using the wireless receiving circuit.

REFERENCES:
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patent: 5999802 (1999-12-01), Aschwanden
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patent: 7236762 (2007-06-01), Asikainen et al.
patent: 2002/0081990 (2002-06-01), Asikainen et al.
patent: 1 081 871 (2001-07-01), None

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