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  2. Driven right leg circuit - Wikipedia

    en.wikipedia.org/wiki/Driven_right_leg_circuit

    A Driven Right Leg circuit or DRL circuit, also known as Right Leg Driving technique, is an electric circuit that is often added to biological signal amplifiers to reduce common-mode interference. Biological signal amplifiers such as ECG ( electrocardiogram ) EEG ( electroencephalogram ) or EMG circuits measure very small electrical signals ...

  3. Bioamplifier - Wikipedia

    en.wikipedia.org/wiki/Bioamplifier

    The amplitude of ECG ranges from 0.3 to 2 mV for the QRS complex, which is used to determine the interbeat interval from which the frequency is derived. The typical requirements for the amplifiers to be used in ECG include: [1] Low internal noise (<2 mV) High Input Impedance (Z in > 10 MΩ) Bandwidth ranging from 0.16–250 Hz

  4. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    ECG voltages measured across the body are very small. This low voltage necessitates a low noise circuit, instrumentation amplifiers, and electromagnetic shielding. Simultaneous lead recordings: earlier designs recorded each lead sequentially, but current models record multiple leads simultaneously.

  5. Blackmer gain cell - Wikipedia

    en.wikipedia.org/wiki/Blackmer_gain_cell

    The Blackmer gain cell is an audio frequency voltage-controlled amplifier (VCA) circuit with an exponential control law. It was invented and patented by David E. Blackmer between 1970 and 1973. The four- transistor core of the original Blackmer cell contains two complementary bipolar current mirrors that perform log-antilog operations on input ...

  6. Isolation amplifier - Wikipedia

    en.wikipedia.org/wiki/Isolation_amplifier

    The capacity of an isolation amplifier is a function of two key isolation amplifier specifications: The amplifier’s isolation breakdown voltage, which defines the absolute maximum common mode voltage that it will tolerate without damage. Specifications of 1,000 volts and more are common. The amplifier’s common mode rejection ratio (CMRR ...

  7. Bioinstrumentation - Wikipedia

    en.wikipedia.org/wiki/Bioinstrumentation

    A commonly used amplifier is the instrumentation amplifier. Instrumentation amplifiers such as the integrated circuit (IC) AD620 amplifier are able to amplify the difference between two different voltage inputs while maintaining little offset voltage and a high CMRR, allowing it to amplify low frequency signals while rejecting noise. [31]

  8. Analog Devices - Wikipedia

    en.wikipedia.org/wiki/Analog_Devices

    Paul Brokaw is an expert on integrated circuit design who has spent most of his career at Analog Devices, where he holds the position of Analog Fellow. [38] Brokaw is the inventor of many analog IC circuits, including the Brokaw bandgap reference and holds over 100 patents. [39] He is also an IEEE Life Fellow. [40]

  9. Asymptotic gain model - Wikipedia

    en.wikipedia.org/wiki/Asymptotic_gain_model

    In what follows, the output variable is selected as the short-circuit current of the amplifier, that is, the collector current of the output transistor. Other choices for output are discussed later. To implement the asymptotic gain model, the dependent source associated with either transistor can be used.