Modular low voltage filter with common mode feedback

Details Modular low voltage filter with common mode feedback Modular low voltage filter with common mode feedback

1993-08-02

1994-09-06

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330303, H03F 345

Patent

active

053451902

ABSTRACT:
A modular filter (11) that operates at low voltages and utilizes common mode feedback is described. The modular filter (11) receives an input differential signal and provides a filtered output differential signal. The modular filter (11) comprises a load circuit (15) , a first transconductor (18) , a second transconductor (24) , an amplifier (19), and a common mode amplifier (26). The first transconductor (18) has a transconductance gml and the second transconductor (24) has a transconductance g.sub.m2. The amplifier has a gain K. The modular filter (11) provides a transfer function of V.sub.o /V.sub.i =(g.sub.m1 /g.sub.m2)*((1+(sKC.sub.a /g.sub.m1))/(1+(s (C.sub.a +C.sub.b)/g.sub.m2)), where C.sub.a are capacitors (21 and 22) that capacitively couple outputs of the amplifier (19) to the load circuit (15) and C.sub.b are capacitors (27 and 28) that capacitively couples the output of the common mode amplifier (26) to the load circuit (15). The common mode amplifier (26) controls loading provided by the load circuit (15).

REFERENCES:
patent: 3845404 (1974-10-01), Trilling
patent: 4780690 (1988-10-01), Voorman
patent: 4820998 (1989-04-01), Roessler
patent: 4904953 (1990-02-01), McCormack
Geert A. DeVeirman et al., "Monolithic 10-30 MHz Tunable Bipolar Bessel Lowpass Filter", IEEE Proc. ISCAS, pp. 1444-1447, 1991, Paper 7-D.2.

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