Low noise filter for a wireless receiver

Details Low noise filter for a wireless receiver Low noise filter for a wireless receiver

2004-09-25

2008-08-19

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S307000, C455S324000

Reexamination Certificate

active

07415264

ABSTRACT:
A low noise filter is arranged to receive an input signal from a downconverter. The low noise filter is constructed to block or cancel any DC offset in the input signal, as well as filter selected frequency components from the input signal. The low noise filter uses a shared capacitor both to handle the DC offset and to set filter response characteristics. As the low noise filter is implemented with a Frequency Dependent Negative Resistance (FDNR) device, the shared capacitor may be relatively small. The low noise filter has a load capacitor, with the output of the load capacitor coupled to a bias resistor and voltage. This bias structure cooperates with the load capacitor to set a high cutoff frequency for the low noise filter useful for blocking or canceling the DC offset.

REFERENCES:
patent: 4185250 (1980-01-01), Regan
patent: 5854421 (1998-12-01), Yamamoto
patent: 2002/0160734 (2002-10-01), Li et al.
patent: 2004/0043744 (2004-03-01), Schlegel et al.
Zoran Skrba and Thomas J. Brazil; System Level Modelling of Wireless Communication Systems Using A Power Amplifier Behavioural Model; Joint IEI/IEEE Symposium on Telecommunication Research; Nov. 27, 2001; pp. 1-7.
Massara, R.E. Steadman, J.W., Wilamowski, B.M., Svoboda, J.A.,; Active Filters; The Electical Engineering Handbook; Boca Raton: CRC Press LLC, 2000; Chapter 29.

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