Variable loop length compensated barrier circuit

Details Variable loop length compensated barrier circuit Variable loop length compensated barrier circuit

1979-01-31

1980-10-14

Moffitt, James W.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

179170R, 250551, 307311, 455602, H04B 900

Patent

active

042283230

ABSTRACT:
A gain and frequency compensated barrier circuit is disclosed for use with a telephone transmission line having variable loop lengths. A DC component of the input signal is provided to the input side of the barrier circuit. Loop length losses, as well as barrier gain variations, are adjusted on the output side of the circuit by comparing a barrier DC voltage level with a DC reference level and adjusting the AC gain in accordance therewith. Frequency response, which is also a function of loop length, is corrected by using the DC input voltage to generate an effective loop length dependent capacitor for further controlling the output signal level. An optocoupled circuit is disclosed for use in one embodiment of the disclosure.

REFERENCES:
patent: 3504127 (1970-03-01), Slana
patent: 3772514 (1973-11-01), Sunderland
patent: 3952205 (1976-04-01), Tobey, Jr. et al.
patent: 3991279 (1976-11-01), Morgan
patent: 4032843 (1977-06-01), Loucks
patent: 4045615 (1977-08-01), James
patent: 4056719 (1977-11-01), Waaben
patent: 4070572 (1978-01-01), Summerhayes

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