Receiver IF system with active filters

Details Receiver IF system with active filters Receiver IF system with active filters

1997-02-25

1998-12-22

Le, Thanh Cong

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

4552341, 455302, 455307, H04B 126

Patent

active

058527729

ABSTRACT:
A high dynamic range receiver IF system using limited dynamic range IF filters is disclosed. A variable gain amplifier amplifies a first IF signal. The amplified first IF signal is then applied to an image suppression mixer for suppressing an image component of the amplified first IF signal to provide adequate image suppression for a radio system, wherein the image suppression mixer outputting an image suppressed second IF signal. An active bandpass filter then filters the unwanted components from the second IF signal. The filtered signal is then hard limited in a limiting amplifier which outputs a limited IF signal. A logarithmic detector then provides a received signal strength indicator.

REFERENCES:
patent: 4186351 (1980-01-01), Thro
patent: 4531235 (1985-07-01), Brusen
patent: 4619002 (1986-10-01), Brefini
patent: 5241702 (1993-08-01), Dent
patent: 5361404 (1994-11-01), Dent
Tsividis, "Integrated Continuous-Time Filter Design- An Overview," IEEE Journal of Solid-State Circuits, vol. 29, No. 3, Mar. 1994, pp. 166-176.
Groenewold, "The Design of High Dynamic Range Continuous-Time Integratable Bandpass Filters," IEEE Transactions on Circuits and Systems, vol. 38, No. 8, Aug. 1991, pp. 838-852.

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