Back to results
US 5,295,186 AGranted
Termination circuit for a two-wire transmission line
AssigneeNEC Corporation
InventorToshiyuki Okamoto
Life of this patent
Estimating the term…
Abstract
A low-pass filter is inserted between a two-wire line and a four-wire transmitting line for transmitting a transmission signal supplied from the two-wire line. Input and output signals of the low-pass filter are fedback to a subtracter to provide a subtracted signal which is added to an output signal of a terminal impedance resultant filter. Thus, operation is realized in a stable manner even in a high frequency band, in which an output signal of the low-pass filter is rotated in phase by 180.degree..
Claims3
A termination circuit for a two-wire transmission line, comprising:
- a low-pass filter connected in series to a four-wire transmitting line for transmitting a signal supplied from a two-wire transmission line;
- a serial connection of first to third adders and a reference resistance connected to a four-wire receiving line for supplying a receipt signal to said two-wire transmission line;
- a terminal impedance resultant filter including a switched capacitor and having an input terminal connected to an output terminal of said low-pass filter and an output terminal connected to an input terminal of said first adder;
- first and second feedback lines having first and second feedback amounts and connected to an input terminal and an output terminal of said low-pass filter, respectively;
- a subtractor having first and second input terminals connected to said first and second feedback lines, respectively and an output terminal connected to said second adder;
- and
- a third feedback line having one end connected to said input terminal of said low-pass filter.
4 more elements
Dependencies are inferred from the claim text.