Differential input stage for electronic equipment, comprising means for reducing interference caused by a voltage or current in common mode
A technology of differential input, electronic equipment, applied in the direction of current supply device, differential amplifier, DC-coupled DC amplifier, etc., can solve the problems of phase delay, affecting the effect of feedback, etc.
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[0021] figure 1 The given embodiment is for the user card input-output stage. it includes:
[0022] Two circuit connections A and B, connectable to subscriber lines;
[0023] Two output circuit connectors a and b are connected to the input ends of the amplifiers AMP2 and AMP3 on the user card;
[0024] Two input circuit connectors c and d, connected to the output terminals of the respective amplifiers AMP1 and AMP4 on the user card, and respectively connected to the input-output circuit connectors A and B;
[0025] A bridge comprising two equal impedance resistors R1 and R2 between circuit connections A and B;
[0026] Inverter I3, the input of which is connected to the midpoint of bridge R1R2;
[0027] an adder S3 having one input connected to circuit connections c and A, one input connected to the output of inverter I3, and the output connected to output circuit connection a; and
[0028] The adder S4 has one input connected to the circuit connections d and B, one input...
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