Invention Grant
- Patent Title: Active crystal filter with a transfer function of a wanted degree
- Patent Title (中): 具有传输功能的主动晶体滤波器
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Application No.: US3568082DApplication Date: 1968-09-03
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Publication No.: US3568082APublication Date: 1971-03-02
- Inventor: FJALLBRANT TORE TORSTENSSON
- Applicant: ERICSSON TELEFON AB L M
- Assignee: Ericsson Telefon Ab L M
- Current Assignee: Ericsson Telefon Ab L M
- Priority: SE1252667 1967-09-11
- Main IPC: H03H9/54
- IPC: H03H9/54 ; H03H11/04 ; H03F3/04
Abstract:
An active band pass filter includes a plurality of serially connected crystals which connect the input of the filter to an emitter-follower amplifier. A first plurality of resistors connected at alternate junctions of the crystals to the output of the amplifier and a second plurality of resistors connect the remaining junctions of the crystals to a signal level means which has a level different from the output of the amplifier.
Information query
IPC分类:
