Switched capacitor elliptic filter

Details Switched capacitor elliptic filter Switched capacitor elliptic filter

1978-09-08

1979-12-18

Dahl, Lawrence J.

Amplifiers

Signal feedback

Phase shift means in loop path

328167, 330109, 333173, H03F 136

Patent

active

041796659

ABSTRACT:
A switched capacitor sampled data elliptic filter for data transmission or communication systems is disclosed. The filter section comprises three integrating operational amplifiers connected in series with a negative feedback connection between the output of the second operational amplifier and the input to the first operational amplifier, which is also connected to the input voltage source. Signals via a feed forward connection from the input voltage source and the outputs of the first and second operational amplifiers are summed by the third operational amplifier. Switched capacitors in the feed forward connection, the negative feedback connection, the inputs to all three operational amplifiers and in feedback sections of the first and third operational amplifiers are all connected to a two-phase clock driver operated at a preselected frequency. The circuit arrangement realizes finite transmission zeros in the transfer function which produce a sharp transition from pass band to stop band with a lower order, and the values of all capacitors may be calculated to provide the filter with a loss response within preselected limits.

REFERENCES:
Delagrange-- "FETs in RC Network Tune Active Filter" -- Electronics, 12/1970, p. 76.

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