Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-12-03
1984-10-23
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330297, H03F 345
Patent
active
044790937
ABSTRACT:
An amplifier (10) is disclosed including circuity for improving the amplifiers performance, particularly the common mode rejection of differential amplifiers, by adding the amplifier input signal to the power supply signals which power the amplifier. Voltage dividers (42, 44) are connected between the amplifier output (16) and each of the two power supply rails (26, 28). Each divider includes resistors (46, 48; 50, 52) selected so that the amplifier output is divided down by a factor equal to the gain of the amplifier. The junction signals (V.sub.J1, V.sub.J2) provided by the two voltage dividers thus each includes a component equal to the input signal. The junction voltages are applied to the amplifier power input terminals (18, 20) by respective transistors (60, 62), each connected in a voltage follower arrangement. One embodiment (FIG. 4) incorporates a servo amplifier (100) for DC offset stabilization. Impedances (104, 106) couple the output of the servo amplifier to the voltage dividers so that no loss in common mode rejection results from servo operation.
REFERENCES:
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Gagne et al., IEEE Trans. on Biomedical Engineering, Jan., 1976, pp. 81-83.
Bergveld, "Alternative Design of a Unity-Gain Follower with Buffer", IEEE Trans. on Biomedical Engineering V. BME-25, No. 6, Nov. 1978, pp. 567-568.
Garde, "Schemes for Increased Output-Voltage Swing from Operational Amplifiers" Electronics Letters, V. 13, No. 4, pp. 111-112, Feb. 17, 1977.
Younge, "Bootstrapping Bias Supply Increases IC Voltable Capacity", Electronics, V. 41, No. 22, Oct., 1968 pp. 90, 91.
Ride, "Increased Output Voltage for Op-Amps," Wireless World, Oct. 1977, p. 64.
Inventab Audio Kb
Mullins James B.
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