Receiver for differential signals with means for adjusting a floating ground state
First Claim
Patent Images
1. A receiver for differentially detecting biological signals from a patient via first and second electrode contact points, comprising:
- first circuit means connected to said first electrode contact point and having an output;
second circuit means connected to said second electrode contact point and having an output;
differential amplifier means connected to each said output from said first circuit means and said second circuit means;
a first controllable current source connected between said first circuit means and a source of reference potential;
a second controllable current source connected between said second circuit means and a source of reference potential; and
summing means coupled to said first and second circuit means and responsive to common mode signals appearing thereon for providing control signals to said first and second controllable current sources, said control signals causing said first and second controllable current sources to inject currents into said first and second circuit means to bring the patient'"'"'s potential to a predetermined balanced level with respect to said common mode signals.
4 Assignments
0 Petitions
Accused Products
Abstract
A receiver or preamplifier for differential signals, in particular electrocardiogram signals, includes n electrodes to provide at least one signal at an acceptable common mode rejection ratio, even if the subject to which the electrodes are applied has a different ground potential than the assigned monitor. This is achieved by two current sources which are controlled by a sum signal representing a sum of the electrode signals, said current sources injecting a corresponding current into the electrodes.
35 Citations
11 Claims
-
1. A receiver for differentially detecting biological signals from a patient via first and second electrode contact points, comprising:
-
first circuit means connected to said first electrode contact point and having an output; second circuit means connected to said second electrode contact point and having an output; differential amplifier means connected to each said output from said first circuit means and said second circuit means; a first controllable current source connected between said first circuit means and a source of reference potential; a second controllable current source connected between said second circuit means and a source of reference potential; and summing means coupled to said first and second circuit means and responsive to common mode signals appearing thereon for providing control signals to said first and second controllable current sources, said control signals causing said first and second controllable current sources to inject currents into said first and second circuit means to bring the patient'"'"'s potential to a predetermined balanced level with respect to said common mode signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification