Frequency selective variable gain amplifier

摘要: An amplifier for an electrocardiographic monitoring system. The band-pass of the is such that ordinarily all frequency components ECG signal are amplified to same extent. In presence a low noise which causes output voltage exceed maximum limit in either direction, 3-db. point raised from .05 Hertz 1.0 Hertz. This achieved simply by lowering time constant high pass filter amplifier. shorter reduces effect on voltage. While some attenuated, most usable information retained. also provides faster recovery following large direct current changes. especially beneficial when patient electrodes system switched and they induce charge DC component might saturate preamplifier. Similarly, signals lowered similar purpose.